Concrete mixture

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

 

The invention relates to the composition of the raw mix for concrete with high density, the absence of large pores reduces the risk of corrosion of the concrete, which increases the durability of concrete, and the possibility of its use in harsh environments and can be used for the production of high quality concrete.

Known patent: "Concrete composition for the production of construction materials, Torreblanca and cementation works containing Portland cement, superplasticizer C-3, condensed silica fume with a specific surface area (15-25)·103cm2/g quartz sand fraction less than 0.14 mm and 1.25-2.50 mm, ground quartz sand with a specific surface area (3.5 to 4.0)·103cm2/g, the complex additive is the product of a collaborative intensive dry milling to specific surface area (4.0 to 4.5)·103cm2/g aluminate clinker cement brand "500" or "600" with the share of tricalcium aluminate With3Al it 8-12%, quartz sand with a specific surface area (1.5 to 2.5)·103cm2/g dry powder superplasticizer C-3, taken in the ratio 5:4:1, respectively, the reinforcing component - chrysotile and grinding dust - waste production of asbestos products and water in the following ratio, wt.%:

Portland24,0-25,0
Specified fume4,0-5,5
Quartz sand fraction less than 0.14 mm20,0-21,0
Quartz sand fractions of 1.25-2.50 mm28,0-31,0
Superplasticizer C-30,4-0,8
Specified ground quartz sand6,5-8,0
Specified complex additive2,5-3,0
Chrysotile0,6-1,6
Grinding dust is a waste product
asbestos products0,6-1,6
WaterRest

RF patent for the invention №2365554, MKI: C04B 28/04, date of publ. 27.08.2009.

Also known patent "Cement with low water and the method thereof", containing Portland cement, mineral filler in the form of siliceous material and organic dewatering reagent, characterized in that it further as the mineral filler is taken carbonate-bearing material with a grain of calcium carbonate at least 60%, when the ratio of siliceous material and carbonate-bearing material 5:95-95:5, all components are taken in the following ratio, wt.%:

Portland50-70
Carbonate-bearing
and siliceous materials30-50

Organic dewatering reagent of 0.3 to 3.0% by weight of cement with low water

RF patent №2373163 MCI: C04B 7/00, C04B 7/52 date publ. 20.11.2009.

The closest analogue of the claimed invention is "Raw mix for the production of high-strength concrete with Portland cement, crushed stone, silica sand, silica fume or quartz it, superplasticizer based polycarboxylate ether and water, characterized in that it contains crushed granite as a superplasticizer based on polycarboxylate ether - Glenium 51 or Glenium ACE 30 and additionally PASCH - adipinate sodium and calcium formate in the following ratio of components, kg/m3concrete:

Portland350-650
Crushed granite 900-1200
Sand quartz600-800
Microsilica or silica it7-130
Water110-190

Specified superplasticizer of 0.10 to 3.0 wt.% from Portland

PASCH 0.01 to 0.07 wt.% from Portland cement, calcium formate 0.5 to 3.0 wt.% from Portland cement.

RF patent for the invention №2363680 MCI: C04B 28/04, date of publ. 10.08.2009

The disadvantages of the above-described concrete mixes is that they use superplasticizers in high dosages, which slows down time of setting of concrete mixtures. The effect of plasticization is reduced by 60-90 minutes, and other mobile mixture is stratified, which creates heterogeneity in the designs.

Polycarboxylate - modifier adsorbed on the surface of cement grains and mineral component, which leads to higher and more prolonged plasticization. With constant stirring effect is not lost, and is extended by 3-4 times. The surface of the grains for free access of water and the reaction of hydration.

To maintain high yield and prevent stratification of the mixture should be of a certain viscosity in the mixture is introduced mineral Supplement, which is e activates the processes of hydration and increases the water holding capacity of the mixture.

Therefore, the proposed as an invention of a concrete mix using a superplasticizer based polycarboxylates developed in 2012

The technical result of the invention is to improve the quality of concrete due to its fluidity and self-packing by introducing into the composition of the concrete mix superplasticizer based polycarboxylates MC-PowerFlow 2695 at a certain composition of other ingredients.

The achievement of this technical result is ensured by the fact that "Concrete mix" includes Portland cement, crushed granite, quartz sand, microanatomical, superplasticizer based polycarboxylates and water. While it is additionally injected fly ash CHP, microanatomical - ground limestone MP-1, and as a superplasticizer based polycarboxylates MS-RowerFlow 2695, in the following ratio, wt.%:

15-18
Portland8-10
Ground limestone MP-16-8
Ash CHP GOST 25818-913-6
Quartz sand (fraction of 1.9 MK)30-40
Crushed granite fractions 3-10 mm
Crushed granite fraction 5-20 mm14-16
Superplasticizer based polycarboxylates
MS-RowerFlow 26950,0015-0,003
WaterRest

Apply ground limestone MP-1, respectively GOST in 52129-2003 - with a fineness of less than 1.25 mm

Superplasticizer based polycarboxylates, (MS-PowerFlow 2695) or (MC-PowerFlow 2695), THE 5745-168-51552155-2012, is an aqueous solution of polycarboxylate and shall comply with GOST 24211. Optimally selected mixture component proposed as the invention of concrete mixture in combination with a dosage above superplasticizer (MS-PowerFlow 2695) (0,0015-0,003) wt.% promotes self sealing concrete, without the influence of additional compactible energy independently under the influence of its own mass flows are exempt from the contained air and completely fills the space of the casing with reinforcing cage.

In many respects the properties of the resulting concrete on the basis of this superplasticizer coincide with the properties of conventional concrete. However, at the same cement content and odocument the ratio it has a higher compressive strength due to a more dense mixture. Also in the structures due to the high mobility of the mixture is more dense adhesion to reinforcement bars. This concrete has a perfectly smooth and even surface, repeating the surface casing, which gives the opportunity to use it in designs of any shape. Increased density, the absence of large pores reduces the risk of corrosion of the concrete, thus improving the quality of concrete increases its durability and ability to use concrete in aggressive environment.

A specific example of the preparation of the concrete mixture.

Consumption of materials concrete mix: wt%:

Portland cement cem I 42.5 N9
Ground limestone MP-1 GOST 52129-20037
Ash CHP GOST 25818-91 -4,5
Sand quartz sand (fineness modulus of 1.9 MCR)35
Crushed granite fractions 3-10 mm16,5
Crushed granite fraction 5-20 mm15
Superplasticizer based polycarboxylates
MC-PowerFlow 26950,00225
Water mixingRest

The above average values of the intervals of the ingredients of the concrete mix to give optimum quality characteristics shown in the table.

The qualitative characteristics of the proposed concrete mixture are summarized in table.

number ofBrand concrete waterproofingMark concrete frost resistanceStrength, MPa 7 daysStrength, MPa 28 daysRASPLAV cone, cm
1W12F30027.634.570

For the above concrete mix in the mixer dispense microanatomical - ground limestone, fly ash, power plant, quartz sand and crushed granite of both factions in conjunction with Portland cement and mix for 20 seconds. Then enter part of the mixing water and the superplasticizer is added and stirred for another 30 seconds. Additives regulating the viscosity, enter the last portion of water. Supplements are not ledue is to enter directly into the dry mixture; they need to be injected with mixing water. Due to the high efficiency of polycarboxylates you should regularly check the functioning of the dispensers. During production it is important to take into account changes in the moisture content of the aggregates, the change of particle size distribution of the aggregates and to change the order of dosing.

The resulting concrete mixture has the following advantages compared with the known brands such concretes:

1. Low water / cement ratio of 0.37 to 0.4) at high workability (RASPLAV cone to 70 cm).

2. Increase the life of the structures (increased density)

3. Failure from vibration and, consequently, reducing noise levels at the site, the reduction of energy consumption.

4. Improving the quality of the surface, does not require additional finishing, the device capability seamless durable industrial floors.

5. The increase in time of preservation mixtures, the possibility of increasing transport the mixture from the concrete node to the object.

The above test results indicate that self-compacting concrete mix according to the invention has high workability, is mobile, and the resulting concrete has a high frost resistance and water resistance, is not inferior to the known strength concretes, while supplies is on cement in the mixture is much lower.

Unlike other self-compacting concrete is still in the fact that compared to the concrete mix with high quality concrete, 60 MPa and above. The present invention was obtained concrete strength of 34.5 MPa. The proposed concrete mixture can be widely used in construction.

Concrete mix including Portland cement, crushed granite, quartz sand, microanatomical, superplasticizer based polycarboxylates and water, characterized in that it additionally contains fly ash CHP, as microsatellites - ground limestone MP-1, and as a superplasticizer based polycarboxylate - MS-RowerFlow 2695, in the following ratio, wt.%:

Portland8-10
Ground limestone MP-16-8
Ash CHP3-6
Quartz sand with fineness modulus Mto=1,930-40
Crushed granite fractions 3-10 mm15-18
Crushed granite fraction 5-20 mm14-16
Superplasticizer based on poly is carboxylato
(MS-RowerFlow 2695)0,0015-0,003
WaterRest



 

Same patents:
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FIELD: construction.

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1 tbl

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1 tbl

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3 tbl

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FIELD: construction.

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2 tbl

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2 tbl

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2 cl, 1 tbl

Building mortar // 2485067

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials and can be used as mortar for making penetrating-action waterproof coating. The building mortar contains: portland cement 25-27, alumina cement 8.1-8.3, construction sand with particle size of 0.63 mm 36.0-36.5, dolomite limestone with particle size of 100 mcm 7.9-8.3, bentonite clay additive 0.7-0.8, water 16.2-16.6, and a complex additive 4.1-4.5, with the following ratio of components of the additive, wt %: acrylate copolymer Neolith 23.5-25.5; potassium sulphate 36.0-35.5; 20% silicic acid sol solution with pH 4 38.5-39.0.

EFFECT: high adhesion strength of the waterproof coating to the surface of the concrete base and high strength of the concrete base.

1 tbl, 1 ex

Building mortar // 2485066

FIELD: chemistry.

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1 tbl

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SUBSTANCE: invention relates to the industry of construction materials and can be used in making concrete on an aggregate which contains active reactive silica. The complex organic additive contains superplasticiser S-3 and is characterised by that the superplasticiser S-3 is used in amount of 0.3% of the mass of cement and additionally contains citric acid in amount of 0.05% of the mass of cement.

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1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to composition of a complex additive for concrete mixtures and mortar and can be widely used in production of monolithic and prefabricated structures, primarily for hydraulic engineering structures and road concrete. The complex additive contains the following, (pts.wt): superplasticiser S-3 10-30, polyethylene glycol and/or propylene glycol with molecular weight of 250-3500 5-55, carbamide 10-60. In a special case, the complex additive further contains sodium formate, with the following ratio of components (pts.wt): superplasticiser S-3 10-30, polyethylene glycol and/or propylene glycol 5-55, carbamide 10-60, sodium formate 5-35.

EFFECT: high frost resistance of concrete in salts and high strength of concrete aged 28 days while maintaining and slightly improving properties, particularly cone slump.

5 ex, 1 tbl

FIELD: construction.

SUBSTANCE: invention relates to construction and may find application when a heat insulation coating is applied onto walls of industrial and civil buildings and structures. A composition for heat insulation of building structures comprises, parts: butadiene styrene stabilised latex SKS-65GP grade "B" 100, ground haydite with volume mass of 600-700 kg/m3 of fraction of 0-0.315 mm 60-75 and 0.315-2.5 mm 140-175, waste from crushing of cellular concrete of autoclave hardening of fraction 0-0.315 mm 30-36 and 0.315-2.5 mm 70-84, bone glue 0.4-0.5, gum spirit 3-5, casein glue 1-3, saponified pine tar 0.05-0.1, water 10-15.

EFFECT: increased frost resistance and weather resistance.

6 tbl, 23 ex

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