Which cement type has only 40-60% of the heat produced by Type I cement during the first 7 days of hydration?

Type IV cement is designed specifically to produce lower heat of hydration compared to other types of cement, particularly Type I. This cement type typically generates only 40-60% of the heat produced by Type I cement during the crucial first 7 days of hydration, which is particularly beneficial for large concrete pours or mass concrete structures where excessive heat can lead to cracking and other structural issues.

By significantly reducing the heat of hydration, Type IV cement helps to minimize thermal stresses within the setting concrete, making it a vital choice for projects in hot climates or where large volumes of concrete are used. This characteristic makes it especially valuable for applications such as dams, large slabs, or any structure where controlled heat generation is essential to maintaining integrity and performance over time.