Method of preparing construction mixture

FIELD: chemistry.

SUBSTANCE: invention relates to preparation of construction mixtures, primarily fine-grained concrete mixtures and mortars which harden in natural conditions or under steam curing. Disclosed is a two-step method of preparing a construction mixture using mineral filler, a plasticising additive, sand and binder. The first step comprises mixing the binder - portland cement M500 D20, mineral filler - silicon carbonate gaize, 55-65% sand and 60-70% hardening water to obtain a homogeneous mixture, and the second step comprises adding to the obtained mixture the remaining sand, plasticising additive - superplasticiser SP-1 and the remaining water, and finally mixing to obtain a homogeneous mixture of given workability.

EFFECT: reducing consumption of expensive materials without reducing strength of the obtained material.

1 tbl

 

The invention relates to a process of making mixes, mostly fine-grained concrete mixes and mortars, hardening under natural conditions or under heat and moisture treatment.

The main disadvantage of the traditional method of making fine-grained mixtures is the increased consumption of cement.

Widely known method of preparing fine-grained mixtures with mineral fillers, such as fly ash, limestone powder, sand introduced into the mixture to conserve cement (Y. Bazhenov M concrete Technology. - M.: Higher school, 2003, S. 287).

The disadvantage of this method of making fine-grained mixtures is their high water associated with high dispersion of mineral fillers and contributing to increased consumption of cement.

To reduce water demand fine-grained mixtures of dispersed fillers used plasticizing agents.

A known method of preparation of the concrete mixture (patent RU 1760981 A3, SW 40/00, 07.09.1992,, bull. No. 33), according to which the process of making concrete mixture includes mixing in high-speed turbulent mixer of cement, filler, water, and complex chemical additives containing superplasticizer MT-AR and nitrate of sodium or calcium, mixing obtained is mixed with fractionated quartz sand in a low-speed mixer until smooth. In this first mix in high-speed turbulent mixing of the water with filler is a highly active silica fume with a specific surface area (20-40)103cm2/g, then give three fractions of quartz sand with a module size of 2.2-2.5; 1.0 to 1.5 and 0.05-0.5 and mix with water and a filler, after which the mixture is injected comprehensive Supplement with electrolyte and conduct final mixing in a low-speed mixer.

The method provides high strength properties of fine-grained concrete, but complex in execution, which limits its wide application.

Closest to the claimed technical essence is a way of preparing the mixture (see patent RU No. 2373171 C2, SW 40/00 published 20.11.2009,).

This method includes two stages of preparing a fine-grained mixture of: at the first stage receives a mixture consisting of mineral fillers, plasticizing agents, sand and water, and the second stage to the resulting mixture add astringent and do the final mixing.

The disadvantage of this method is the increased consumption of cement and plasticizing agents.

The objective of the proposed invention is to reduce the consumption of expensive materials.

The invention consists in that in the method of preparation of the straw is tion mixture, includes two stages, with the use of mineral fillers, plasticizing agents, sand and binder, on the first stage of the mixed binder is Portland cement M500 D20, mineral filler - carbonate-siliceous flask, 55-65% sand and 60-70% of the mixing water to obtain a homogeneous mixture, and the second stage to the resulting mixture add the remaining sand, plasticizing additive - superplasticizer SP-1 and the rest of the water,and finally mix them until a homogeneous mixture of a given workability.

As a mineral filler used crushed carbonate-siliceous flask.

As plasticizing agents used superplasticizer POLYPLAST SP-1.

The technical result will be a reduction of 15% of cement consumption and 25% plasticizing agents without compromising the strength of the material obtained.

The result is achieved that the method of preparation of mixes, including two stages of mixing of the components in the first stage mix binder (Portland cement M500 D20 (GOST 10178-85*) Circassian cement plant, mineral filler (carbonate-siliceous flask), 55-65% sand and 60-70% of the mixing water, and the second stage to the resulting mixture add the remaining sand, superplasticizer POLYPLAST SP-1 istalol water, then finally stirred until a homogeneous mixture of a given workability.

Mortar according to the invention is prepared as follows. In accordance with the formulation is dosed by weight and loaded into the mixer Portland cement, mineral filler (carbonate-siliceous flask), 55-65% sand and 60-70% of the mixing water. These components are mixed until a homogeneous mixture. In the second stage metered and added to the mixer the remaining sand, superplasticizer and the rest of the water, followed by final mixing of all components until a homogeneous mixture of a given workability.

Introduction in a mixture of superplasticizer POLYPLAST SP-1 with a part of the mixing water in the second stage allows without deterioration of the workability of the mixture to reduce dosage of the additive and to reduce the consumption of binder (Portland cement) without reducing the strength of the material obtained.

The invention is illustrated by the following example.

For implementing the method using the following materials:

1. Portland cement M500 D20 (GOST 10178-85*) Circassian cement plant.

2. River sand for construction works (GOST 8736-93) liventsovskaya substation field with a module size of 1.32.

3. Superplasticizer - POLYPLAST SP-1 (TU 5870005-58042865-2005).

4. Mineral filler is crushed to a full pass through sieve No. 008 carbonate-siliceous flask Maslovsky Deposit. This flask has a light yellow color. The rock is dense, with signs of stratification, microporous. With a gentle kick breaks the plane of deposition. The average density of 1.35-1.55 g/cm3true of 2.45-2.55 g/cm3. When wet strength properties of rocks greatly reduced. The fracture pluralistic. Reacts with 10% hydrochloric acid. In the water do not soak. The bulk of the rock is composed of opals colloidal-fine-grained structure. Terrigenous melkorazdroblennuyu material submitted by the acute-angled beans and slabokislogo quartz size of 0.01-0.05 mm in an amount of about 10%. The carbonate component is represented mainly organic and pelitomorphic calcite. As a small impurities are grains of pyrite (0.04 to 0.07 mm), also observed Slovenie units and lamellar crystals with a pearl sheen similar to group minerals zeolites.

For the preparation of mortars method proposed in the mixer is metered in accordance with the recipe and download 55-65% sand, Portland cement, mineral filler - carbonate-siliceous flask and 60-70% of the mixing water, then stirred until homogeneous, MESI. In the mixture entering the remainder of the sand, superplasticizer POLYPLAST SP-1 and the rest of the water, followed by final mixing until a homogeneous mixture of a given workability.

To obtain comparative data also prepare mortar for the prototype method: in the first stage receive a mixture of fillers, plasticizing agents, sand and water, and the second stage to the resulting mixture add cement and finally mix them.

Cooked easily workable mixtures (repliva cone on a standard shaker table 110 mm) made samples-balocchi size 4040160 mm curing 28 days in normal conditions with heat and moisture treatment (TWT) after a two-hour pre-exposure mode 2+6+2 at a temperature of isothermal aging at about 85C. the Cured samples are subjected to strength tests of the conventional methods.

The mixes prepared with the compared methods, and the results are given in the table.

Analyzing the table presents the test results, we can conclude that the boundary limits of the flow of sand in the first stage of the mixing process are 55-65% of the total consumption in the mixture, and limits the flow of water mixing in the first stage - in the range of 6070% of the total consumption for cooking mixture (compositions No. 3, 4, 5). Going beyond the specified limits as in most (composition No. 2) and lower side (part No. 5) reduces the strength characteristics of the material obtained.

The test results shown in the table, indicate that the proposed method provides the possibility of reducing the consumption of Portland cement by 15% and superplasticizer POLYPLAST SP-1 by 25% without a decrease in strength as compared with the known method.

Method of preparation of mixes, including two stages, with the use of mineral fillers, plasticizing agents, sand and a binder, characterized in that the first stage mix binder is Portland cement M500 D20, mineral filler - carbonate-siliceous flask, 55-65% sand and 60-70% of the mixing water to obtain a homogeneous mixture, and the second stage to the resulting mixture add the remaining sand, plasticizing additive - superplasticizer SP-1 and the rest of the water and finally mix them until a homogeneous mixture of a given workability.



 

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3 ex, 1 tbl

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5 cl, 1 ex, 1 tbl

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3 cl, 1 tbl

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4 tbl

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2 tbl

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EFFECT: the invention ensures production of the items with a high strength, life duration, frost-resistance, increased chemical durability, watertightness, cement saving due to substitution of its optimum amount for microsilica.

2 cl, 3 tbl, 1 ex

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