Laboratory studies to assess the effect of modified additives on the quality of aerated concrete

Abstract

The proposed method of production of composite aerated concrete using industrial wastes: ash from hydrotreatment, post-alcoholic bard. The evaluation of physical and mechanical properties of gas concrete produced by the proposed technology is made in comparison with other technologies, including the classical production technology. The basic estimated parameters, were: terms of setting and strength of a binder; durability, water absorption and thermal conductivity of a material. The obtained test results of the binder showed a decrease in the setting time and an increase in the strength of the proposed aerated concrete compared with other, compared samples. The obtained results of water absorption of the proposed aerated concrete showed minimum values, and the strength maximum (compared with other technologies), which indicates a positive synergy effect, i.e. strengthening the qualities of the material as a result of mutual work of the post-alcoholic bard and polymer component in the composition of the material. However, the results of the thermal conductivity of the proposed aerated concrete showed values lower than the classical one, indicating that the use of modifier additives cannot be a good solution for improving the physical and mechanical properties of gas concrete structurally related to thermal insulation. In general, the results of water absorption, strength and thermal conductivity showed more consistent results (compared to other technologies), with minimal variation in the data, which indirectly confirms the better homogeneity of the proposed gas concrete.