Abstract
Results from studies on the physical and mechanical properties of lightweight and expansive cements cured at 20 and 75°C are presented. Lightweight additive (cenospheres from thermoelectric power station “Bobov Dol,” Bulgaria) and expansive additive (“Bulexa” with hydroxide type of expansion) were used. The compressive and flexural strength, the gas and water impermeability, and the pore structure of the cement stone of lightweight and expansive cements were investigated. The results are compared with corresponding parameters of cement stone without additives. It was found that the cenospheres are appropriate lightweight additives. The use of expansive additive helps overcome the dry shrinkage of cement stone and strengthens the bond with the bounding surfaces.
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