METHOD OF PRODUCING ACID-RESISTANT CONCRETE Russian patent published in 2012 - IPC C04B40/00 C04B28/26 C04B28/08 C04B111/23 

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of building 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, pre-ageing and subsequent solidification thereof, the aggregate used is screenings from grinding diabase containing 5-9 wt % powdery and clay impurities, characterised by crushing strength Cr=8, packed density ρ=1550-1700 kg/m³ and fineness modulus M_f=4.0-3.7, with the following ratio of fractions, %: 10 mm - 12.3; 5 mm - 22.8; 2.5 mm -16.6; 1.25 mm - 7.1%; 0.63 mm - 14.6; 0.315 mm - 15.1; 0.14 mm- 8.2; less than 0.14 mm - 3.3; the binder used is composite ash-alkaline binder consisting of 60 wt % field I flue ash and 40 wt% waste ash-slag mixture consisting of 17 wt % ash and 83 wt % slag, obtained from burning KATEK brown coal at Bratsk Thermal Power Plant, and liquid glass made from large-tonnage ferrosilicon wastes from the Bratsk Ferroalloy Plant - microsilica, containing 1-3 wt % ρ-SiC and 5-7 wt % C, with silica modulus n=1 and density ρ=1.30-1.45 g/cm³ with the following ratio of components, wt %: said field I flue ash 12.9-13.2; said waste ash-slag mixture 8.6-8.8; said diabase screenings 64.5-65.7; said liquid glass 12.4-14.0; the aluminosilicate component is prepared by mixed grinding in a ball mill of the ash and waste ash-slag mixture for 30 minutes to sieve No.008 residue or 0.7-0.8%; articles are moulded by vibration for 1-2 minutes, after which they are held at temperature of 18-20 C in a moist chamber for 3-6 hours, and solidification is carried out by steaming at temperature of 80-85°C and atmospheric pressure for 7 hours.

EFFECT: high acid-resistance of concrete.

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