Studies to Improvement of Cement Pastes for Treatment of Radioactive Liquid Wastes

The partial substitution of blast-furnace slag cement with limestone decreases the water of consistency as well as setting time due to the filling of pores by limestone, which accelerates the setting of cement paste. The substitution of such cement with 5The substitution of blast-furnace slag cement with Homra increases the water of consistency as well as setting time due the pozolanic properties of Homra and decreases the amount of clinker. The substitution of cement with 5 % Homra enhances compressive sAlso by addition of ordinary Portland cement (OPC) to blast-furnace slag cement containing 5 % limestone or 5 % Homra by 35 % or 25 % respectively, improves physico-chemical and mechanical properties of cement pastes. The rate of hydration of blast-furnacThe data obtained from long term and rapid leaching tests show that slag cement containing 5 % limestone, 5 % Homra, 35 % OPC in presence of 5 % limestone or 25 % OPC in presence of 5 % Homra have low values of cumulative fraction, incremental fraction, ldiffusion coefficient for radioactive cesium134, cobalt60 and eurobium152-154. So that addition of limestone, Homra or OPC to slag cement results in a type of filled cement which can be used for treatment of low level radioactive liquid wastes.In addition this filled cement has high resistance for g-radiation up to 50 KGr, and also, this cement can resist sulphate attack when immersed in sea-water.