Optimization of the composition of hydrophobized cellular concrete according to its moisture-transporting and water-holding characteristics

Abstract

The article is devoted to the study of the possibility of obtaining information about frost resistance and strength of concrete based on the analysis of its moisture-transporting and equilibrium water-holding properties. The dependences of the moisture diffusion coefficient, equilibrium moisture content at various values of relative humidity and porosity of autoclaved cellular concrete specimens on the concentration of water-repellent additive were studied. A comparison of the results of these measurements with the data on frost resistance, got by the direct method according to the current standards, have been made. It is shown, that moisture-transporting and water-holding characteristics can be used to assign concrete compositions optimal in frost resistance and strength. The mechanisms of the influence of water repellent on the frost resistance at its various concentrations are considered. It has been established that the composition of cellular concrete containing 2% water-repellent additive is optimal.

Review of selected aspects of shaping of physical, mechanical and thermal properties and manufacturing technology of lightweight and ultra-lightweight autoclaved aerated concrete

“…The dependences of moisture diffusion coefficient at different values of relative air humidity and porosity of samples of autoclaved aerated concrete on the concentration of water-repellent additives were investigated and presented in [35]. It is shown that water retention characteristics can be used to determine the frost resistance of autoclaved aerated concrete.…”