Derivation of Lightweight Aggregate on the Base of Fly Ash from Reftinskaya GRES

Abstract

There were considered environmental aspects of joint recovery of industrial waste from heat power engineering and metallurgy and minerals industry. There was examined influence of copper slug and hornblendite addition on physical and mechanical properties of ash cement bricks in the presence of sodium sulfate that accelerates its hardening. There was investigated possibility of use of fly ash from Reftinskaya GRES in the manufacturing of unfired fly ash aggregate (UFA), in so much as from all existing techniques of effective porous aggregates derivation of UFA is the most resources- and energy-saving solution. On the base of UFA were obtained structural concretes with strength grade B25 and B40. In such a case fly ash aggregate’s consumption in ready-mix concrete by weight was lesser by 43-58%, than stones consumption, which allows decrease density of concrete by 17-58%.