Properties of concrete with the calcined low-kaolinite clay as a partial cement replacement
Properties of concrete containing the ground calcined low-kaolinite clay was experimentally studied. Clay, calcined at 900 and 1000°C, was used as a partial replacement of cement at dosage of 20 % by the weight of cement. Tests performed on concrete samples include the consistency, air content, compressive strength and flexural strength. The experimental results show a moderate decrease in slump, as well as in compressive and flexural strength comparing to concrete containing only cement CEM I as a binder. Better results were obtained with concrete containing clay calcined at 1000°C. Further research is needed to determine the optimal dosage of calcined clay in concrete, as well as the optimal temperature of clay calcination.