Water absorption of cellular concretes made on the basis of technogenic raw materials

The article presents a comparative analysis of water absorption of non-autoclaved foam concretes based on microsilica and autoclaved aerated concretes based on fly ash. It is experimentally established that the water absorption by mass of foam concrete the grade D500 is 19.6 % higher than that of aerated concrete of the same grade. Open porosity, which is numerically equal to water absorption by volume, is also higher for non-autoclaved foam concrete by 30.1 %. Closed porosity for autoclaved aerated concretes based on fly ash the grade D500 is 53.9 % higher compared to non-autoclaved foam concrete of the same grade. The dependences of open and closed porosity of cellular concretes based on technogenic raw materials on their average density are experimentally derived. In the course of research, it was determined that water absorption, open and closed porosity of cellular concretes at the same average density depends on the type of aggregate and on the hardening conditions.