Abstract
Expansive agents are used to decrease concrete shrinkage. Two types of expansive materials are presently used: one is based on calcium sulphoaluminate, whereas the other is dead-burn lime. Some commercial formulations are a combination of these two expansive materials. As the dosage of these expansive agents is usually quite small, they are diluted in a certain quantity of Portland cement in order to mitigate the effect of an error of dosage. When using an expansive agent, it is very important to properly water cure concrete in order to be sure to provide the necessary water for the expansive agent to obtain the desired expansion. The expansion obtained depends essentially not only on the dosage of the expansive agent but also on the temperature and the efficiency of the water curing. The use of expansive agents is very simple and very efficient, provided that good water curing is applied on concrete and the temperature is not too cold.
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