AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

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What is the main reason air entrainment is specified for concrete at an exposed tunnel portal, headwall, or shaft collar?

To raise the water-cement ratio so the mixture pumps farther To resist damage from cycles of freezing and thawing To eliminate the need for curing To increase compressive strength above the specified value

Correct Answer:

To resist damage from cycles of freezing and thawing

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