Non-autoclaved aerated concrete with mineral additives

Abstract

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).

High-Strength and Heat-Insulating Cellular Building Concrete Based on Calcined Gypsum

“…ECOCON concrete is a type of lightweight aerated cellular concrete industrially manufactured as a dry powder mixture, which can be turned into a lightweight concrete by mixing it with water [9]. It is made using a unique manufacturing process with the application of nanotechnology, which allows the pre-design of the consistency of the concrete, with its final quality being independent of the production method (in-plant or in situ).…”