SU1652318A1 - Process for preparing cellular concrete mix - Google Patents

Abstract

The invention relates to the building materials industry, namely to the manufacture of products from autoclaved cellular concrete, and concerns a method for preparing a cellular concrete mixture. The purpose of the invention is to increase the strength of cellular concrete at its high operating humidity. In the method of preparation of a concrete mixture, which includes mixing cement, lime-sand in a tinder, obtained by dry grinding of lime and quartz sand, sludge, obtained by wet grinding of the silica component and fly ash. aluminum powder, in the process of dry grinding of lime and quartz sand, additional waste of production of ferrosilicon is introduced in the amount of 5–30% by weight of lime. Cellular concrete with a density of 500–600 kg / m3 at a moisture content of 25–40 wt.% Has a compressive strength of 1.9–3.1 MPa. 1 tab. Yo

Description

The invention relates to the building materials industry, in particular to the manufacture of products from autoclaved cellular concrete, and concerns a method for preparing a cellular concrete mixture.

The purpose of the invention is to increase the strength of cellular concrete at its high operating humidity.

In the process of preparing lime-sand to tense (IPV) by joint dry grinding of lime and quartz sand, additional waste of production of ferrosilicon (OPF) in an amount of 5-30% by weight of lime is introduced. Due to this, in IPV, a mixture of lime particles has a characteristic inhomogeneity size of 0.1 - 1.0 μm, whereas in the known method it is 10 - 100 μm.

To prepare a concrete mixture, components are used in the following ratio, wt%: cement 9-15; lime 9-15; quartz sand 30 - 40; fly ash 6-14; OPF 0.45-4.5; aluminum powder 0.04 - 0.08; water the rest (up to 100%).

Example. 450 g of lime, 425.5 g of sand and 22.5 g of OPF are ground dry in a laboratory ball mill to obtain an IPV with a specific surface of 6000 cm / g. 1574.5 g of sand, 700 g of fly ash and 1377.5 g of water are loaded into a laboratory mill and grinding is carried out to obtain a slurry with a specific surface of 2500 cm2 / g.

Then in a turbulent mixer, mix the helmet, cement, IPV and aluminum powder for 3 minutes. The concrete mixture is molded into samples of 0.1x0.1x0.1 m, which are autoclaved at an overpressure of 1.0 MPa.

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For co-production, a concrete mixture is made from the same components by a known method, and according to which dry grinding of IPV is carried out without the use of OPF.

The test results are presented in the table.

Analysis of the obtained data shows that the proposed method, in comparison with the known, allows to obtain cellular concrete at high operating humidity with increased compressive strength 1.5–1.9 times, which ensures a 2–4 times reduction in cement consumption when obtaining equal strength concrete.

Claims (1)

The invention of the method of preparation of a chemo-concrete smzsi, including the mixing of cement, joints and sands into a binder, dry grinding of lime and quartz sand, sludge obtained by wet grinding of the silica component and fly ash, and aluminum powder, distinguished by the fact that increasing the strength of the cellular bune when e-o is high in operating wetness; in the process of dry grinding of lime and quartz sand, waste of ferrosilicon production in the amount of 5–30% by weight of lime additionally introduces.