RU2593509C1 - Composition of mixture for production of unfired fly-ash aggregate - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to industry of construction materials, particularly to production of aggregates for light concrete. Mixture for production of unfired fly-ash aggregate contains, wt%: hydro-removal ash 75-80; liquid glass 6.5-8; portland cement 3-5; water - balance.

EFFECT: low packed density of unfired gravel.

1 cl, 3 tbl

Description

The invention relates to the building materials industry, in particular to the production of aggregates for lightweight concrete.

A known mixture for the preparation of non-fired ash gravel based on acidic ash of TPPs (Patent No. 2526925, IPC С04В 18/10, IPC С04В 18/14, publ. 08/27/2014), containing, by weight. %: quicklime 5-15; anhydride 5-15; hardening accelerator - steel-refining slag, milled to a particle size of less than 100 microns 5-50; acid ash TPP - the rest.

The disadvantage of this mixture is the increased density.

Closest to the invention is a mixture for the preparation of non-calcined ash gravel (Patent No. 2482091, IPC С04В 18/10, publ. 05/20/2013), containing, by weight. %: Portland cement 15-20; ground blast furnace granulated slag 0-25; sodium sulfate 2; hornblendite - 10-25, acid ash - the rest.

The disadvantage of this mixture is the increased density.

The technical result is to obtain a mixture to obtain annealed gravel with a reduced density.

The technical result is achieved in that the mixture for the preparation of non-fired ash gravel, including ash, Portland cement, water, according to the invention additionally contains liquid glass in the following ratio, wt. %:

water removal ash 75-80;

liquid glass 6.5-8;

Portland cement 3-5;

water the rest.

Hydroelectric removal ash of the CHPP is a fine powder with a fineness of grinding of 2500-3000 cm ² / g, bulk density of 780 kg / m ³ , true density of 2200 kg / m ³ , moisture content of 17%, 4.8% loss on ignition.

The grain composition of the hydro-removal ash of a wet-fired CHPP is presented in Table 1.

The fineness modulus of hydropower removal ash from a thermal power station is M _cr = 1.02.

The chemical composition of the hydropower ash of a thermal power plant is presented in table 2.

The hydropower ash of a thermal power station in a mixture is the main component. This ash is low-calcium, therefore, it has weak binding properties. For the formation of granules, the introduction of an additional component is necessary.

Liquid sodium glass acts as a binder, necessary for granulating ash. The main task of the liquid stele is to replace cement in similar compositions of ash gravel. Due to the rejection of the use of cement, the bulk density of the granules decreases. It is introduced with water.

Portland cement plays the role of an additional binder necessary to achieve the required strength of the granules.

The preparation of the test granules was carried out in a laboratory dish-shaped granulator. All components were dosed by weight.

The strength gain of the granules occurred for at least 3 days.

The compositions for the preparation of granules are shown in table 3.

Table 3
The compositions of the initial mixtures. Components Content, wt. % Composition No. 1 Composition No. 2 Composition No. 3 Liquid glass 6.4 7.9 7.2 Thermal Power Plant Ash Removal Ash 76.6 78.3 78,2 Portland cement 3.6 4.4 5,0 Water 13,4 9,4 10.6 The bulk density of the granules, Mkg / m ³ no more than 510 no more than 490 no more than 515 Prototype (Patent No. 2526925, IPC С04В 18/10, IPC С04В 18/14, published on 08.27.2014)
The bulk density of the granules, kg / m ³ not less than 640 not less than 640 not less than 640

Thus, the replacement of cement with liquid glass leads to a decrease in the bulk density of the granules.

Claims (1)

A mixture for the preparation of non-calcined ash gravel, including ash, Portland cement, water, characterized in that it further comprises liquid glass in the following ratio of components, wt. %:
hydraulic ash 75.0-80.0 liquid glass 6.5-8 Portland cement 3-5 water rest