Discussion
A low-heat cement is required for a mass concrete dam because a large heat of hydration would cause
Answer: B
Correct answer: thermal cracking as the interior cools
In a large pour the heat of hydration cannot escape, so the interior rises many tens of degrees above the surface and expands. As it later cools it contracts against a surface that has already set, and the resulting tensile stress cracks the mass. A low-heat cement, higher in dicalcium silicate and often blended with pozzolana, releases the same heat far more slowly.
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