Recycling coal fly ash and coal bottom ash from Moroccan thermal power plant in concrete manufacturing

The aim of this investigation is to assess the use of fly ash and bottom ash generated from taqa morocco thermal power plant as replacement of cement and coarse aggregate, respectively in concrete manufacturing. firstly, characterization of these wastes from thermal power plant was conducted in order to determine their chemical and physical compositions. further experiments were carried out by replacing cement with fly ash which was varying in percentages (0%,10%, 20%, 30% and 40%). in the same sense, various volume fractions of natural coarse aggregate (0%, 20%, 40%, 60%, 80%, and 100%) were replaced by the same volume of coal bottom ash. the results showed that the slump flow of fresh concrete was slightly decreased when fly ash was replaced 10%, 20% and 30% of cement. the same evolution obtained for mixture containing bottom ash as a replacement of normal aggregate. moreover, it also showed that compressive strength of concrete ‘a’ did not changed significantly when cement was replaced with 10%, 20% and 30% of fly ash. but incorporating fly ash up 30% has a negative impact on compressive strength . however, in case of concrete ‘b’, the compressive strength of concrete ‘b’ did not affected until 80% of bottom ash but it decreased when bottom ash was used as total replacement of coarse aggregate. overall, fly ash and bottom ash can be effectively used in concrete manufacturing.