SC Water And Sewer Plants Practice Questions - South Carolina Water And Sewer Plants Contractor Examination Exam

Why is air-entrained concrete specified for exterior plant structures in South Carolina freeze-thaw exposure?

Entrained air replaces the need for any cement in the mix Microscopic air voids relieve pressure from freezing water and improve freeze-thaw durability Air-entrainment is used only to increase 28-day compressive strength Entrained air makes the concrete waterproof so curing can be skipped

Correct Answer:

Microscopic air voids relieve pressure from freezing water and improve freeze-thaw durability

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