METHODS OF PRODUCING CELLULAR CONCRETE USING FLY ASH

Abstract

The fly ash from power plants is a man-made raw material for many industries. It is utilized up to 92% in dry form and is of practical interest in the production of effective thermal insulation building materials and products as a filler and aggregate. The feasibility of producing non-autoclave gas-ash slag concrete using cement with an increased content of highly basic minerals - alite and tricalcium aluminate - has been proven. The technology of obtaining ash-alkali cellular concrete using fly ash and an alkaline component is presented. The economic efficiency of cellular ash-intensive concretes is justified by the replacement of sand with ash, and a 1.2-1.5 times less in lime consumption compared to lime-sand concrete, as well as approximately 2 times less in capital costs for the extraction and processing of raw materials. Comparative physical and mechanical properties of autoclaved and non-autoclaved aerated concrete products are presented. The process of manufacturing products by vibrovacuuming and vibrocompaction of ash concrete is shown. The presented data show that the strength of vacuum ash concrete is 30-40% higher than that of vibration-compacted concrete with a rigid mixture.