For lifts of 1.0 inches or less, what is the minimum ambient temperature required?

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Multiple Choice

For lifts of 1.0 inches or less, what is the minimum ambient temperature required?

Temperature affects how pliable and workable the hot-mix asphalt stays as it is laid and compacted. For lifts that are 1 inch or less, the mat cools quickly, so a warmer ambient environment helps keep the mix workable long enough for the roller to densify it properly and achieve a good bond with the underlying layer. If the air is cooler than 55F, the mix stiffens too quickly, making it hard to achieve the required density and surface smoothness. That’s why 55F is the minimum ambient temperature specified for these thin lifts. The lower values would risk poor compaction, while a higher value would be more than necessary to meet the same requirement.

Temperature affects how pliable and workable the hot-mix asphalt stays as it is laid and compacted. For lifts that are 1 inch or less, the mat cools quickly, so a warmer ambient environment helps keep the mix workable long enough for the roller to densify it properly and achieve a good bond with the underlying layer. If the air is cooler than 55F, the mix stiffens too quickly, making it hard to achieve the required density and surface smoothness. That’s why 55F is the minimum ambient temperature specified for these thin lifts. The lower values would risk poor compaction, while a higher value would be more than necessary to meet the same requirement.

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