CONCRETE

678.664

Steshenko, A. B. Cand. Tech. Sc., Associate Professor, Tomsk State University of Architecture and Building, Tomsk, Russia

Kudyakov, A. I. Doc. Tech. Sc., Professor, Tomsk State University of Architecture and Building, Tomsk, Russia

Alitinform No3 (52) 2018 г. 26-40 p.

Abstract

The results of studies of the effect of plasticizing and micro-reinforcing additives on the properties of cement based foam concrete mix and foam concrete of natural hardening are given in this article. It has been proposed to increase the quality of the concrete mix and hardened foam concrete by selectively affecting the cement matrix with the combined additive Relamix T2 and basalt fiber in the amount of 0.5 and 0.4 % of the cement mass, respectively. This increases the aggregative stability and reduces the plastic shrinkage of the foam concrete mix by 11 %.
In foam concrete with the combined additive, the content of closed pores increases from 22.7 to 44.9 %, the volume of open noncapillary pores decreases from 34.5 to 15.2 % and thermal conductivity by 6 %, the class of foam concrete in compressive strength rises from B1 to B2 while maintaining the average density of D500.
The developed composition of cement based foam concrete is recommended for constructing monolithic walls at a construction site or wall blocks in factory conditions for individual housing construction.

Key words:

naturally hardened cement based foam concrete, foam concrete mixture, modifying additives, plasticizer, micro-reinforcing fibers, preparation technology, aggregative stability and plastic shrinkage of the mixture, strength, porosity and thermal conductivity of concrete

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