Some aspects of improvement of physical and mechanical characteristics and regulation of porosity indicators of heat-insulating foam- and fiber foam-concretes

The article presents the results of a series of experimental studies aimed at obtaining heat-insulating foam concrete and fiber concrete with improved physical and mechanical properties due to the selection of a rational amount of fiber and the use of low-energy-intensive activation by variable electrophysical effects, as well as the study of porosity indicators of heat-insulating foam and fiber foam concrete under the influence of activation. The most rational amount of fiber was selected as a percentage of the binder mass 4. At this degree of reinforcement, the most positive effect is observed from the electrophysical activation of fiber-rein-forced concrete, and the physicomechanical properties of the material have the greatest values. It was found that low-energy electrophysical activation leads to an insignificant (up to 5%) increase in the total porosity of foam and fiber concrete. At the same time, open capillary porosity decreases by 12-20%, which indicates hardening of interpore partitions of foam and fiber foam-concrete, while the density remains almost unchanged. The study of total and differential porosity confirmed the fact of a decrease in the open capillary porosity of foam and fiber concrete as a result of low-energy electrophysical activation.