The article considers influence of nature and amount of foaming agent on stability, multiplicity, strength and coefficient of foam use and also heat conductivity and strength of non autoclaved foam concrete.

The article deals with the influence of microsilica on technological properties of cement matrix and finished foam concrete. The possibility of replacing a part of the binder with microsilica was evaluated.

Main defects and damages of building structures made of fine-sized elements are considered.

The article considers the problems of monolithic house building in Russia. The version of design of cellular concrete compositions based on assessment of water-solid ratio (W/S) and determination of optimal content of plasticizers of the new generation is proposed. It has been found that in order to obtain heat-insulating cellular concrete, the range of W/S is in the range from 0.35 to 0.5, and the percentage of plasticizer is up to 0.5 of the weight of binder.

The article deals with different options for strengthening node of connection of floor slabs with racks in systems with without a crossbar framework. Modeling of the strengthened nodes in the environment of SCAD has been made, the analysis and comparison of numerical calculation data to select the most rational option of strengthening is carried out.