Effects of calcination temperature of kaolinite clays on the properties of geopolymer cements

► Kaolinite clays are calcined between 450-800°C in view of producing geopolymer cements. ► The setting time of cements reduces with increasing temperature up to 700°C. ► The linear shrinkage of samples aged from 21 to 28 days decreases and the lowest value is around 700°C. ► The compressive strength of cements increases when calcination is carried out up to 700°C. ► The most convenient temperature for the calcination of kaolinite clays is around 700°C.