![]() However, in order to achieve satisfactory durability of fly ash concretes the amount of cement replacement should be 40% or less. According to Naik it is well established in North America that the use of C1ass C (calcerous) fly ash according to ASTC C618 is feasible in superplasticized structural as well as high-strength concretes with high cement replacements in excess of 50%. Thus a significant amount of calcerous fly ash is generated and its use in concrete would result in a number of environmental benefits. USA, Canada, Germany, Greece it is also used to produce about 35% of electricity in Poland. Brown coal is used to produce heat and electricity in numerous countries, e.g. Glinicki, in Brittle Matrix ComposiINTRODUCTIONĬoal ash is a by-product of power generation in coal burning plants.
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