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Impact of some nanoadditives, such as amorphous SiO₂ (AS) of pozzolanic properties and carbon fibers (CF) reduced to nanosize particles on autoclaved aerated concrete (AAC) forming mixtures, the following parameters were investigated: changes in consistence of binding material during hydration, spreadability, expansion and temperature of mixture, plasticity strength. The investigations were carried out with AAC forming mixture where 10 % lime was replaced by equivalent content of Portland cement. Upon completion of investigations, it was established that the optimal replacement of sand by AS was 1.0 % resulting in increase of temperature of AAC forming mixture by up to 2.1 %, expansion by up to 11.0 %, ultrasonic impulse velocity (UIV) by up to 3.0 % and plasticity strength by up to 271.4 %. Meanwhile the optimal replacement of sand by CF was 0.1 % resulting in decrease in temperature of AAC forming mixture by up to 1.5 %, expansion by up to 16.0 % and increase in  UIV by up to 2.0% and plasticity strength by up to 152.9 %.

DOI: http://dx.doi.org/10.5755/j01.ms.18.3.2441

Journal of Environmental Engineering and Landscape ManagementPublication details, including instructions for authors and subscription information:Abstract. Due to hardening in autoclaves and mechanical processing of autoclaved aerated concrete (AAC) massive, the process of production of AAC unavoidably generates waste. Up to now, there were no ways for utilisation of this type of waste. The article deals with the adsorption effectiveness of crushed autoclaved aerated concrete waste (CAACW). It was established that the ability of CAACW to adsorb certain liquids (water, diesel fuel, used engine oil) depends on viscosity of liquid which, in its turn, influences the depth of adsorption. Subject to this index, the CAACW was divided into two fractions: powder (size up to 2.50 mm) and crumbs (size from 2.50 to 10.0 mm). It was found that oil products of different kinematic viscosity are fully adsorbed by CAACW powder, i.e. diesel fuel 0.52 g/g in 18 min, and used engine oil 0.39 g/g in 1 h 15 min. The CAACW crumbs, processed by 2.00% FeSO 4 solution and dried to 3.50% of residual moisture are suitable as litter for cats. The practical use of CAACW will help us solve two important environmental problems: on the one hand -to recover the industrial waste, on the other -to prevent ground pollution by effused oil products.