Practice question

How does a prime coat differ from a tack coat?

Prime is sprayed on untreated aggregate base to penetrate and bind fines; tack is a bond coat on an existing paved surface
Prime and tack are identical products used on the same surface
Tack is used only on soil subgrade; prime is used only on bridge decks
Prime replaces the asphalt surface mix

Answer: A — Prime is sprayed on untreated aggregate base to penetrate and bind fines; tack is a bond coat on an existing paved surface

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