In a mass concrete pour, concrete is placed in horizontal layers of approximately how thick?

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Multiple Choice

In a mass concrete pour, concrete is placed in horizontal layers of approximately how thick?

Explanation:
In mass concrete pours, the size of each horizontal lift is kept small to manage the heat that the concrete generates as it hydrates. Limiting the thickness helps heat dissipate from the interior toward the surface, which reduces temperature differentials that can cause thermal cracking as the slab cures. Six inches is a practical thickness—it’s thick enough to place and consolidate efficiently, yet thin enough to cool reasonably and minimize cracking risk. Thicker lifts would trap more heat and raise the chance of cracks, while much thinner lifts would slow progress and require more joints.

In mass concrete pours, the size of each horizontal lift is kept small to manage the heat that the concrete generates as it hydrates. Limiting the thickness helps heat dissipate from the interior toward the surface, which reduces temperature differentials that can cause thermal cracking as the slab cures. Six inches is a practical thickness—it’s thick enough to place and consolidate efficiently, yet thin enough to cool reasonably and minimize cracking risk. Thicker lifts would trap more heat and raise the chance of cracks, while much thinner lifts would slow progress and require more joints.

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