Low-calorie cement
It is characterized by a slow and low quantitative release of the heat of hydration. It is accompanied by a slow process of setting and hardening. Concrete made of this cement shows a very low tendency to swell during maturation and shrinkage during operation. It is obtained mainly by lowering C3A and C3S in the mineralogical composition. It gives off no more than 250 kJ / kg within 7 days and no more than 300 kJ po 28 days. In such cement, the amount of CO in relation to the oxides of other elements is much lower than in ordinary cements. Low-calorie cement is divided into Portland and metallurgical varieties. There are known cases of particular modification to accelerate the maturation without increasing the amount of heat. The cement obtained in this way is used primarily for concreting large massifs.
The equivalent of this cement, but differently, belite and hydrotechnical cement are produced.