SU1599341A1 - Method of producing concrete mix - Google Patents

Abstract

The invention relates to the production of concrete, concrete and reinforced concrete products and structures. The purpose of the invention is to reduce water absorption and increase the strength of concrete. Asbestos is treated with dimethyl dichlorosilane vapors in the amount of 50% of its initial mass and mixed with water in a dispersant to obtain a homogeneous pulp. Hydrogen chloride released in this process is treated with crushed stone, then Portland cement, sand, treated crushed stone and the remaining dimethyldichlorosilane are mixed in the concrete mixer. Asbestos-water pulp is added to the resulting composition and the mixture is stirred until uniform. The total content of the components of the concrete mix, wt.%: Portland cement 15-35

sand 30-40

crushed stone 20-30

dimethyl dichlorosilane 1-3

asbestos 2-5

water the rest. The water absorption of the concrete is 0.21-0.29%, the compressive strength after TVO is 42.4-44.5 MPa. 2 tab.

Description

The invention relates to the production of building materials, in particular to methods for preparing concrete mixes with additives and can be used in the manufacture of concrete, concrete and reinforced concrete products and structures.

The purpose of the invention is to reduce water absorption and increase the strength of concrete.

For the preparation of concrete mixtures, dimethyldichlorosilane "brands including, asbestos of brand P-3-50, aerosil according to GOST 14922-69, portland cement M500, sand with mcr 2.7 mm and crushed granite fr are used. 5-10 mm, vortex type dispersant. Dimethyldichlorosilane in the amount of 50% of the calculated amount is poured into an airtight container with a volume of 1 l. The container is heated to a muffle furnace. Then, dimethyldichlorosilane vapor is fed into the hermetic container, in which P-3-50 asbestos is placed, using connecting pipes. Pairs of hydrogen chloride from an airtight container are fed to moistened rubble. The asbestos-water mixture is passed through a VD-75 disperser with a rotational speed of 1500 rpm until a uniform pulp is formed. Then cement, agitated sand, crushed stone, and the remaining dimetypidlorosilane are mixed in a conventional type concrete mixer, and asbestos-like slurry is added to this mixture with final mixing until a homogeneous mixture is obtained.

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j The stiffness of the concrete mix is determined by a technical viscometer. Beams of size 40 "40" 160 are prepared from the concrete mix with their subsequent testing on the 28th day for compression according to GOST 10180-78 and for water absorption according to GOST 12730.3-78.

The compositions of the proposed mixtures and their physico-mechanical properties are presented in Table. 1 and 2, respectively

Claims (1)

Invention Formula A method for preparing a concrete mix, which includes treating the mineral filler with dimethyldichlorosilane  followed by mixing with portland cement, sand, rubble and water, characterized in that 1 to reduce water absorption and to increase the strength of concrete, the mineral filler — asbestos, treat with dimethyl dichlorosilane vapors in the amount of 50% of its initial mass; add water and disperse it to a homogeneous pulp, and crushed stone is treated with hydrogen chloride obtained from the reaction of dimethyl dichlorosilane and water, after which they are mixed with Portland cement; sand and with the rest of dimethyldichlorosilane, and the initial ratio of the components of the concrete mix is, wt.%: Portland cement 15-35 Sand 30-40 Crushed stone 20-30 Lima Tyldihl Orsilane 1-3 Asbestos2-5 WaterEverything Table 1 Components Content, wt.%, According to examples table 2 Continued table. 2