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Investigation on the influence of the dispersion of gas concrete components on main construction properties
Authors: А. Saley, A. Sigunov, T. Kravchenko, L. Khmarska
Number of views: 428
In the present work we investigated the effect of the dispersion of raw mix components on the construction properties of lightweight concrete. Such concrete is often used in the manufacture of gas concrete using the wastes of Pridneprovsk region companies, including granulated blast-furnace slag and flue ash of thermal power plants. The compositions of cellular concrete with different components dispersity were formed and an analysis was made to determine the rational values of the fineness of grinding of the components in the raw mix. The formation of a defined fraction of individual materials was established to occur according to an individual scheme. Thus, the specific surface area of fine fractions (less than 0.14 mm) increases in the following range: sand, cement, granulated blast furnace slag, and lime. However, for crude fractions, this sequence is as follows: sand, granulated blast furnace slag, cement, and lime. In order to optimize the characteristics of dispersed raw mix, a simplex-lattice method of experiment planning was used. The research results showed that the main construction and technical characteristics of cellular concrete are mainly associated with the values of the fineness of grinding of each component of the composition. The analysis of the results revealed that a grinding of lime and fillers to the dispersity of at least 250 m2/kg is satisfactory from the point of view of the formation of required densities and strengths for the developed heat-insulating and structural heat-insulating gas concrete products.