PROSPECTS FOR THE USE OF ASH FROM TPPS FOR THE MANUFACTURE OF BUILDING MATERIALS
Keywords:TPP ash, waste, recycling, quality characteristics of ash, aerated concrete mixtures
The article analyzes the problems of environmental pollution and promising directions for the disposal of waste from the production of coal-fired thermal power plants. Possible ways of managing solid waste from coal-fired power plants have been identified in order to preserve our environment. Potential possibilities of using ash in agriculture, in the design of the roadway, in the production of bricks, as an integral component in Portland cement are considered. The presence of valuable components in the ash creates undoubted prerequisites for its recycling. The authors carried out a study of the chemical composition, physical, mechanical and quality indicators of ash - waste products of the Burshtyn TPP to study the possibility of using it as a raw material in the production of building materials. It has been determined that according to the chemical composition of the fly ash of the Burshtyn thermal power plant (BuTPP), more than 70% consists of silicium and aluminum oxides. The assessment of the quality characteristics of ash was carried out by calculation with the determination of the basicity modulus, silicate modulus and quality factor. It was determined that BuTPP ash belongs to acidic, latently active. It is proposed to use ash as active mineral additives in raw mixes to obtain ash concrete. For this purpose, a study of the rheological characteristics of a mortar mixture of ash-cement porous concrete compositions was carried out, the influence of the composition of ash on the processes of hydration of cement components was investigated, and the quantitative characteristics of this effect were established. The strength of aerated concrete massif was determined depending on the type of raw mixture. The results obtained made it possible to develop technologies for replacing cement with ash in the composition of aerated concrete, to optimize its raw material composition; to determine the kinetic characteristics of hardening processes by introducing chemical additives NaCl and Na2SO4 to accelerate hydration processes.
Koshlak H.V. Zmenshennia tekhnohennoho vplyvu vuhilnykh TES na dovkillia (na prykladi Burshtynskoi TES) / H.V. Koshlak, A.M. Pavlenko // Ekolohichna bezpeka ta zbalansovane resursokorystuvannia. −2017. − №2. – S. 108-118.
Nihalani S.A., Mishra Y.D., Meeruty A.R. (2020) Handling and Utilisation of Fly Ash from Thermal Power Plants. In: Ghosh S., Kumar V. (eds) Circular Economy and Fly Ash Management. Springer, Singapore. https://doi.org/10.1007/978-981-15-0014-5_1
Gorai S. Utilization of Fly ash for sustainable environment management / S Gorai. // Journal of materials and environmental sciences. −2018. − №9. – pp. 385-393.
López-Cuevas J., Interial-Orejón E., Gutiérrez-Chavarría C. A. Synthesis and characterization of cordierite, mullite and cordierite-mullite ceramic materials using coal fly ash as raw material // Materials research society. 2018. V. 2. No. 62. P. 3865 – 3872.
Hassan K E, Chaddock B, Chandler J W E, Roberts C, Coley C, Badr A and Reid J M, August 2007, TRL Unpublished Project Report UPR/IE/119/07, Specification Trials and Testing of HBMs, for Waste & Resources Action Programme (WRAP), Aggregate Research Programme.
Sobolev K., Vivian I. F., Saha R. The effect of fly ash on the rheological properties of bituminous materials // Fuel. 2014. V. 116. P. 471 – 477.
Basu M. Review Potential ﬂy-ash utilization in agriculture: A global review / M. Basu, M. Pandea, P.B.S. Bhadoriab, S.C. Mahapatra // Progress in Natural Science. −2009 −№19. – pp. 1173–1186.
S.K. Sharma, N. Kalra Effect of flyash incorporation on soil properties and productivity of crops: a review J Sci Ind Res, 65 (5) (2006), pp. 383-390.
Thetwar L. K. Studies on the effects of fly ash and plant hormones on soil metabolic activities / L. K. Thetwar, N. C. Desmukh, A. K. Jangde // Asian J Chem. – 2007. – №19(5). – pp.3515–3518.
Jusi A.F. Environmental impact of ball clay mining in Del Gallego / A.F. Jusi // Camarines Sur: University of Nueva Caceres, Naga City. – 2002. –pp. 39-63.
Ashish Kumar D. Strength and durability characteristics of bricks made using coal bottom and coal fly ash / Ashish Kumar D. Verma1a K, Singh1 J., Sharma N. // Advances in Concrete Construction. – 2018. –Vol. 6–No. 4. pp. 407-422.