Wall Panels From Air-Entrained Ash Slag Concrete

Abstract

The department of civil engineering of the Siberian State Academy for Mining and Metallurgy (SSAMM) together with Tom-Usinsk Precast Works have developed compositions and technology for producing a lightweight concrete based on ash and slag from Tom-Usinsk power plant. The concrete can be used for external wall panels as a replacement for claydite concrete. The ash slag blend from hydrodumps of the power plant contains 33 percent ash, 52 percent slag sand with a particle size of 0.14 to 5 mm and 15 percent slag with a particle size of 5 to 10 mm. The blend meets the requirements of Russia Standard 25592-91 for use in concretes as an aggregate. Average density of the concrete mixture was in the range of 1070 to 1150 kg/cubic meter before placing and 1100 to 1200 kg/cubic meter after placing, compacting and heat treatment, the coefficient of heat conductivity of the light-weight concrete was in the range of 180 to 250 W/m degrees Centigrade depending on average density and strength. The thickness of wall panels produced from this concrete could be reduced to 400 mm without any warm coating. The cost of 1 cubic meter of external wall panels produced from the concrete is 30 percent lower than that of panels made from claydite concrete.