The use of thermal power plant ash to produce high-strength concrete and reduce cement consumption

Abstract

The results of experimental studies on the use of fly ash of thermal power plants for the production of high-strength concrete or the replacement of part of the cement in the concrete mixture with TPP ash are presented. The results of experimental studies show the high efficiency of the multifunctional complex APP (fly ash⁺) developed on the basis of fly ash of thermal power plants in the production of high-grade concretes and the possibility of replacing a significant part of cement in the concrete mixture. To obtain high-strength concretes, the amount of APB (fly ash⁺) additionally introduced into the concrete mixture is from 5 % to 100 % of the cement mass. At the same time, an increase in the strength of concrete by 2–2.3 times in comparison with the strength of the concrete of the base composition can be achieved. The replacement of a part of cement in the concrete mixture with a multifunctional complex of APB (fly ash⁺) in an amount from 5 % to 80 % makes it possible to preserve the strength of concrete at the strength level of the concrete base composition. The possibility of utilization of practically unlimited volumes of coal burning waste and reduction of cement consumption in concrete mixtures is shown. At the same time, the anthropogenic impact on the biosphere and the size of the carbon footprint are reduced, both in the production of thermal and electrical energy, and in the production of cement.