What is the minimum ambient temperature for placing 2.1-3.0 inch lifts?

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Multiple Choice

What is the minimum ambient temperature for placing 2.1-3.0 inch lifts?

Explanation:
When placing a 2.1–3.0 inch asphalt lift, you want the air to be warm enough to keep the mix workable as it’s laid and compacted. A higher ambient temperature helps the hot mix stay above its stiffness threshold long enough for proper compaction, ensuring the asphalt binder coats the aggregates well and the mat consolidates to the required density. For this lift thickness, the minimum practical ambient temperature is 50°F. If the air is cooler than that, the mix cools too quickly, making compaction difficult, increasing air voids, and risking cold joints or premature cracking. The lower temperatures listed would not provide sufficient workability for this thickness.

When placing a 2.1–3.0 inch asphalt lift, you want the air to be warm enough to keep the mix workable as it’s laid and compacted. A higher ambient temperature helps the hot mix stay above its stiffness threshold long enough for proper compaction, ensuring the asphalt binder coats the aggregates well and the mat consolidates to the required density. For this lift thickness, the minimum practical ambient temperature is 50°F. If the air is cooler than that, the mix cools too quickly, making compaction difficult, increasing air voids, and risking cold joints or premature cracking. The lower temperatures listed would not provide sufficient workability for this thickness.

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