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The stockpiling of tailings around coal mines poses a major environmental problem.\udNonetheless, this clay mineral (kaolinite)-based waste can be reused as a supplementary cementitious\udmaterial (recycled metakaolinite) in the manufacture of future eco-efficient cements. This paper\udexplores the most significant scientific questions posed in connection with the conversion of this\udwaste into pozzolans, such as the variation in product mineralogy depending on the sintering\udtemperature and its effect on reaction kinetics in the pozzolan/Ca(OH)2 system over a period\udof 365 days. The findings show that the optimal sintering temperature is 600 ˝C, such that the\udcementitious properties of the activated product are determined solely by the conversion of kaolinite\udinto metakaolinite and are unaffected by the other clay minerals (micas). The presence of 20%\udactivated coal waste favors the formation of larger amounts of aluminous phases such as C4AH13\udand C4AcH12 than in the reference paste and enhances C–S–H gel polymerization.Peer reviewe

Coal Mining Waste as a Future Eco-Efficient Supplementary Cementing Material: Scientific Aspects