What is the maximum compacted thickness for HMA Surface Course?

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Multiple Choice

What is the maximum compacted thickness for HMA Surface Course?

Explanation:
In asphalt paving, the amount you compact in a single pass matters for achieving the required density and surface quality. For the HMA surface course, the per-lift thickness is limited to two inches. This keeps the mix within the range that rollers can compact effectively, ensuring the target density, proper air voids, and a smooth surface. Lifts thicker than two inches are difficult to compact fully in one pass, which can lead to density issues, roughness, and potential long-term pavement problems. If more total thickness is needed, you place additional lifts, each no more than two inches, with proper bonding between layers.

In asphalt paving, the amount you compact in a single pass matters for achieving the required density and surface quality. For the HMA surface course, the per-lift thickness is limited to two inches. This keeps the mix within the range that rollers can compact effectively, ensuring the target density, proper air voids, and a smooth surface. Lifts thicker than two inches are difficult to compact fully in one pass, which can lead to density issues, roughness, and potential long-term pavement problems. If more total thickness is needed, you place additional lifts, each no more than two inches, with proper bonding between layers.

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