METHOD OF PRODUCING POROUS AGGREGATE Russian patent published in 2013 - IPC C04B20/10 

FIELD: chemistry.

SUBSTANCE: invention relates to production porous aggregates for concrete. In the method of producing porous aggregate, involving preparation of a ceramic casting mixture, immersing porous particles into the mixture, holding said particles in the mixture until formation of a layer, drying and firing, particles with size of 40-70 mm are used, said particles being obtained by grinding spent gypsum or phosphogypsum moulds for moulding porcelain and faience articles. The method involves holding particles in the mixture until formation of a 1-5 mm thick layer on the particles.

EFFECT: obtaining porous aggregate with an uneven surface which ensures strong adhesion with hardened cement paste.

2 cl, 4 ex