INVESTIGATION OF THE EFFECT OF CALCINATION TEMPERATURE AND FINENESS OF KAOLIN FROM BALIKESİR REGION ON POZZOLANIC ACTIVITY

The use of mineral additives in cement production supports an environmentally friendly production process by reducing the amount of clinker and significantly reducing CO2 emissions. Methacholine, obtained as a result of calcination of kaolin at high temperatures, is used effectively as a pozzolan. The study was carried out in two stages to determine the effect of calcination temperature and fineness on the pozzolanic activity index. In the first stage, kaolin was calcined at 3 different temperatures: 600°C, 750°C and 900°C. Mortar samples in accordance with the standard were prepared to determine the pozzolanic activity strength index depending on the calcination temperature. When the 28-day pozzolanic activity strength index results were examined, it was seen that kaolin calcined at 600°C provided the best strength value of 122%. In the second part of the study, the material calcined at 600 °C was ground to three different finenesses as 13800 cm2/g, 15900 cm2/g and 18700 cm2/g, and mortar samples were prepared to determine the pozzolanic activity strength index. As the fineness increased, the pozzolanic activity strength index values also increased.