SC Swimming Pool Practice Questions - South Carolina Swimming Pool Contractor Examination Exam

Entrained air is specified in concrete exposed to freezing and thawing primarily to do which of the following?

Increase the water-cement ratio Provide microscopic voids that relieve ice-expansion pressure Darken the concrete for faster solar heating Replace the need for reinforcing steel

Correct Answer:

Provide microscopic voids that relieve ice-expansion pressure

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