Strain-Stress Distribution of Structural Components from Foam Concrete for Monolithic Construction

Abstract

The problem of use of hi-tech macroporous concrete in load-carrying structures of low-rise buildings is designated and the forthcoming research problems of power resistance and deformation of the compressed and bent elements from foam concrete of natural solidification are formulated. Results of pilot researches of intense state of strain of the compressed and bent elements from foam concrete of average density of 1200-1600 kg/m3 of different structural modification in the conditions of short-term and long action of loading are provided. It is established that foam concrete meet for nonrigid indicators regulatory requirements and take the intermediate place between full-strength cellular and light concrete on expanded aggregates that creates premises for their successful application in the bearing concrete and reinforced concrete constructions. Deformation and strength characteristics of foam concrete of different structural modifications taking into account the impact of the long processes caused by solidification of concrete and external power factors, necessary for calculation and structural design are offered. The received results of researches will allow to project rationally bearing and enclosing structures from foam concrete that leads to increase in technological level of monolithic construction.

Mechanical properties of porous concrete during compression

“…And only near the moment of loading the samples nonlinearity appeared at lower voltages and completely disappeared after 1.5-2 weeks of exposure to load. It is important to clarify that due to the increase in concrete strength over time since the beginning of the observation, the actual ratio of stresses in the samples to the ultimate strength /Rb decreased and, as a consequence, the transition boundary of the linear region decreased creep into nonlinear [10].…”