Abstract
Abstract The heat of hydration of normal portland cement causes an increase in concrete temperature that may result in undesired cracks on cooling after hardening. For this reason, alternatives to lowering it are sought. This paper discusses the benefits of adding mineral admixtures, such as natural pozzolan, fly ash, and granulated blast furnace slag to control heat of hydration development. For this study, blended cements were prepared using an ordinary portland cement clinker, gypsum, and mineral admixtures, previously ground in a laboratory mill. The average fineness employed was 450 m2/kg. The percentages of mineral admixtures were: 0, 10, 20, 30, 50, 70, and 90, by mass. Tests were performed at 3, 7, 28, 90, and 180 days. Results are expressed in percentages of control cement (0% replacement) and are plotted for each replacement, percentage, and age. Empirical coefficients of the contribution of mineral admixtures to the heat of hydration have been obtained, as well as a mathematical expression to estimate the heat of hydration of a blended cement, on the basis of the mineral admixture selected, the percentage used, and the heat of hydration of the control cement, up to 180 days.
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