Abstract.We investigated the effect of joint grinding of Portland cement clinker, silica and carbonate components and mineral additives to specific surface of 280 -300 m 2 /kg on the properties (strength, average density and thermal conductivity) of non-autoclaved aerated concrete, and the porosity of the hardened cement paste produced from Portland cement clinker with mineral additives. The joint grinding of the Portland cement clinker with silica and carbonate components and mineral additives reduces the energy consumption of non-autoclaved aerated concrete production. The efficiency of mineral additives (diopside, wollastonite) is due to the closeness the composition, the type of chemical bonds, physical and chemical characteristics (specific enthalpy of formation, specific entropy) to anhydrous clinker minerals and their hydration products. Considering the influence of these additions on hydration of clinker minerals and formation of hardened cement paste structure, dispersed wollastonite and diopside should be used as mineral additives. The hardness and, consequently, the elastic modulus of diopside are higher than that of hardened cement paste. As a result, there is a redistribution of stresses in the hardened cement paste interporous partitions and hardening, both the partitions and aerated concrete on the whole. The mineral additives introduction allowed to obtain the non-autoclaved aerated concrete with average density 580 kg/m 3 , compressive strength of 3.3 MPa and thermal conductivity of 0.131 W/(m·°C).
This article describes the technology and automation of non-autoclaved aerated concrete production. The proposed technology differs from traditional technologies by joint grinding of raw materials, which reduces production costs and energy consumption. Automatic control circuitsfor mechanisms executing technological operations are developed. Statistical analysis and verification of a non-linear multiple model confirmed the adequacy of the model: all regression coefficients are significant at the accepted level; all equations are significant; Gauss-Markov conditions are met; model specification is consistent with experimental data. It is possible to choose a composition of mineral additives that would provide the greatest strength of the cement matrix, solving the optimization problem with an equation corresponding to a certain mode of cement hardening. Such technology allows to get competitive high quality wall material, to reduce the cost of production by reducing the number of technological operations, for example, dry grinding of raw mix components, energy consumption and equipment for dry components grinding. The presented technology is recommended for design and use in the production of non-autoclaved aerated concrete wall blocks.
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