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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
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Abstract:Hardening cement releases heat, and because concrete is a thermal insulator, heat near the surface dissipates into its surroundings more quickly than heat deeper in the mass. Because concrete contracts as it cools, tension can build between surface and interior regions of the mass. The larger the mass, the greater this tension can be, sometimes causing cracking and spalling in the concrete surface. Cracking can reduce the design strength of concrete and weaken concrete structures by creating access for moisture or salt water to attack steel reinforcement.
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