What is the target air void range for smooth, impermeable asphalt pavement?

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Multiple Choice

What is the target air void range for smooth, impermeable asphalt pavement?

Explanation:
Air void content in an asphalt mixture determines how dense the surface is and how permeable it remains. For a smooth, impermeable dense-graded pavement, you want enough voids to allow proper binder distribution and prevent bleeding, but not so many that water can easily penetrate and accelerate aging. The target range of about 4.0% to 8.0% air voids provides that balance: the mix is dense enough to resist moisture-related damage and provide a smooth surface, yet still has sufficient space to accommodate traffic loading and binder without stiffening too much. If the voids are too low, issues like bleeding and surface rumping can occur; if they’re too high, the pavement becomes more permeable and less durable.

Air void content in an asphalt mixture determines how dense the surface is and how permeable it remains. For a smooth, impermeable dense-graded pavement, you want enough voids to allow proper binder distribution and prevent bleeding, but not so many that water can easily penetrate and accelerate aging. The target range of about 4.0% to 8.0% air voids provides that balance: the mix is dense enough to resist moisture-related damage and provide a smooth surface, yet still has sufficient space to accommodate traffic loading and binder without stiffening too much. If the voids are too low, issues like bleeding and surface rumping can occur; if they’re too high, the pavement becomes more permeable and less durable.

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