Anti-frost complex additive and methods to produce dry form of additive (versions)

FIELD: construction.

SUBSTANCE: in this method to produce a dry anti-frost complex additive, including mixing of a plasticising component, a salt component and an intensifier of anti-frost action, the intensifier of anti-frost action is a water-soluble organic component not containing salt-producing functional groups, with the HLB value of 2.8-4.3, which is dried on a carrier - the plasticising component, and the produced powdered product is mixed with the dry salt component to produce the following content of components, wt %: plasticising component - 10-80, salt component - 10-75, intensifier of anti-frost action - 5-15. In the version of the method to produce a dry anti-frost complex additive, including mixing of a plasticising component, a salt component and an intensifier of anti-frost action, the intensifier of anti-frost action is a water-soluble organic component not containing salt-producing functional groups, with the HLB value of 2.8-4.3, which is mixed with the dry plasticising component, and the produced paste-like mass is mixed with the dry salt component to produce loose mass. The invention also relates to composition of the dry anti-frost complex additive produced by above methods.

EFFECT: lower doses of complex anti-frost additives due to increase of their technical efficiency and narrower range of recommended doses for entire temperature range of their application with provision of convenience of their transportation and storage.

7 cl, 2 tbl, 10 ex

 

The group of inventions relates to a method for obtaining and complex additives for concrete and mortars, and may find application in the production of concrete and reinforced concrete products and structures (when concreting at low temperatures).

When concreting in cold weather uses different additives that accelerate the set of the early strength of the concrete and reduces the period of time up to a set of concrete critical strength.

Comprehensive antifreeze additive is most appropriate to produce in the dry form, which allows you to facilitate its transportation and storage.

In the production of complex additives in concrete and mortars in the dry form is used the method of mixing the components in dry form, which is the closest analogue to the proposed invention the methods of producing the complex supplements in dry form for options 1 and 2. It is the mixing of the individual components of a comprehensive supplements available in dry form [Additive in concrete: a resource book / B. C. Ramachandran, R. F. Feldman, M. Collepardi and others, edited by B. C. Ramachandran. TRANS. from English. T. I. Rosenberg, and S. A. Boldyrev. Moscow: stroiizdat, 1988 - 575]. The disadvantage of this method is its unsuitability for receiving the dry form of supplements containing components liquid is MD state of aggregation or components, which cannot be found in the form of a dry product on the existing drying equipment.

Known use as antifreeze additives (PDP) of various inorganic (calcium chloride, sodium nitrite, calcium nitrate, and so on) or organic (formate and acetate sodium) salts. Depending on the type of salt used and the dosage of mine action allow hardening of the concrete up to temperatures of -25°C. [Additive in concrete: a resource book / B. C. Ramachandran, R. F. Feldman, M. Collepardi and others, edited by B. C. Ramachandran. TRANS. from English. T. P. Rosenberg and S. A. Boldyrev. M.: stroiizdat, 1988 - 575].

The disadvantage of such mine action on the basis of salts are very high dosages, up to 29% of dry matter by weight of cement for a range of ambient temperatures (-20)÷(-25)°C.

Known [RF Patent №2187480 "Complex additive to concrete and mortars"] complex additive for concrete and mortar used in concreting at low temperatures, including calcium chloride and saharat calcium as the amplifier antifreeze action. When this mass ratio saharat calcium and calcium chloride and 0.0001-0,001:1.

The disadvantage of this additive is the need to introduce it in high dosage for concrete casting in the temperature range (-20)÷(-25)°C.

There is also known a method of increasing efficiency is the efficiency of the action of salt-de-icing due to their use in combination with plasticizers or superplasticizers additives. The closest analogue of the present invention is the complex additive for concrete and mortar [RF Patent №2307099 "Complex additive for concrete and mortar "Trioplast A25" dated 08.12.2005,] including superplasticizer, technical lignosulfonates (lsls), potash and sodium formate in the following ratio, wt.% (on dry matter): superplasticizer 5-40; lsls 0,5-10; potash 10-40; formate sodium - rest.

As a superplasticizer in the prototype, the use of superplasticizers naphthaleneformaldehyde type-3 or Polyplast SP-1.

The use of such an additive allows to reduce the dosage of mine action (for a range of ambient temperatures (-20)÷(-25)°C up to 6%); however, the amount of added water-soluble substances and salts is still too high, which causes the deterioration of durability of concrete and the restriction of use of additives.

The technical task of the present group of inventions is a significant reduction of dosages of complex antifreeze additives by improving their technical efficiency and the narrowing of the range of the recommended dosage for the entire temperature range of their application, while ensuring ease of transportation and storage.

The technical problem is solved t is m, that:

The method according to option 1 get dry antifreeze additive comprises mixing a plasticizer component, a salt component and amplifier antifreeze action, the amplifier antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 to 4.3, which is dried on the carrier - plasticizing component, and the resulting powdery product is mixed with dry salt component before receiving the next content, wt.%:

plasticizing component - 10-80;

the salt component - 10-75;

the amplifier antifreeze action - 5-15,

while stirring, in addition, you can enter the auxiliary components air stabilizing water-repellent action or mixtures of these compounds.

The method according to option 2 get dry antifreeze additive comprises mixing a plasticizer component, a salt component and amplifier antifreeze action, the amplifier antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 to 4.3, which is stirred with dry plasticizing comp is the component, and the resulting pasty mass is stirred with dry salt component to education crumbly mass with the following content, wt.%:

plasticizing component - 10-80;

the salt component - 10-75;

the amplifier antifreeze steps 5-15,

while stirring, in addition, you can enter the auxiliary components air stabilizing water-repellent action or mixtures of these compounds.

- Antifreeze the complex obtained above methods for option 1 or option 2.

In the composition of the dry antifreeze additive as a plasticizing component use supplements based on lsls, polyethylenepolyamines (PNS), melamineformaldehyde compounds of polycarboxylates, on the basis of condensed sulfadiazine phenol, copolymers based on PNS, copolymers based on melaninogenicus or mixtures of several of these components, as well as salt component using sodium nitrite, sodium nitrate, sodium formate, potassium, sodium acetate, technical formate (FTP), sodium thiocyanate, sodium thiosulfate, a mixture of technical thiosulfate and thiocyanate, sodium, chlorides of calcium, sodium and potassium, calcium nitrate, the calcium nitrite or a mixture of several of these components; as maximizing the La antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3.

The method of obtaining dry antifreeze additive for option 1 includes mixing a plasticizer component, a salt component and amplifier antifreeze action. Initially located in the liquid aggregate state amplifier antifreeze action mixed with an aqueous solution of plasticizing component, and then the resulting solution is dried by any known method (for example, in the spray dryer, the dryer with inert medium fluidized bed or other equipment type); the thus obtained powder is then mixed with dry salt component.

When the mixture can optionally enter auxiliary components air stabilizing water-repellent action or mixtures of these compounds. These components can be introduced in the solution mixture of plasticizing component amplifier with antifreeze action, followed by drying the resulting solution, and at the stage of the dry mix with the salt component.

The method of obtaining dry antifreeze additive for option 2 includes mixing a plasticizer component, a salt component and the amplifier antifreeze action. First dry plasticizing component is mixed with liquid status and amplifier antifreeze action. The obtained pasty mass is mixed with dry salt component to education crumbly mass.

When the mixture can optionally enter auxiliary components air stabilizing water-repellent action or mixtures of these compounds. These components can be introduced in solution plasticizing component, followed by drying the resulting solution, and at the stage of the dry mix with the salt component.

The claimed range of ratios of the components of an additive obtained by the methods according to options 1 and 2, is set experimentally and is the best.

When the content of the plasticizing component in the complex additive obtained by the methods according to options 1 and 2 more than 80%, there is a risk of overdose, when changing the lower limit of the recommended range of dosage (10%) there is a shortage of plasticizing component, leading to deterioration of mobility or increase the water demand of concrete.

When the content in the complex antifreeze additive amplifier antifreeze steps less than 5% on the dry substance is not observed pronounced synergetic effect from its application. The increase in the content of this component above the level of 15% does not lead to further reduction dosiro and complex additives to achieve the proper antifreeze effect.

The content in the complex antifreeze additive salt component is less than 10% leads to insufficient antifreeze effect, and when the content is more than 75% it is impossible to ensure the optimum content of the plasticizing component and amplifier antifreeze action.

The use of an additive obtained by the above methods according to options 1 and 2, containing a plasticizing component, a salt component and the amplifier antifreeze action, leads to a synergistic effect which increases the activity of the additive and, therefore, significantly reduced her dosage. The proposed integrated antifreeze additive in concrete and mortars at a much lower her dosage in comparison with the prototype allows to achieve high anti-frost effect and to provide a high mobility persistence of concrete and mortar mixes (one hour after cooking mobility mixtures remains virtually unchanged). When this concrete mixtures and mortars with complex additive are sedimentation stable in the whole range of dosages of supplements.

More technical nature of the invention and achieved effects can be illustrated by the following examples.

The method of obtaining the dry form of comprehensive prot is vodorodnoi supplements for option 1 is illustrated by the following example (table.1).

Superplasticizer naphthalenesulfonate type "Polyplast SP-1 TU-5870-005-0580-42865, with a mass fraction of solids of 45% was mixed with a liquid not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycerol in the ratio of 14.9:1 by weight technical products (87:13 to the base material).

The resulting aqueous solution was dried in a fluidized bed dryer with a temperature below the grille 226°C, the temperature of the layer 115°C and temperatures above the layer 105°C with air flow of 1000 m3/hour.

The resulting brown powder was mixed in the installation of dry blending with crystalline sodium formate technical (AFP) TU 2432-011-00203803-98 in the ratio of 9:1.

The method of obtaining the dry form complex antifreeze additives for option 2 is illustrated by the following example (table.1).

Dry superplasticizer naphthalenesulfonate type "Polyplast SP-1 TU-5870-005-0580-42865 obtained by any known method (spray dryer, fluidized bed, with an inert carrier, and so on) mixed with a liquid not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8-4.3 to ethylene glycol in the ratio of 90:10. After thorough mixing, the resulting homogeneous paste-like product was mixed with dry sodium formate technology is economic (the FCA) TU 2432-011-00203803-98 (ratio 80:20) to education crumbly mass.

For the preparation of an additive according to the invention by the methods according to options 1 and 2 as a plasticizing component use supplements based on lsls, PNS, melamineformaldehyde compounds of polycarboxylates, on the basis of condensed sulfadiazine phenol, copolymers based on PNS, copolymers based on melaninogenicus or a mixture of a number of specified components, as a salt component are used, the sodium nitrite, sodium nitrate, sodium formate, potassium, sodium acetate, technical formate (FTP), sodium thiocyanate, sodium thiosulfate, a mixture of technical thiosulfate and thiocyanate, sodium, chlorides of calcium, sodium and potassium, calcium nitrate, the calcium nitrite or a mixture of several of these components.

As the amplifier antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycerine, ethylene glycol, diethylene glycol.

Example 1. Plasticizing component - MSP - 80; salt component sodium nitrite - 15; not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycerin - 5.

Example 2. Plasticizing component - polycarboxylate - 10; salt component - formate sodium - 75; not containing salt-forming functional groups of the water is actuarily organic component with products HLB value of 2.8-4.3 to glycerin - 15.

Example 3. Plasticizing component - lsls - 35; salt component - sodium acetate - 55; does not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycol - 10.

Example 4. Plasticizing component polymethylenepolyphenylene - 30; salt component - sodium nitrate - 58; not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - diethylene glycol - 12.

Example 5. Plasticizing component - Polyplast SP-4 (copolymer based on PNS) - 80; salt component technical formate 10; not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycerol - 10.

Example 6. Plasticizing component is a mixture of lsls and PNS (1:1) - 35; salt component - sodium thiosulfate - 60; not containing salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycol - 5.

Example 7. Plasticizing component is a mixture of PNS, melamineformaldehyde compounds of polycarboxylate based on condensed sulfadiazine phenol, copolymers based on PNS(1:1:1; 1; 1) - 35; the salt component is a mixture of technical thiosulfate and thiocyanate sodium - 50; not containing salt-forming functional groups odorant arimy organic component with products HLB value of 2.8-4.3 to glycerin - 15.

Example 8. Plasticizing component - lsls - 35; salt component - sodium acetate - 55; does not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycol - 10, air entrainment component (start) - 0,1 (over 100%).

Example 9. Plasticizing component - lsls - 35; salt component - sodium acetate - 55; does not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycol - 10; air component (start) - 0,1 + hydrophobic component (NGL-10) - 1 (above 100%).

Example 10. Plasticizing component - lsls - 35; salt component - sodium acetate - 55; does not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 and 4.3 - glycol - 10; air component (start) - 0,1 + stabilizing component (CMC) - 1 - (over 100%).

Compounds 1, 2, 3, 4 prepared by the method according to p. 1, part 10 - a method according to p. 2, with the auxiliary components is introduced into a solution mixture of plasticizing component amplifier with antifreeze action, followed by drying the resulting solution, compounds 5, 6, 7 prepared by the method according to p. 3, compounds 8, 9 prepared by the method according to p. 4, wherein the auxiliary components is introduced into the plasticizing solution components the NTA with the subsequent drying of the resulting solution (example 8) and on the stage of dry mix with salt component (example 9). The same results are obtained using all the above components.

To assess the impact of complex additives, obtained by the method according to p. 1, 2, and p. 3, 4, on the properties of concrete mixes and concrete in comparison with the prototype was tested in accordance with GOST 30459-2008 for concrete mixes with material consumption (kg/m3): cement - 350, sand - 850, gravel - 990. The additive was desirables on the dry matter percent by weight of cement. The compressive strength was determined according to GOST 10180.

The results are given in table.1, 2.

Analysis of the results of the tests showed the following.

When comparing the strength characteristics of concrete with the additive-prototype and the additive according to the invention obtained by the methods under item 1 and 3 (table.1) shows that the use of the additive according to the invention allows to provide a higher strength characteristics of concrete, Tverdovsky at low temperatures. So, for the case of use of the additive according to the invention according to options 1 and 2 compressive strength of concrete at age of 28 days is 11,9 - 12 MPa, which is 12-15% higher than the corresponding values for variants of use of the additive-prototype. It is important to note that this increase is not due to the W/C-ratio (which in one pair decreases and the other increases), namely at the expense of main (antifreeze) f is the additive. With dosages (on dry matter) in the application of the additive prototype and additives according to the invention by variant 1 and 2 differ by more than 7 times: 3-5% for prototype and 0.39-0.65 per cent according to the invention.

In table.2 provides examples demonstrating the possibility of obtaining an effective antifreeze additives throughout the claimed range of content components. Through appropriate selection of the plasticizing component even with the minimum content of superplasticizer effect is achieved superstructure (21,8%) according to GOST 24211-2008; maximum levels of superplasticizer and unchanged total dosage of the additive value of photoreductive reaches of 25.5%. In both cases, provided the performance criteria antifreeze additives according to GOST 24211-2008 for both cold and warm concrete. As in the examples in the table.1, the strength at low temperatures is not determined by the W/C ratio concrete, and the optimal composition of the components of a comprehensive antifreeze additives.

Examples 3, 6, 7, are given in table.2 shows that with increasing content of complex antifreeze additive amplifier antifreeze steps from 5 to 15%, there is a saving of plasticizing properties of the additive: when reduced and a constant value of W/C concrete mix is provided sediment to the USA within the brand mobility P3.

With the increasing content of amplifier antifreeze steps 5 to 10% there is a significant increase of the compressive strength of "cold concrete". So, at -20°C strength of concrete at 28 days increased from 10.3 to 12.5 MPa, respectively, which is 22%. Subsequent increase in the content of amplifier 15% is practically no further increase in the strength of the concrete (less than 1%).

1. The method of obtaining dry antifreeze additive comprising mixing a plasticizer component, a salt component and amplifier antifreeze action, characterized in that as the amplifier antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 to 4.3, which is dried on the carrier - plasticizing component, and the resulting powdery product is mixed with dry salt component to obtain the following content of components, wt.%:
plasticizing component - 10-80;
the salt component - 10-75;
the amplifier antifreeze action - 5-15.

2. The method according to p. 1, characterized in that when mixed impose additional auxiliary components air stabilizing hydrophobic the enabling act or a mixture of these compounds.

3. The method of obtaining dry antifreeze additive comprising mixing a plasticizer component, a salt component and amplifier antifreeze action, characterized in that as the amplifier antifreeze actions use do not contain salt-forming functional groups of the water soluble organic component with products HLB value of 2.8 to 4.3, which is stirred with dry plasticizing component, and the resulting pasty mass is stirred with dry salt component to education crumbly mass with the following content, wt.%:
plasticizing component - 10-80;
the salt component - 10-75;
the amplifier antifreeze action - 5-15.

4. The method according to p. 3, characterized in that when mixed impose additional auxiliary components air stabilizing water-repellent action or mixtures of these compounds.

5. Antifreeze complex additive obtained by the methods according to any one of paragraphs. 1, 2, or according to any one of paragraphs. 3, 4.

6. Antifreeze complex additive under item 5, characterized in that the plasticizing component it contains additives based LST, PNS, melamineformaldehyde compounds of polycarboxylates, on the basis of condensed sulfadiazine phenol, copolymers based on PNS, SOP the materials on the basis of malminkartano or mixtures of several of these components.

7. Antifreeze complex additive under item 5, characterized in that as the salt component it contains sodium nitrite, sodium nitrate, sodium formate, potassium, sodium acetate, technical formate (FTP), sodium thiocyanate, sodium thiosulfate, a mixture of technical thiosulfate and thiocyanate, sodium, chlorides of calcium, sodium and potassium, calcium nitrate, calcium nitrite or a mixture of several of these components.



 

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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

Complex additive // 2527442

FIELD: chemistry.

SUBSTANCE: invention relates to field of construction materials, in particular to compositions of additives, used in production of articles from slow-moving and rigid concrete mixtures with application of technologies of classical vibrational moulding, extrusion moulding and vibropressing. Complex additive includes additives of plasticising and air-entraining action. As additive with plasticising action used are lignosulphonates, with additional introduction into it of accelerator of hardening and regulator of thixotropic properties. Complex additive contains said components with the following ratio, (wt %): lignosulphonate - 30-70; additive with air-entraining action - 2-7; accelerator of hardening - 15-60; regulator of thixotropic properties - 5-15. as additive with air-entraining action, used are alkylsulphates, alkylsulphonates, ethoxylated fatty alcohols, salts of sulphoethoxylated fatty alcohols or mixture of any said compounds. as accelerator of hardening, used are sodium rhodanide, sodium thioculphate, sodium sulphate, sodium or calcium formiate, alkanolamines or mixture of two or more said compounds.

EFFECT: claimed complex additive provides required thixotropic properties of slow-moving and rigid concrete mixtures and accelerates acquirement of strength.

3 cl, 1 tbl

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