Two clays from deposits located in the region of Central Bosnia, and kaolin obtained from a local
spark plug and technical ceramics factory were calcined at 800, 900, and 1000 ºC. The pozzolanic
activity of calcined raw materials was determined using the P test. Calcined clay from the deposit
Bilalovac showed slightly better reactivity compared to calcined clay from the deposit Klokoti, and
in both clays, the reactivity increased with increasing calcination temperature. Calcined kaolin was
more reactive than clays and the highest reactivity was achieved when calcined at 800 °C. The
strengths of mortars in which 20 % of cement was replaced with calcined raw materials showed the
same trend of behavior as in the P test. Partial replacement of cement with calcined clays lead to a
slight decrease in the strength of cement mortar, and the best results were obtained with clays
calcined at 1000 °C.
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