Britannica Sources used in this answer

Why is low-heat portland cement useful in large concrete structures?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Cement The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.

Low-heat portland cement is specifically formulated to generate a minimal amount of heat during the chemical process of hydration, which occurs as the material sets and hardens.12

In large concrete structures, such as dams, this property is essential for preventing structural failure. Because concrete releases significant heat as it hardens, the massive volumes required for large projects can lead to excessive internal temperatures. As the concrete eventually cools, it shrinks; if the temperature gradient is too high, this shrinkage causes serious cracking, which compromises the integrity of the structure. By using low-heat cement, engineers can effectively reduce the total heat generated during the curing process, thereby mitigating the risk of thermal cracking.2