Diluting mixture for hydraulic binder-based composition

FIELD: chemistry.

SUBSTANCE: present invention relates to a hydraulic composition which includes: at least one hydraulic binder, at least one first plasticising additive which includes at least one phosphonic-amino-alkylene group, at least one second plasticising additive which includes at least one polymer with a comb-like structure, wherein the weight concentration off the dry residue of the second additive is 25-100% of the weight concentration of the dry residue of the first additive. The invention also relates to concrete which includes said hydraulic composition and the composition of a diluting mixture for said hydraulic composition. The invention is developed in subclaims.

EFFECT: low viscosity of the hydraulic binder-based composition over the processability duration of the composition.

10 cl, 6 tbl, 2 dwg

 

The present invention relates to compositions with a base of hydraulic binder used to obtain parts and structures made of concrete. More specifically, the present invention relates to compositions with a base of hydraulic binder, which is mixed with at least one plasticizing additive. It represents, for example, concrete that includes hydraulic binder, mixed with a fine aggregate such as sand, and, optionally, coarse aggregate, for example, crushed stone.

When the components of the concrete mix with water, get a composition that sets and hardens in the reactions and processes of hydration and which, after hardening, retains its strength and its stability even under water. Before setting concrete treated for a limited period of time, usually called the time of workability. Pot life can be defined as the length of time during which RASPLAV or sludge cone cement composition is greater than the specified value.

The problem that needs to be taken into account in the manufacture of concrete, is the amount of water for mixing, which should be used. The amount of water for mixing should be sufficient to allow adobeelement with concrete. However, increasing the amount of water for mixing tends to reduce the compressive strength of the resulting concrete after hardening.

Concrete may include one or more additives called plasticizers or plasticizing additives, in order to obtain concrete with a satisfactory mobility during the time of workability without using excessive amounts of water.

Examples of plasticizing additives are the compounds described in the patent EP 0663892 filed on behalf of Chryso. They are compounds, including polyoxyalkylene chain and amino phosphonic-alkylenes group. Even although these supplements provide the opportunity to effectively reduce the viscosity of the concrete, to obtain the desired effects can be important dosage of these supplements in the concrete. This can be a disadvantage because the cost of obtaining these supplements is high. Moreover, these additives can cause a delay setting, which increases with the dosage of the additive.

The purpose of the present invention consists in the proposal of composition with a base of hydraulic binders, which has a pot life of at least 90 minutes, which has a reduced viscosity over time of workability and setting time is not too high.

To achieve this the spruce present invention provides a hydraulic composition, including:

at least one hydraulic binder;

at least one first plasticizing additive comprising at least one phosphonic amino-alkylenes group;

at least one second plasticizing additive comprising at least one polymer with a comb structure, and the concentration by weight of the dry residue of the second additive is from 25% to 100% of the concentration by weight of the dry residue of the first Supplement.

Preferably, the first dosage of the additive composition of the present invention is less than the dosage that should be used to obtain the same initial RASPLAV or the same precipitation cone, if used, only the first additive. In this way reduce the cost of obtaining the hydraulic composition. The present invention allows to simultaneously obtain:

- settling cone, similar to the sediment, which would be when it was used only the first additive;

- dosage thinning of the mixture in the hydraulic composition is distinctly smaller (in particular, more than 50%) compared to the dose that would be when it was used only the first additive;

the delay setting is distinctly smaller (in particular, more than 50%) compared to the delay setting, which floor is ilaci if, when it was used only the first additive;

viscosity is clearly less (in particular, more than 15%) compared to the viscosity, which would be when it was used only the first Supplement.

According to the present invention, the expression "hydraulic binder", you should understand how the powdered material which, when mixed with water forms a paste that sets and hardens in the reactions and processes of hydration and which, after hardening, retains its strength and its stability even under water. The expression "hydraulic composition" should be understood as any composition comprising a hydraulic binder. It represents, for example, concrete.

The term "concrete" should be understood as a mixture of a hydraulic binder, aggregates, water, and optional additives and optional mineral additives, such as concrete high quality, high quality concrete with high workability concrete with high workability, self-levelling concrete mixture, liquefied self-compacting concrete, fiber concrete, ready mixed concrete or colored concrete. The term "concrete" should also be understood as the concrete is subjected to final processing, such as concrete, treated bucardo, concrete mix with naked will fill the LEM or wash the concrete, or polished concrete. Under this definition should also understand prestressed concrete. The term "concrete" includes mortars, in this particular case, the concrete comprises a mixture of a hydraulic binder, sand, water, and optional additives and optional mineral supplements. The term "concrete" according to the invention denotes a vague freshly prepared concrete or hardened concrete.

According to the invention, the term "fillers" should be understood as gravel, coarse aggregate and/or sand.

According to the invention, the expression "mineral supplements" should be understood as fine mineral material used in concrete in order to improve certain properties or to give it specific properties. Examples of mineral additives are fly ash (as defined in the standard EN 450), fine silica dust (as defined in the standard prEN 13263: 1998 or standard NF P 18-502), slag (as defined in the standard NF P 18-516), limestone additives (as defined in the standard NF P 18-508) and silica additives (as defined in the standard NF P 18-509).

According to the present invention, the term "setting" should be understood as a transition to the solid state by chemical reaction of hydration of the binder. For setting usually follows a period of hardening.

According to the SNO present invention, the term "hardening" you should understand as the improvement of the mechanical properties of the hydraulic binder after the end of the seizure.

The expression "plasticizing additive" should be understood as an additive, which is used to reduce the amount of water required for concrete, by at least 5%. By example, plasticizing agents on the basis of lignosulphonic acids, carboxylic hydroxy acids or processed carbohydrates can reduce the demand on water for concrete by approximately 10-15%.

The term "superplasticizer" or "dosage additive" should be understood as a plasticizing additive, which makes it possible to reduce by more than 12% of the amount of water required for concrete. Superplasticizers in a broad sense can be classified into four groups: the condensate from sulphonated naphthalene-formaldehyde (or SNF), the condensate from sulphonated melamine-formaldehyde (or SMF), modified lignosulfonates (or MLS) and others. Recently developed superplasticizers include dispersing connection polycarboxylate polymer type ("PC"). Some PC superplasticizers may have a comb-like structure including at least one main chain and side chains. Such superplasticizers are indicated by the General reduction of PCP. For example, data superplasticizer which contain ion of the carboxyl function, and/or sulfonic and/or phosphonic type, preferably carboxyl type level main chain and side chains of polyethylene glycol, polypropyleneglycol, copolymers of ethylene and propylene or other circuits, which are preferably water-soluble.

The expression "polyalkyloxy-polycarboxylate" should be understood as comb copolymers in the main chain containing the grafted side chains of polyalkylated.

The expression "the content of ester in the polymer should be understood as the proportion of monomer units of the main chain, bearing ester function defined by the formula below:

in which R1 represents a group containing at least one carbon atom through which it is connected with the oxygen atom of the ester function, and * is the symbol of the main circuit. R1, in particular, can be an alkyl group or vaccinated group polyalkylated. The level of ester expressed as molar percent and it is calculated by dividing the number of ester functions on the main circuit on the total number of monomer units in the main chain.

As an example, the hydraulic binder may be a Portland cement. It can be a cement type CEM I, CEM II, CEM III, CEM IV or CEM V in accordance with the andartu NF EN 197-1 Cement.

According to one variant of implementation of the concentration by weight of the dry residue of the second additive is strictly greater than 25% and strictly less than 100%, preferably ranges from 26% to 99%, most preferably from 30% to 95% of the concentration by weight of the dry residue of the first Supplement.

The second additive is a plasticizer additive, which makes it possible to reduce by more than 12% of the amount of water required for concrete. According to one example variant of the invention, the second additive is a plasticizer additive polycarboxylates or PC type. As an example, the second additive receive, for example, by copolymerization of the monomers polyoxyalkylene(meth)acrylate and monomers of carboxylic acids and optionally other monomers, which copolymerized with these monomers.

The second additive may correspond to a PCP and have a comb-like structure including at least one main chain and side chains. The second additive may be a polymer polyoxyalkylene-polycarboxylate type. According to one variant example of implementation of the present invention, the second additive complies with the addition of CHRYSO Fluid Optima 206 sold Chryso. According to another variant example of implementation of the present invention, the second additive is polycarboxylate on the of oxyalkylene methacrylic nature.

The following describes an example of a method of obtaining a methacrylate polymer, polycarboxylate of polyoxyalkylene methacrylic nature, which can be used as the second additive.

The following components are sequentially introduced into a 500 ml 3-necked flask:

- 86,8 g methyl methacrylate-polyethylene glycol (MMPEG) having a molecular weight of 1100 daltons;

of 13.1 g of methacrylic acid and

- 150 g of tetrahydrofuran (THF).

The flask is equipped with a temperature sensor, the input of nitrogen to carry out the degassing of the solution contained in the flask, and a cooling system to condense the possible eye-catching pair.

After the start of circulation of water in the cooling circuit and degassing with nitrogen begin mixing and heating a reaction medium, in order to set the temperature to 60°C. once the desired temperature is achieved, and the reaction medium sufficiently degassed (approximately 20 minutes) in the flask add 0,42 g thioglycolic. After two minutes add 0,59 g VazoTM52 (thermal initiator sold by DuPont). This operation is used as the initial moment of time. The reaction medium is maintained at this predetermined temperature for 6 hours. Then the heating is stopped and the medium is allowed to cool. After cooling to room temperature to medium, add the water and remove the t THF by rotary evaporator. Thus, getting an aqueous solution of the polymer, which can be used as the second additive according to one variant example of implementation of the present invention.

According to one variant example of implementation of the first additive complies with the addition of CHRYSO Fluid Optima 100 sold Chryso.

According to one variant example of implementation of the first additive meets the following formula (1):

in which:

- R represents a hydrogen atom or a monovalent hydrocarbon group containing from 1 to 18 carbon atoms and optionally one or more heteroatoms;

- Riare the same or different and represent alkylene, for example ethylene, propylene, Amylin, octile or cyclohexene, or arisen, for example styrene or methylsterol, and Rioptionally includes one or more heteroatoms;

- Q is a hydrocarbon group containing from 2 to 18 carbon atoms and optionally one or more heteroatoms;

- A represents alkylidene group containing from 1 to 5 carbon atoms;

- Rjare the same or different and can be chosen from:

*A-PO3H2group, and A has the above meaning;

*alkyl groups containing from 1 to 18 carbon atoms and SP is capable to carry [R-O(R i-O)n] group, and R and Rihave the above meanings;

*group:

in which

- Rkrefers to a group such as Rj;

- B denotes alkylenes group containing from 2 to 18 carbon atoms;

- "n" is a number greater than or equal to 0;

"r" is equal to the sum [R-O(Ri-O)n] groups that are on all Rj;

"q" is equal to the number of [R-O(Ri-O)n] groups that are on Q;

- the amount of "r+q" is equal to from 1 to 10;

- "y" is an integer from 1 to 3;

- Q, N and Rjmay together form one or more cycles, and this or these cycles additionally can contain one or more heteroatoms.

It is possible to use compounds or salts of the compounds of formula (1). Salts of compounds of formula (1) can be stoichiometric or non-stoichiometric mixed or unmixed, and as a cation to contain alkali metals, alkaline earth metals, amines, or Quaternary ammonium.

An example of a method of obtaining compounds of formula (1) described in the patent application Europe 0663892.

According to the invention using the preferred compounds of formula (1) in which R represents a hydrogen atom or a methyl, ethyl or Nonylphenol group. More preferably the R represents a hydrogen atom.

Rjgroup preferably selected from ethylene and propylene. Even more preferably the major part, or all Rjgroups are ethylene and is present in sufficient quantity to maintain a water-soluble or water-dispersible nature of the compounds of formula (1).

Group Q preferably contains from 2 to 12 carbon atoms and more preferably it contains from 2 to 6 carbon atoms. Mostly Q is chosen from ethylene, cyclohexene or n-hexene.

Alkylidene A group that has a divalent carbon atom, preferably contains from 1 to 3 carbon atoms. Especially preferably represents A methylene group.

Rjthe group, which is not necessarily in salt form, preferably selected from-CH2-PO3H2, methyl and C2H4N(CH2PO3H2)2groups. More preferably Rjrepresents-CH2-PO3H2group.

Preferably, n is from 1 to 10000. The value "n" from 1 to 500 is particularly preferred. Ideally, for "n" choose a value that ranges from 1 to 250.

The amount of "r+q" corresponds to the total number polyoxyalkylene links. Preferably this amount is less than 3. More preferably it is equal to 1.

When the connection Faure the uly (1) are in salt form, they preferred are salts of sodium, calcium or diethanolamine.

Ways to get two more specific examples, the first additive of the General formula (1) are described below.

The first example of the first additive meets the following formula (2):

The first example of the first Supplement is made from the typical intermediate compounds corresponding to the following formula (3):

The following components are introduced into one litre 3-necked flask equipped with a cooling device: 226 g of compound of formula (3), and 16.4 g of crystalline phosphorous acid and 12 g of hydrochloric acid in aqueous solution with a concentration of 35%.

The mixture is heated with stirring to 10°C, then for 5 hours enter 17.8 g of an aqueous solution of formaldehyde concentration of 37% and refluxed for seventeen hours.

Then the reaction mixture was poured into 900 cm3cold water, and dry matter content regulate up to 30% dilution.

According to one variant example of implementation of the first additive meets the following formula (4):

in which:

M represents an unbranched or branched hydrocarbon group (not necessarily in the dendrimers, optionally containing one or more heteroatoms (O, N, S); optional different nature;

- Q is a hydrocarbon group containing from 2 to 18 carbon atoms and optionally one or more heteroatoms;

- "p" equals the number of [M] groups that are on Q, and p is from 1 to 10; and

- "y" is an integer from 1 to 3.

Group M, the number of which is equal to p, in General, may be the same or different. Preferably the group M does not include a phosphate group. Each group M may have a molar mass greater than 1000 g/mol. Molar mass of all the M groups of the same molecule is preferably from 2000 to 10,000 g/mol.

Preferably, the number p is not greater than 2y.

Further examples of embodiments will be described with reference to the following drawings, in which:

Fig.1 represents theoretical and the actual change of dosage thinning of the mixture in the hydraulic composition relative to the percentage content of the second additive in the dilution of the mixture to obtain the specified initial RASPLAV; and

Fig.2 represents the change in viscosity and setting time of the hydraulic composition corresponding to Fig.1, relative to the percentage content of the second additive in the dilution of the mixture.

Method of measuring RASPLAV hydraulic composition

<> The measuring principle of RASPLAV is the filling of a truncated cone for measuring RASPLAV hydraulic composition, which should be tested, then the specified release of the composition from the specified truncated cone for measuring RASPLAV in order to determine the surface of the obtained disk when the hydraulic composition graduated distributed. Truncated cone for measuring RASPLAV corresponds to the reproduction scale 1/2 cone defined by standard NF P 18-451, 1981. Truncated cone for measuring RASPLAV has the following dimensions:

- top diameter: 50±0.5 mm;

- bottom diameter: 100±0.5 mm and

- height: 150±0,5 mm

The whole operation is carried out at 20°C. the Measurement repliva is as follows:

Standard cone fill one portion of the hydraulic composition, which must be tested;

- If necessary, obstuctive hydraulic composition that is homogeneous to distribute it in a truncated cone;

- Align the top surface of the cone;

- Vertically raise truncated cone and

- Measure RASPLAV four diameters of 45° with a caliper. The measurement result of RASPLAV is the average of the four values ±1 mm

Method of measuring the viscosity of the hydraulic composition

The viscosity measurement is to measure the time course of the guy who Pavlichenko composition, you want to test, through a truncated cone for measuring viscosity. Truncated cone for measuring the viscosity has the following dimensions:

- larger diameter: 150 mm and

- lesser diameter: 17 mm

Truncated cone for measuring the viscosity further includes a first and a second marker, which can be a parallel marks placed on the sides of a truncated cone and establishing boundaries perpendicular to the axis of the truncated cone. The first label is closer to the base of larger diameter than the second label. The distance between the two marks is 60 mm, and the first label is 12 mm from the base with a larger diameter.

The whole operation is carried out at 20°C. the viscosity Measurement of the hydraulic composition is as follows:

- Orient the axis of the truncated cone vertically, with the smaller diameter is oriented down and plugged the tube;

- Fill a truncated cone hydraulic composition to above the first label;

- Obstuctive hydraulic composition with a spatula to ensure that no large air bubbles;

- Remove the plug;

- Include the stopwatch when the level of the hydraulic composition passes the first label;

- Turn off the stopwatch when the level of the hydraulic composition undergoes a second marker; and

- Write down the lie is, which represents the viscosity of the hydraulic composition.

Method of measuring time of curing and finishing setting mortar

This method is based on a standardized measurement method for determination of setting time and stability according to EN 196-3. It uses automatic meter VICAT setting, as described in the standard EN 196-3, truncated cone and the container. Meter setting VICAT includes needle plate and the mechanism of movement of the needle relative to the plate along the vertical axis. The needle may have a shape of a straight cylinder having a length of more than 45 mm and a diameter of approximately 1,13 mm Axis of the needle is vertical. The container is larger than the form, and placed on the plate. The form has a truncated appearance. The form is placed in the container, and the axis form coincides with the axis of rotation of the plate.

The whole operation is carried out at 20°C. Method of measurement of time starts to set and the end of the setting mortar is as follows:

- Grease a truncated form, using a brush and oil to facilitate the demoulding;

- Put this form in the container;

- Fill the form with mortar;

- Align the surface shapes using a ruler to get a flat surface.

- Put SS the CGS form + container on the plate;

- Add additional weight 700 g at the base of the needle;

- Move the needle in a mortar, and the time between each reduction of the needle is 10 minutes, and the movement of the needle corresponds to free-fall from the free surface of the mortar. This operation is repeated 90 times.

The start time setting is the time after which the needle drops only up to 4 mm ± 1 mm from the bottom of the form. Time is measured from the time t0 of the method of preparing the mixture, described next. End time setting is the time after which the needle drops only up to 0.5 mm mortar. Time is measured from the time t0 of the method of preparing the mixture, described below.

Method of preparing a mortar

Mortar made using the mixer type Perrier. The whole operation is carried out at 20°C. preparation Method includes the following stages:

- Put the sand in the bowl of a mixer;

- At T=0 seconds: start mixing at low speed (140 rpm) and at the same time add water to soak for 30 seconds, then continue mixing at low speed (140 rpm) up to 60 seconds;

- At T=1 minute: stop stirring and leave for 4 minutes.

- At T=5 minutes: (t0 to the method of measurement in which the time setting) add hydraulic binder;

- At T=6 minutes, stirred at low speed (140 rpm) for 1 minute;

- At T=7 minutes: add water for mixing (+ the first and second additives) within 30 seconds (at the same time, mixing at low speed (140 rpm)); and

- At T=7 minutes and 30 seconds: is stirred at high speed (280 rpm) for 2 minutes.

Recipe mortars

For these tests we used two recipes mortars.

Table 1
Recipe mortar 1
ComponentWeight (g)
Cement480,4
Sand ISO1350
Siliceous sand200,1
Limestone filler354,1
The total amount of water
of which:
326,7
water for mixingof 226.7
water to wet the sand100
From osenia water/cement 0,68

Table 2
Recipe mortar 2
ComponentWeight (g)
Cement480,4
Sand ISO1350
Fine-grained sand200,1
Limestone filler340,8
The total amount of water
from which
297,8
water for mixing197,8
water to wet the sand100
The ratio of water/cement0,62

The cement is a Portland cement type CEM I 52.5 N produced at the cement plant of Lafarge Saint-Pierre-La-Cour.

Sand is a certified ISO sand CEN EN 196-1 (Provider: Societe Nouvelle de Littoral). It is a natural siliceous sand with grains rounded, with a silica content of at least equal to 98%. Their particle size is j is carried out within the borders data in table 3.

Table 3
The grain size of sand ISO
The dimensions of the square hole sieve (mm)The accumulated material not passing through the sieve (%)
2,000
1,607±5

1,0033±5
0,5067±5
0,1687±5
0,0899±1

Limestone filler is a filler Erbray (Provider: MEAC). Silica sand represents sand Fulchiron PE2 LS(Provider: Fulchiron).

Specific properties of mortar made in accordance with formulation 1 or 2 and including a mixture of first and second additives for various dosages of the first and second additives were compared in the following examples. The first additive called Add 1 and corresponds CHRYSO Fluid Optima 100 (Provider: Chryso) the following examples. CHRYSO Fluid Optima 100 is a Supplement from the family of di is ofunato, the formula is similar to formula (2). The second additive is named Add 2 and corresponds to the polymer polyalkylene-polycarboxylate type. The concentration or dosage of the first and second additives are given by weight relative to the weight of cement. For each mortar in accordance with the above-described measurement methods were measured following elements:

- the start time of the seizure;

- RASPLAV mortar over successive periods of time and

the viscosity of mortar over successive periods of time.

Example 1

Produced mortar corresponding to the formula 2. Supplement Add 2 was a CHRYSO Fluid Optima 206 (Provider: Chryso). Tested three sample concentrations of additives Add 1 and Add 2. The results are grouped together in table 4 below:

Table 4
Optima 100/Optima 206
(%)
DosageRheology (mm) at 5 minThe viscosity(and) at 5 minThe start time setting
General dosageDosage Add 1 Dosage Add 2
100/00,9%0,9%0,0%30514> 12 hours
50/500,34%0,17%0,17%345245 h 45 min
0/1000,32%0,00%0,32%315354 h 50 min

Dosage only Supplement Add 1 (called "_Add_1") matches the given initial RASPLAV. Dosage only supplements Add 2 (called "_Add_2") corresponds to the same original RASPLAV for this product. Theoretical dosage, "Desirously" mixture, corresponding to the same initial RASPLAV and includes the percentage of "wt.%Add_1" mass Add supplements 1 and the percentage of "wt.%Add 2" weight additives Add 2, can be represented in the form of the law of mixtures according to the following equation:

1DaboutCandpaboutinKthe _with amewith aand=mandwith awith a.%Add_1DaboutCandpaboutinKand_Add_1+mandwith awith a.%Add_2DaboutCandpaboutinKand_Add_2

In this example, theoretical dosage thinning mixture comprising 50% by weight of the additive Add 1 and 50% by weight of the additive Add 2 would be 0,49% by weight relative to the weight of cement in order to obtain the initial RASPLAV about 320 mm Actual received dose was 0,34% by weight relative to the weight of cement. Therefore, the authors showed that all of a sudden the actual dosage of a mixture comprising 50% by weight of the additive Add 1 and 50% by weight of the additive Add 2, for a given initial RASPLAV less than the expected theoretical dosage. Moreover, the initial viscosity (at 5 minutes) mortar, including supplements Add 1 and Add 2 was mostly smaller than the original viscosity of mortar, including only additive Add 2. In addition,the start time setting mortar, including supplements Add 1 and Add 2, mainly was clearly less time curing mortar, including only additive Add 1, and only slightly more time curing mortar, including only additive Add 2.

Example 2

Produced mortar that matches the formula 1. Supplement Add 2 was a CHRYSO Fluid Optima 206 (Provider: Chryso). Tested three sample concentrations of additives Add 1 and Add 2. The results are grouped together in table 5 below:

Table 5
Optima 100/Optima 206
(%)
DosageRheology (mm) at 5 minThe viscosity(and) at 5 minThe start time setting
General dosageDosage Add 1Dosage Add 2
100/00,75%0,75%0,0%3208> 15 h
50/50 0,24%0,12%0,12%330135 h 45 min
0/1000,24%0,00%0,24%340185 h 30 min

In this example, theoretical dosage thinning mixture comprising 50% by weight of the additive Add 1 and 50% by weight of the additive Add 2 would be to 0.36% by weight relative to the weight of cement in order to obtain the initial RASPLAV about 330 mm Actual received dose amounted to 0.24% by weight relative to the weight of cement. Therefore, the authors showed that all of a sudden the actual dosage of a mixture comprising 50% by weight of the additive Add 1 and 50% by weight of the additive Add 2, for a given initial RASPLAV less than the expected theoretical dosage. Moreover, the initial viscosity (at 5 minutes) mortar, including supplements Add 1 and Add 2, was mostly smaller than the original viscosity of mortar, including only additive Add 2. In addition, the start time setting mortar, including supplements Add 1 and Add 2, mainly was clearly less than the start time setting with the automotive solution includes only Supplement Add 1, and was of the same order as the start time setting mortar, including only additive Add 2.

Example 3

Produced mortar that matches the formula 1. Supplement Add 2 represented methacrylate PCP. Tested six examples of concentrations of additives Add 1 and Add 2. The results are grouped together in table 6 below and are illustrated in Fig.1 and 2:

Table 6
Optima 100/PCP
(%)
DosageRheology (mm) at 5 minThe viscosity(and) at 5 minThe start time setting
General dosageDosage Add 1Dosage Add 2
100/00,75%0,75%0,00%3208> 15 h
80/200,30%0,24%0,06%340 116 h 45 min
50/500,24%0,12%0,12%345145 h 55 min
30/700,24%0,05%0,19%335166 h 00 min
10/900,24%0,03%0,21%335165 h 46 min
0/1000,24%0,00%0,24%340155 h 50 min

In Fig.1, the curve C1 represents theoretical change of dosage thinning of the mixture in the mortar concerning the percentage content of the second additive in the dilution of the mixture to obtain the specified initial RASPLAV of approximately 330 mm Curve C1 was obtained from the law of the mixing described above. It was unexpectedly found that in the present example, the reality is th dosage thinning of the mixture was less than theoretical dosage of the composition to obtain the initial RASPLAV about 330 mm In addition, at least before reaching the percentage content of the first additive is less than 75% by mass in the dilution mixture dosage thinning of the mixture increased only very slightly relative to the dosage thinning mixture comprising 100% by weight of the second additive. Moreover, for dispersing composition comprising at least 50% by weight of the additive Add 1, the viscosity of the mortar, including supplements Add 1 and Add 2, mainly was close to the viscosity of the mortar, including only additive Add 1, and was lower than the initial viscosity of mortar, including only additive Add 2. Moreover, the start time setting mortar, including supplements Add 1 and Add 2, mainly was clearly less than the start time setting mortar, including only additive Add 1, and was only about 1 hour more (for dispersant composition comprising 80% by weight of the additive Add 1) compared with the start time setting mortar, including only additive Add 2.

Therefore, when the concentration by weight of the dry residue of the second additive is from 25% to 100% of the concentration by weight of the dry residue of the first additive, at the same time receive the following results:

- mobility, similar mobility that would have been awarded if b is used, only the first additive;

- dosage thinning of the mixture in the hydraulic composition, which is less than the dosage that would have been awarded if you would use only the first additive, more than 50%;

- delay setting which is less than the delay setting that would have been awarded if you would use only the first additive, more than 50%;

a viscosity that is less than the viscosity that would have been awarded if you would use only the first additive, more than 15%.

1. The hydraulic composition, including:
at least one hydraulic binder;
at least one first plasticizing additive comprising at least one phosphonic amino-alkylenes group;
at least one second plasticizing additive comprising at least one polymer with a comb structure, and the concentration by weight of the dry residue of the second additive is strictly greater than 25% and strictly less than 100% of the concentration by weight of the dry residue of the first Supplement.

2. Hydraulic composition under item 1, in which the concentration by weight of the dry residue of the second additive is from 26% to 99% concentration by weight of the dry residue of the first Supplement.

3. The hydraulic composition according to p. 2, in which the concentration by weight of the dry residue of the second additive is from 30% to 95% of concentric and mass of the dry residue of the first Supplement.

4. Hydraulic composition under item 1, in which the second additive is a polymer polyalkylene-polycarboxylate type.

5. Hydraulic composition under item 1, in which the first additive corresponds to the formula:

in which:
- R represents a hydrogen atom or a monovalent hydrocarbon group containing from 1 to 18 carbon atoms and optionally one or more heteroatoms;
- Riare the same or different and represent alkylene, for example ethylene, propylene, Amylin, octile or cyclohexene, or arisen, for example styrene or methylsterol, and Rioptionally includes one or more heteroatoms;
- Q is a hydrocarbon group containing from 2 to 18 carbon atoms and optionally one or more heteroatoms;
And is alkylidene group containing from 1 to 5 carbon atoms
- Rjare the same or different and can be chosen from:
*A PO3H2group, and a has the above meaning; *alkyl groups containing from 1 to 18 carbon atoms and is able to bear [R-O(Ri-O)n] group, and R and Rihave the above meanings;
*and groups

in which
- Rkrefers to a group such as Rj;
-Indicates alkylenes group, containing from 2 to 18 carbon atoms;
- "n" represents a number greater than or equal to 0;
"r" is equal to the sum [R-O(Ri-O)n] groups that are on all Rj;
"q" is equal to the number of [R-O(Ri-O)n] groups that are on Q;
- the amount of "r+q" is equal to from 1 to 10;
- "y" is an integer from 1 to 3;
- Q, N and Rjmay together form one or more cycles, and this or these cycles additionally can contain one or more heteroatoms.

6. Concrete, comprising a hydraulic composition according to any one of paragraphs.1-5, mixed with water.

7. Thinning the mixture of hydraulic binder comprising at least one first plasticizing additive comprising at least one phosphonic amino-alkylenes group, and at least one second plasticizing additive comprising at least one polymer with a comb structure, and the concentration by weight of the dry residue of the second additive is strictly greater than 25% and strictly less than 100% of the concentration by weight of the dry residue of the first Supplement.

8. Thinning the mixture under item 7, in which the second additive is a polymer polyalkylene-polycarboxylate type.

9. Thinning the mixture under item 7, in which the first additive corresponds to the formula:

W is:
- R represents a hydrogen atom or a monovalent hydrocarbon group containing from 1 to 18 carbon atoms and optionally one or more heteroatoms;
- Riare the same or different and represent alkylene, for example ethylene, propylene, Amylin, octile or cyclohexene, or arisen, for example styrene or methylsterol, and Rioptionally includes one or more heteroatoms;
- Q is a hydrocarbon group containing from 2 to 18 carbon atoms and optionally one or more heteroatoms;
And is alkylidene group containing from 1 to 5 carbon atoms;
- Rjare the same or different and can be chosen from:
*A PO2H2group, and a has the above meaning;
*alkyl groups containing from 1 to 18 carbon atoms and is able to bear [R-O(R1-Oh)n] group, and R and Rihave the above meanings;
*and groups

in which
- Rkrefers to a group such as Rj;
- Indicates alkylenes group containing from 2 to 18 carbon atoms;
- "n" represents a number greater than or equal to 0;
"r" is equal to the sum [R-O(Ri-O)n] groups that are on all Rj;
"q" is equal to the number of [R-O(Ri-O)n] groups that finding the by Q;
- the amount of "r+q" is equal to from 1 to 10;
- "y" is an integer from 1 to 3;
- Q, N and Rjmay together form one or more cycles, and this or these cycles additionally can contain one or more heteroatoms.

10. Thinning the mixture under item 7, in which the first additive corresponds to the formula:

in which:
M represents an unbranched or branched hydrocarbon group, optionally comprising one or more heteroatoms;
- Q is a hydrocarbon group containing from 2 to 18 carbon atoms and optionally one or more heteroatoms;
- "p" equals the number of [M] groups that are on Q, and p is from 1 to 10; and
- "y" is an integer from 1 to 3.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to powders for obtaining a self-levelling freshly-prepared concrete mixture. The powder contains, wt %: from 94% to 99% of particles of at least one fire-proof material, whose main component is represented by aluminium oxide and/or zirconium dioxide, and/or silicon dioxide; from 1% to 6% of hydraulic cement; from 0 to 0.03% of organic fibres; optionally from 0.075% to 1%, preferably from 0.1% to 1% of a surface-active substance; and optionally a setting accelerator, with the fraction of particles, possessing the size less than 40 mcm, being distributed relative to the powder mass in the following way, wt %: fraction <0.5 mcm - ≥4%, fraction <2 mcm - ≥5%, fraction <10 mcm - ≥16%, fraction <40 mcm - 29-45%, and a part of zirconium dioxide in the fraction of particles with the size less than 10 mcm, called "fine fractions", is in the range from 35 wt % to 75 wt % relative to the total weight of the said fraction.

EFFECT: improvement of the concrete mixture self-levelling.

24 cl, 6 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to building equipment and can be applied in the production of concrete products for the improvement of their basic physical-chemical properties. The complex additive for concrete mixtures and mortars contains a superplasticiser C-3, a mixture of Iceland spar, aluminium sulphate and fine-grained pyrite in a ratio, wt %: superplasticiser C3 10-30, Iceland spar 50-80, aluminium sulphate 5-7.5, fine-grained pyrite 5-7.51.

EFFECT: improvement of basic properties of concrete: increase of strength and reduction of moisture permeability.

1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: raw material mixture for concrete production, which contains cement, a fine filler, a plasticising additive and water, additionally contains milled and sieved through net No. 10 mobile phone waste with preliminarily extracted accumulators with the following component ratio, wt %: cement 24-36; fine filler 12.7-17.9; plasticising additive 0.1-1.5; water 18-36; milled and sieved through net No. 10 mobile phone waste with preliminarily extracted accumulators 10-40.

EFFECT: safe utilisation of mobile phones.

1 tbl

FIELD: chemistry.

SUBSTANCE: raw material mixture for obtaining artificial stone includes, wt %: Portland cement 28-30, carbon silicides 26-29, iron oxides 1-1.5, water 28-30, cut into 5-15 mm segments asbestos fibre 1-1.5, quartz sand 11-13.

EFFECT: obtaining durable and ecologically safe artificial stone.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a powdered composition of a construction material, preferably dry mortar for industrial production, and especially to tile adhesives, joint filler, putty, waterproofing slurry, repair mortar, levelling mortar, reinforcing adhesives, adhesives for heat-insulation composite systems, mineral plaster, fine putty and seamless floor systems, which contains an ester of A) 2-ethylhexanoic acid and B) an alcohol with a boiling point of at least 160°C. Further, the invention discloses the production of said products, as well as use of esters according to the invention in powdered compositions of construction materials for reducing dust formation. The invention is developed in subclaims.

EFFECT: reducing dust formation, reducing the degree of release of organic compounds during storage and use of construction materials.

14 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: claimed invention relates to a concrete-expanding additive and to a method of obtaining thereof. Concrete with the said additive possesses higher stability in storage. The concrete-expanding additive is obtained by thermal treatment of a clinker or a powder-like clinker, which contains in wt.p. per 100 parts of the clinker free lime in an amount of 10-70, a hydraulic substance 10-50 and water-free calcium sulphate 1-50, in an atmosphere of gaseous carbon dioxide to form in it calcium carbonate. In the method of obtaining an expanding additive clinker, containing free lime, the hydraulic substance and water-free calcium sulphate are subjected to thermal processing to form in it calcium carbonate. The invention is developed in dependent items of the invention formula.

EFFECT: provision of considerable concrete expansion in the period from 2 to 7 days after laying, which makes it possible to develop high early compression strength.

9 cl, 7 tbl

FIELD: construction.

SUBSTANCE: method of preparing the concrete mixture, consisting in mixing of cement, aggregates, water, and aqueous suspension of complex modifier of the following composition, wt %: silica fume 40-70; chemical additives 2-10; water - the rest, which is dried prior to mixing in the air stream to obtain powder consisting of granules, according to the invention, the aqueous suspension of complex modifier before mixing is subject to drying under the influence of continuous electromagnetic field of ultra-high frequency of 400-1000 MHz from microwave oscillators and heated air stream of microwave oscillator cooling to obtain powder with grains of size up to 500 microns and moisture of 9-12%; then the dried powdered complex modifier and cement are subjected to dispersion and disaggregation via exposure to pulsed electromagnetic field of ultra-high frequency of 1000-3000 MHz lasting 1-1.5 seconds, till the obtention of ultrafine powder of complex modifier with size of 60-100 nm, moisture of 1-8% and cement of size 0.1-5 microns, after that they are mixed, ground together and activated, form the disaggregated and activated mixture of cement and complex modifier, which is mixed with filler and water, concrete mixture is obtained; this mixture is subjected to the influence of powerful pulsed electromagnetic field of ultra-high frequency of 400-1000 MHz with duration of 1100÷nanoseconds.

EFFECT: increase of strength of concrete mixture.

1 tbl

FIELD: chemistry.

SUBSTANCE: composition for producing structural materials, comprising mineral binder, filler, water and nanomaterials, characterised by that the mineral binder is cement M-500 and bentonite clays, the filler is aluminosilicate microspheres (Al2O3) with diameter of 5.0-500 mcm, and as nanomaterials, the composition further includes a microstructure of needle-like wollastonite filler MIVOLL-97, free of natural calcium metal silicate, and fractional microcalcite MICARB "STANDARD"-96 and a foaming agent PB-200, with the following ratio of components, wt %: bentonite clays 2.0-8.0, aluminosilicate microspheres with diameter of 5.0-500.0 mcm 3.0-25.0, MIVOLL-97 - 1.5-5.5, MICARB "STANDARD"-96 - 2.0-8.0, silicon nanostructures AEROSIL - 2.0-5.0, foaming agent PB-200 - 1.0-4.0, water - 3.0-15, cement M-500 - the balance.

EFFECT: obtaining a high-strength composition with improved processing properties structural materials, the present combination of ingredients of the composition is optimal and enhances positive working qualities thereof.

4 ex, 5 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to special concrete compositions and can be used in the industry of structural materials in producing radiation-proof concrete, including concrete for "dry protection" of a nuclear power plant reactor. The radiation-proof concrete composition contains inorganic binder, serpentinite chips with particle size of 5-20 mm, serpentinite peebles, water, the composition being characterised by that it further contains a superplasticiser, calcium oxide, magnesium oxide, barium oxide or mixtures thereof, with the following ratio of components, wt %: inorganic binder 5.0-20.0; serpentinite chips with particle size of 5-20 mm 31.0-55.0; serpentinite peebles 6.0-30.0; alkali-earth metal oxides 8.9-10.0; superplasticiser 0.1-1.0; water 4.0-8.0.

EFFECT: high quality of concrete as a result of improved workability and reduced demixing when applying the concrete mixture due to reduced water segregation and mortar segregation, as well as faster drying of the concrete.

2 cl, 1 tbl

FIELD: construction.

SUBSTANCE: composite construction material comprising a cement binder, a filler, lignocellulose materials and an additive - a mixture of low molecular polyethylene and urea at the ratio of 1:1, additionally contains a non-ionogenic surfactant polyvinyl pyrrolidone at the following ratio of components, wt %: cement binder 20-30, filler 44-56, non-ionogenic surfactant polyvinyl pyrrolidone 0.5-2, lignocellulose materials 5-12, mixture of low molecular polyethylene and urea at the ratio of 1:1 0.5-3.5, water - up to 100.

EFFECT: development of a composite construction material to manufacture concrete products, making it possible to increase compressing strength, cone slump, tensile strength in bending, elasticity modulus and to reduce water absorption.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to building equipment and can be applied in the production of concrete products for the improvement of their basic physical-chemical properties. The complex additive for concrete mixtures and mortars contains a superplasticiser C-3, a mixture of Iceland spar, aluminium sulphate and fine-grained pyrite in a ratio, wt %: superplasticiser C3 10-30, Iceland spar 50-80, aluminium sulphate 5-7.5, fine-grained pyrite 5-7.51.

EFFECT: improvement of basic properties of concrete: increase of strength and reduction of moisture permeability.

1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a composition of polymers, used as a component of a dispersing preparation, its obtaining and application. Claimed is the composition for application as the dispersing preparation, containing 5-95 wt % of a copolymer H and 2-60 wt % of a copolymer K, the copolymers H and K each has polyether macromonomer structural elements and acidic monomer structural elements, present in the copolymers H and K in each case in a molar ratio from 1:20 to 1:1, and at least 20 mol. % of all structural elements of the copolymer H and at least 25 mol. % of all the structural elements of the copolymer K are present in each case in the form of the acidic monomer structural elements. Polyether macromonomer structural elements of the copolymer H, which has side chains, contain in each case at least 5 oxygen atoms of ether, with a number of oxygen atoms of ether per the side chain of the polyether macromonomer structural elements of the copolymer H changing in such a way that a respective diagram of distribution of occurrence frequencies, in which the number of oxygen atoms of ether per the side chain of the polyether macromonomer structural element is plotted along the abscissa axis, and combined frequency for the copolymer H is plotted along the ordinate axis, contains at least two maximums. A method of obtaining the said composition, its application and based on it dispersing preparation is also claimed.

EFFECT: dispersing preparation based on the claimed composition is economical, makes it possible to obtain effective binding agents, used as a superplasticiser for concrete.

92 cl, 2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a water polymer dispersion for the application as an additive for compositions, which contain a hydraulic binding substance or a binding substance with latent hydraulic properties, a multi-component composition for obtaining binding solutions, mortars or cement, a hardened composition for the application in civil engineering construction or building construction, to the said building constructions, as well as to the application of the said water polymer dispersion. The water polymer dispersion contains a) dispersed copolymer, consisting of at least two monomers, selected from the group, consisting of ethylene, propylene, butylenes, isoprene, butadiene, styrene, acrylnitrile, acrylic acid, metacrylic acid, alkylacrylate, alkylmetacrylate, vinyl ether and vinyl chloride, b) comb-like polymer, which has side chains, bound with the main chain by means of ether or ester groups and c) water.

EFFECT: obtaining the water polymer dispersion for the addition in hydraulic and possessing latent hydraulic properties binding substances, which makes it possible to achieve an increase of mechanical properties of the said substances and reduce porosity and water absorption by the said substances.

9 cl, 4 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymer composition used in composition of dispersing substance, its obtaining and application. Claimed is polymer composition for application as dispersing substance, which contains 3-95 wt % of copolymer H and 3-95 wt % of copolymer K, with each of copolymers H and K containing structural units of polyether macromonomer and structural units of acid monomer , which are present in copolymers H and K, in each case, in molar ratio 1:20-1:1, and at least 20 mol. % of all structural units of copolymer H and at least 25 mol% of all structural units of copolymer K, in each case, are present in form of structural unit of acid monomer, with structural units of polyether macromonomer of copolymers H and K containing side chains, in each case, which contain, at least, 5 atoms of ether oxygen, and quantity of atoms of ether oxygen in side chain of structural units of polyether macromonomer of copolymers H and K, in each case, varies in such a way that respective diagrams of density of distribution of probabilities, where quantity of atoms of ether oxygen, in each case, is presented on abscissa axis and respectively corresponding frequencies of occurrence of copolymers H and K, in each case, are presented on ordinate axis, contain, in each case, at least, 2 maximums, whose abscissa values, in each case, differ from each other by more than 7 atoms of ether oxygen, and diagrams of density of distribution of probability of copolymers H and K differ from each other by the fact that abscissa value of, at least, one maximum of copolymer H, in each case, differs by more than 5 atoms of ether oxygen from abscissa values of all maximums of copolymer K, and/or by the fact that mean arithmetic values of atoms of ether oxygen of structural units of macromonomer of polyether of copolymers H and K differ from each other by more than 5 atoms of ether oxygen. Method of obtaining said composition, its application and based on it dispersing preparation are also claimed.

EFFECT: dispersing preparation based on claimed composition is economical, makes it possible to obtain effective hydraulic binding substances, used as superplasticiser for concrete.

23 cl, 2 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the field of construction materials, in particular to compositions of additives, used in the production of precast reinforced concrete and commercial concrete. A complex additive for concretes and mortars, includes a plasticiser and an amine organic base, with the following ratio (wt %): plasticiser - 70÷90; amine organic base - 10÷30, as the plasticiser it contains polymethylene-naphthalenesulphonate, and as the amine organic base it contains tetra-aza-adamantane or its mixture with hydroxylamine or alkanolamines. The complex additive for the concretes and construction materials can additionally contain auxiliary components of air-entraining, stabilising, and hydrophobising action, regulators of structure-formation kinetics, foam extinguishers, additives of air-removing action or mixtures of the said compounds.

EFFECT: improvement of deformation characteristics of concretes, ie reduction of creep and shrinkage with unchanged preservability and mobility of concrete mixtures, ensuring the stable strength growth.

2 cl, 2 tbl

Concrete mixture // 2525565

FIELD: chemistry.

SUBSTANCE: concrete mixture includes Portland cement, crushed granite, quartz sand, a microfiller, a superplasticiser based on polycarboxylates and water. Additionally into the mixture introduced is TTP fly ash, as the microfiller used is ground limestone MP-1, and as the superplasticiser, based on polycarboxylates MC-RowerFlow 2695, with the following component ratio, wt %: Portland cement 8-10, ground limestone MP-16-8, TPP fly ash 3-6, quartz sand with the coarseness module Mc 1.9 30-40, crushed granite of fraction 3-10 mm 15-18, crushed granite of fraction 5-20 mm 14-16, the superplasticiser based on polycarboxylates MC-RowerFlow 2695 0.0015-0.003, water - the remaining part.

EFFECT: increase of concrete quality due to increased fluidity of the concrete mixture and its self-compaction.

1 tbl

FIELD: construction.

SUBSTANCE: dry building mixture for monolithic-type building construction, which includes Portland cement, alumina cement, hydrated lime, gypsum, quartz sand, filler, re-dispersed polymer, cellulose ester, antifoaming additive, superplasticising agent, hardening agent, retarding agent, contains bauxite cement as alumina cement, hemihydrate plaster as gypsum, quartz sand with fineness modulus of up to 1.2, filler with specific surface area S sp 2.5-2.8 cm2/g, which contains 5-7 wt % of nanoparticles, polycarboxylate superplasticising agent and in addition high-molecular chitosan at the following component ratio, wt %: Portland cement - 12-33, bauxite cement - 12-19, hydrated lime - 0.3-0.5, hemihydrate plaster - 2.5-6, quartz sand with fineness modulus of not more than 1.2 - 30-50, the above filler - 5-18, re-dispersed polymer - 4-6, cellulose ester - 0.1-0.17, antifoaming additive - 0.1-0.3, polycarboxylate superplasticising agent - 0.2-0.3, hardening agent - 0-0.5, retarding agent - 0-3.5, high-molecular chitosan (200-250 kDa) - 1-2 wt % of Portland cement weight.

EFFECT: increasing sedimentation stability of water-based building mixture; improving impact strength and reducing abrasion of hardened mixture.

4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a hardening accelerator composition by reacting a water-soluble calcium compound with a water-soluble silicate compound and a method of preparing a hardening accelerator composition by reacting a calcium compound with a silicon dioxide-containing component in an alkaline medium, in both cases the reaction of the water-soluble calcium compound with the water-soluble silicate compound being carried out in the presence of an aqueous solution which contains a water-soluble comb polymer suitable as a plasticiser for hydraulic binders. The invention also relates to a composition of calcium silicate hydrate and comb polymer, use thereof as a hardening accelerator and for reducing permeability of hardened mixtures.

EFFECT: obtaining a hardening accelerator having plasticiser properties, which is capable of increasing strength and wear resistance.

41 cl, 12 tbl, 3 dwg

FIELD: chemistry.

SUBSTANCE: claimed invention relates to application as additive, which improves processability of water formulation with hydraulic binging agent base of: a) at least, one (meth)acryl crest-branched copolymer, which has, at least, one side chain, which carries, at least, one alkoxy- or hydroxypolyalkylenglycol hydrophilic group, b) at least, one ASE (alkaline-soluble emulsion) acryl copolymer. Invention also relates to water formulation with hydraulic binding agent base, which contains as additive, which improving its processability: a) at least, one (meth)acryl crest-branched copolymer, which has, at least, one side chain, carrying, at least, one alkoxy- or hydroxypolyalkylenglycol hydrophilic group, b) at least, one ASE - alkaline-soluble emulsion acryl copolymer. Invention is advanced in dependent i.i. of invention formula.

EFFECT: improvement of processability of claimed formulation without manifestation of segregation effect.

22 cl, 10 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to production of construction materials, particularly a fine-grained concrete mixture and a preparation method thereof, and can be used to make concrete structures, both monolithic and assembled, that used in the industry of construction materials and construction. In the method of preparing a fine-grained concrete mixture, which involves pre-modification of the surface of an aggregate, followed by mixing said aggregate with cement and water, the modifier used is alkyldimethylbenzylammonium chloride in amount of 0.1% of the mass of cement, and the aggregate used in ratio of 1:1 is a mixture of quartz sand with fineness modulus of 1.9 and screenings from grinding rocks from the Argun deposit with grain size of 5-10 mm, with the following ratio of components, wt %: cement - 19-25, aggregate - 68-75, water 6-7. The disclosed fine-grained concrete mixture is prepared using said method.

EFFECT: obtaining a fine-grained concrete mixture with improved physical-mechanical and operational properties based on an aggregate made from local material.

1 tbl, 2 cl

FIELD: building materials, in particular grouting mortar, concrete mix, and dry building mix.

SUBSTANCE: claimed complex powder additive contains (mass %): superplasticizer 66.7-72.7; commercial lignosulfonates 17.4-20.0; organopolysiloxane (e.g. sodium ethylsiliconate or methylsiliconate containing 5.53-6.11 mass % of silicon and having polymerization degree of 9-12) 7.3-15.9.

EFFECT: high-technology dry plasticizer, providing optimum air entrainment and stable physical and mechanical properties of concrete and mortars under negative temperatures.

2 tbl

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