SU1721036A1 - Concrete mix - Google Patents

Abstract

The invention relates to the construction and can be used for the preparation of lightweight concrete. The concrete mixture contains, wt%: Portland cement 5-8; gravel and sand from porous rocks 70-71; activated ash from thermal power plants 7-10; activated carbonate dust of porous rocks 1.8-2.4; activated citrate calcium citrate (FCC) - waste production of citric acid 0.08-0.5; water - the rest. Concrete mix is prepared according to the following technology. The ash of water removal, dust of carbonate sedimentary rocks and the addition of FCC in the form of a water-carbonate suspension with a T: W ratio of 1: 1 is subjected to activation in a rotary pulsation apparatus for 1 minute. Mix the water-carbonate slurry in the presence of the FCC additive with cement and other components of the concrete mix in the concrete mixer. At the end of mixing these components, the quantity of water that is missing in calculation is introduced into the prepared mixture, the strength of concrete is 30.1-34.0 MPa, the time of heat and moisture treatment is 12 hours. 4 tab. (Ls

Description

The invention relates to the construction and can be used for the preparation of lightweight concrete.

A concrete mixture is known that includes stagnant, crushed stone and sand from sedimentary rocks, and water at the following ratios, wt%:

10,7,7

Rubble and sand from porous rock 70,0

WaterEverything

The disadvantages of the concrete mix include high cement consumption, low compressive and flexural strength of concrete.

8.0

Closest to the proposed concrete mix is a concrete mix, including Portland cement, crushed stone and sand of sedimentary rocks, fly ash TPP and water in the following ratio,, wt.%:

Portland cement Rubble and sand from porous rocks71,0

Ash from thermal power plants9.0

WaterEverything

The disadvantage of this concrete mix is that, when the cement consumption is too high, the concrete strength is insufficient

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compression and bending, long concrete pre-curing time and slow curing of concrete samples during heat treatment.

The purpose of the invention is to increase the strength of concrete and reduce the time of heat and moisture treatment.

The goal is achieved by the fact that the concrete mixture contains, wt.%:

Portland cement5-8

. Rubble and sand from porous rocks-70-71

Activated ash from power plants7-1-0

Activated carbonate dust of porous rocks1.8-2.4

Activated filtrate - calcium citrate - waste of citric acid production 0.08-0.5

WaterEverything

The amount of rubble and sand in the aggregate is, wt.%: Crushed stone 47-51, sand 20-23. It is possible to use limestone for shell-porous rocks, limestone wastes. The chemical composition of porous rocks is presented in table. 1, the mineral composition in table. 2, the chemical composition of carbonate dust - in table. 3

The chemical composition of waste production of citric acid, calcium citrate filtrate is represented by the following ratio of components, wt.%:

Slurry citragypsum85-95

Two-water gypsum3-9

Calcium oxalate 0.2-0.7

Berminska azureEverything else

In the proposed concrete mix, Portland cement M-500, carbonate crushed stone and limestone sand, ash-hydro removal of the heat and power plant with an initial specific surface area of 2200 cm2 / g and carbonaceous residue content that meets their requirements, according to GOST; Waste from citric acid production — filtrate calcium citrate and carbonate dust.

Zod a-hydro removal together with carbonate dust in the presence of an additive of calcium citrate filter (FCC). subjected to hydrodynamic activation in a rotor-pulsation apparatus (RPA) for 1 minute. The result of the treatment is a more complete disclosure of the active surface of the ash-removal and carbonate dust particles. The introduction of activated fine-grained carbonate rocks into the composition creates conditions for involvement in

hardening of the aluminate and aluminosilicate additives and accelerates its hardening. Under conditions of normal hardening or hydrothermal treatment, the formation of calcium hydrocarbonic aluminates occurs, which confirms the interaction of the ashcarboaluminate additive with Portland cement.

The concrete mix is prepared as follows.

Example. A suspension of ash from the TPP with carbonate dust and citric acid production waste F CC (in the ratio of solid (T) and liquid

5 (G) T: W 1: 1 and is treated in the RPA at a rotor speed of 3000 rpm. Processing time 1 min.

Displacement of water-carbonate suspension treated in the presence of

0 FCC in RPA, with cement is produced directly in the concrete mixer simultaneously with the other components of the concrete mix.

At the end of mixing these

5 components in the prepared concrete mixture enter the missing by the calculation of the number. water quality.

In tab. 4 shows the compositions of the known and proposed concrete mixes, as well as

0 physical and mechanical properties of concrete based on these mixtures.

Analysis table. 1. shows that concretes prepared on the proposed formulations with the specified ratios

5 components, in comparison with the control composition (with the use of non-activated ash), an increase in compressive strength of 50-74% is achieved while reducing the consumption of a live agent by 12-50%.

0 The use of the proposed concrete mix in comparison with the known allows to reduce the consumption of the material and increase the strength of the resulting building materials, as well as reduce the mode

5 heat and moisture treatment.

Claims (1)

Invention Form Concrete mixture, including Portland cement, activated ash of thermal power plants, crushed stone and sand from porous 0 rocks and water, characterized in that, in order to increase the strength of concrete, reduce the time of heat and moisture treatment, it additionally contains activated carbonate dust of porous 5 rocks and activated filtrate - calcium citrate - waste production of citric acid in the following ratio, wt.%: Portland cement5-8 Rubble and sand from porous mountain rocks70-71 Activated ash thermal power 7-10 Activated carbonate dust of porous rocks 1.8-2.4 Activated filtrate calcium citrate - waste production of citric acid Water Table 1 table 2 Table 3 Table 1