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To reduce the environmental impact of cement industries, cementitious materials are added to the manufacture of eco-efficient cements, focusing in industrial wastes.In this paper metakaolinite (MK) based industrial wastes have been mixed with cement in order to study the effect of the chemical composition of the raw material in both microstructural and mechanical properties of the pastes.Frattini test was also determined.The selected kaolin based industrial wastes were previously activated for two hours at temperatures around 600℃ to transform the inert waste into a cementing material.The industrial wastes materials used were coal mining and paper sludge.The second one was mixed with fly ash (50/50 w/w) in order to evaluate the performance of ternary blended cements.The mixtures were prepared with OPC and both 6 and 20% of activated industrial waste (coal mining and paper sludge + fly ash).