BINDING AGENT FOR CONCRETE OR CONCRETE MORTAR, METHOD OF PRODUCING DENSE CONCRETE AND CONCRETE Russian patent published in 1997 - IPC

FIELD: manufacture of building materials. SUBSTANCE: binding agent contains Portland cement and 5- 40% (based on weight of Portland cement) ashes from burning grain waste containing 60-95 wt % silicon dioxide in which amorphous portion constitutes at least 90%, particles larger than 75 mcm in size constitute at least 10%, 4-75-mcm particles at least 75%, and those with size at least 6 mcm, from laser light scattering data, possess specific surface with regard to nitrogen adsorption at least 20 sq.m/g. Portland cement may be of puzzuolanic type. Average size of ashes ranges from 6 to 38 mcm. Concrete is prepared by mixing above- described binder with fine and coarse fillers and water followed by hardening. Chloride and water permeability of thus prepared concrete is low. EFFECT: improved performance characteristics of concrete. 16 cl, 9 tbl, 6 dwg