CONCRETE MIXTURE FOR ROOFING PANELS AND METHOD OF MAKING SAID PANELS Russian patent published in 2010 - IPC C04B28/08 B28B1/08 C04B111/20 

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of construction materials and specifically to composition of a concrete mixture for roofing panels and a method of making the said panels. The concrete mixture for roofing panels which contains slag portland cement, blast-furnace coarse aggregate, fine aggregate, plasticising additive, tempering liquid, contains blast-furnace coarse aggregate with particle size of 10-25 mm, the fine aggregate in form of granular blast furnace slag with particle size of 1-3 mm and the plasticising additive in form of powdered Relamix Type 2 and an additional hardening activator - fine-grained mining sand which contains 10-20% garnet mineral, an ash-slag mixture, calcium chloride, water, structured 10-15 minutes before preparation of the concrete mixture through ultrasonic treatment at 18-21 kHz, with the following ratio of components in wt %: slag portland cement 25-35, said crushed blast furnace slag 10-18, said mining sand 15-20, said sand from granular blast furnace slag 5-20, Relamix Type 2 0.1-0.2, calcium chloride 1, said tempering liquid 13-25, ash-slag mixture - the rest. The method of making roofing panels from the concrete mixture described above involves filling a mould with reinforcement and the concrete mixture, compacting for 15 minutes through ultrasonic oscillations at 18-21 kHz and ageing for 2-3 hours, with subsequent treatment by pouring water into the mould, structured through ultrasonic treatment at 18-21 kHz and hardening for 28 days.

EFFECT: increased strength and frost resistance.

2 cl, 1 ex, 2 tbl