Investigations of blended low energy cements

Three kinds of Low Energy Cement (LEC) were prepared at lower temperatures than those necessary for the production of Ordinary Portland Cement - a hig h content Belite Cement (HBC) produced in a cement plant at 1260 degrees C and two kinds of Sulfoaluminate Belite Cement (SAB1 and SAB2) synthesised i n laboratory at 1250 degrees C. HBC sets slowly (set point over 200 min), S AB1 and SAB2 are fast-setting cements (set point within 30 minutes). HBC bl ended with either SAB1 or SAB2 (70/30 on the weight basis) gives setting ti mes inside of 60-80 minutes. The replacement of HBC by 30 wt.% of SAB2 impr oved mechanical strength, pore structure, absorption capacity and dynamic m odulus of elasticity of the cured cement, while the combination with SAB1 s howed decreased values of these parameters. The conduction calorimeter show ed an expressive difference in the heat evolution curves of blended cements .