Research of structuring processes of non-autoclave foam concrete with introduction of mineral additives

Abstract

The article is concerned on the ways of improving the quality of non-autoclaved foam concrete. The effective method is the use of fibrous additives that provide reinforcement of the material structure. It is noted that the use of basalt and glass fiber, fine additives of wollastonite and diopside increases the aggregate stability of the foam concrete mixture. In this case greater extent is when introducing mineral additives. This reduces the density of the material to D300 and D400 as well as the thermal conductivity coefficient to 0.069-0.097 W/(m•°C). It was found that wollastonite and diopside additives in comparison with fiber one provide greater adhesion to cement stone. Introducing the proposed additives reduces the plastic shrinkage of foam concrete samples by 15.6-20.8% with the introduction of mineral additives and 59.2-61% with the introduction of fiber. The shrinkage on drying is reduced with the introduction of mineral additives in foam concrete by 23-35% and with the introduction of fiber shrinkage reduction is not observed. The use of mineral additives, such as wollastonite and diopside, allows improving the quality of foam concrete products due to increased air entrainment, the formation of optimal porosity, more complete hydration of the minerals of cement stone and a better adhesion of additives with cement stone.