SC Bridges Practice Questions - South Carolina Bridges Contractor Examination Exam

What is the primary purpose of a tack coat placed on an existing asphalt or concrete surface before a new HMA lift?

To waterproof an untreated aggregate subgrade To bond the new lift to the existing surface so the layers act together To replace rolling and density control on the new mat To cool the existing pavement before the paver arrives

Correct Answer:

To bond the new lift to the existing surface so the layers act together

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