METHOD OF PRODUCING ACID-RESISTANT CONCRETE Russian patent published in 2013 - IPC C04B40/00 C04B28/26 

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of structural materials and can be used when making construction products and structures from acid-resistant concrete. In the method of producing acid-resistant concrete, involving preparation of an aluminosilicate binder component, feeding an aggregate and binder components, mixing, moulding articles, ageing and subsequent solidification thereof, the aggregate used is a waste ash-slag mixture from Irkutsk TPP-6, Bratsk, with packed density ρ=1200-1450 kg/m³, grain size of 0.315-10.0 mm and moisture content of 1-1.5%, with the following ratio of grains of fractions, %: 10 mm - 9.9; 5 mm - 49.6; 2.5 mm - 10.2; 1.25 mm - 13.9; 0.63 mm 10.6; 0.315 mm - 5.8; the binder used is alkaline-ash binder consisting of 35 wt % field I flue ash and 65 wt % field II flue ash, obtained from burning Kansk-Achinsk brown coal at TPP-7 Bratsk, Irkutsk region, and liquid glass made from large-tonnage wastes from production of ferrosilicon at the Bratsk Ferroalloy Plant - microsilica, consisting of 10-15% crystalline and 85-90% amorphous component, with silica modulus n=0.9-1.5 and density ρ=1.3 0-1.42 g/cm³, with the following ratio of components, wt %: said field I ash - 7.30-7.50; said field II ash - 13.05-13.90; said liquid glass - 14.40-16.70; said ash-slag mixture - 62.50-64.20; preparation is carried out by grinding the aluminosilicate component in a ball mill for 15 minutes; the articles are moulded by vibration, after which they are held for 3 hours at temperature T=18-22°C, and solidification takes place in a steam treatment chamber at temperature T=85-90°C in a 2+4+2 hour mode.

EFFECT: low steam treatment temperature of articles and faster solidification, wider range of crude components.

6 tbl