SU1662987A1 - Method of producing light concrete mix - Google Patents

Abstract

This invention relates to a technology for producing building products and structures from concrete mixtures. The aim of the invention is to reduce the consumption of cement, improving the homogeneity of concrete. Water removal ash with natural moisture is mixed in mixers with an aqueous solution of stimulating additives, for example, NOC (calcium nitrate, nitrite), in an amount of 0.5–1.0% of the dry ash weight at a water-bearing ratio of suspension 0.6–0, 65 for 1.0-1.5 minutes, after which the resulting ash slurry is mixed with the remaining components until uniform. 1 tab.

Description

This invention relates to a technology for producing building products and structures from concrete mixtures.

The aim of the invention is to reduce the consumption of cement and improve the homogeneity of the concrete.

Example. For testing use ash GRES, expanded clay gravel, cement Portland M400.

The ash of SDPP refers to acidic products, its chemical composition is as follows, wt%: SI02 59.3-63.9; AlaOa 20.7-20.8; Re20z6.2-8.1; CaO3, 6-4.3; MgO 2.0-2.2; 50s 0.1-0.3; No. 200.2-1.6; K20 0.8-3.3. ppt 3.2-5.0.

Ash is finely dispersed, represented by 92-95% particles less than 0.14 mm. The specific surface is 280-291 m / kg. The bulk density in the dried state is 850-900 kg / m, natural humidity is 25-34%, Zola meets the requirements of GOST 25592-83.

Expanded clay with a bulk density of 550-600 kg / m. compressive strength 1.8 MPa, which is lower than the established requirements of GOST 9759-83.

The grain composition of the filler was selected with the least voidness. For testing use the following optimized composition of concrete

workability mixture of 8-10 cm,

Grade B 3.5, kg / m3:

gravel fraction of 10-20 mm360;

expanded clay sand180;

cement160;

ash200;

water275

calcium nitrate (NNC)

The ash is mixed with 0.03, 0.05, 0.07, 1.0, and 1.5% NNK for an O.5, 1.0, 1.5, and 2 min at B / 3 055, 0.6, 0.62, 0.65 , 0.7 in a paddle mixer, foam concrete mixers, and then mixed with expanded clay gravel, cement and water

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The test results are shown in the table.

Claims (1)

The invention method of preparing a lightweight concrete mixture, which includes a two-stage mixing of aggregate, cement, ash, water and additives, characterized in that, in order to reduce cement consumption, improve the homogeneity of concrete, reduce efflorescence, first the ash of hydraulic removal with natural humidity is mixed with the addition of nitrate - calcium nitrite in the amount of 0.5-1.0% by weight of dry ash at a water-to-ash ratio of 0.6-0.65 for 1.0-1.5 min, and then mixing with the other components is carried out.