No abstract

The paper describes the technology of manufacturing a construction product by vibrocompression using ash and slag waste from thermal power plants in the Pavlodar region. The task of the experimental research was to obtain a hollow wall stone based on ash and slag waste with a strength grade that is not inferior to products made according to the traditional recipe. The obtained samples with different ratios of components in the mixture were investigated for compressive strength, moisture absorption, frost resistance. It has been established that when ash and slag waste are added to the composition of the concrete mixture in an amount of up to 35 % of the mass of dry components, the strength characteristics of the hollow wall stone correspond to the selected brand

The article analyzes the properties changes of non-autoclave foam on a protein foaming agent with the introduction of dispersed wollastonite and diopside. A decrease in the density of foam concrete (to the grade D300, D400), frost resistance of the material, as well as shrinkage deformations was noted. The optimal technological parameters have been determined, allowing to obtain more stable properties and structure of heat-insulating cement-ash non-autoclave foam concrete. The flow chart of the production of foam concrete of natural hardening in the separate preparation of foam and mortar is presented. The studies were performed at NSTU and NGASU (Novosibirsk) and the NII (Norilsk).

The article analyses the influence of SiO2 and Al2O3 nanopowders on properties of ceramics consisting of fly ash from thermal power plants, glass waste, and clay binder. Based on studies of physical and mechanical properties of the obtained ceramics (ultimate compressive strength, ultimate three-point bending strength, wear resistance, and water absorption), the paper shows the positive influence of the nanoadditives. The optimal number of SiO2 and Al2O3 nanopowders in the formulation is 0.5 wt. % that has the strongest effect on ultimate compressive strength and water absorption of the fly ash ceramics samples. The direction of further research on improving the properties of ceramic products is an application of the Al2O3 nanopowder as more perspective nanoadditive using clay dispersant.

"The paper explores the possibility of involving in the processing of waste sludge from alumina production and ash and slag from thermal power plants of Aluminum of Kazakhstan JSC for the production of building products. Alumina production in the Republic of Kazakhstan is concentrated in Aluminum of Kazakhstan JSC and is characterized by a large amount of waste sludge and ash and slag generated by Pavlodar TPP-1, which is part of the structure of the enterprise. In the work, studies were carried out to obtain concrete mixtures consisting of alumina production sludge within 25–45 %, ash and slag from thermal power plants within 31–45 %, lime within 5–15 %, water 10–23 %. Waste sludge in the composition of concrete served as a component of a mixed binder and hydraulically active filler, ash and slag – the role of mineral aluminosilicate additives in the composition of a mixed binder, lime – the role of hardening activators of a mixed binder. In the course of the conducted experimental studies, it was found that mixture No. 1, including 25 % of alumina production dump sludge, 38 % of ash and slag TPP, 15 % quicklime and 22 % water."