Physical and mechanical properties of non-autoclaved ash-porous concrete

The paper discusses the principles of low-energy technology of non-autoclaved porous concrete (NAPC) based on fuel-burnt ash. After mixing with water and mixing in a conventional mixer, the raw mixture is put into molds or formwork, where it swells and then hardens under normal conditions or with a slight heat treatment. The use of NAPC with the same average density as conventional light concrete on firing aggregates for reinforced load-bearing structures can be justified by close values of total porosity and related indicators of elastic and deformative properties, as well as similar working conditions of reinforcement in these products. At the same time, in comparison with gas – reinforced concrete, NAPC favorably differ in greater stability of properties during manufacture, lower consumption of gas-forming additives, and in comparison with conventional light concretes-the absence of expensive large porous aggregates. The strength and deformative characteristics of NAPC are determined both under short-term and long-term loads, which is the basis for further research of the use of this promising material in load-bearing and enclosing structures.