Why specify lift sequencing or cooling pipes for massive mat pours?
Choices
- (A) Core heat expands while surfaces cool inducing tensile shocks that crack deep mats
- (B) Hydration heat is negligible regardless of cement content
- (C) Thermal gradients never threaten unreinforced blinding layers
- (D) Ambient shade alone regulates core temperatures uniformly
Correct answer: (A)
Core heat expands while surfaces cool inducing tensile shocks that crack deep mats
Explanation
Heat-of-hydration differentials crack thick pours unless lifts or cooling tubes temper cores.