Which of the following is a cause of raveling?

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Multiple Choice

Which of the following is a cause of raveling?

Raveling happens when surface aggregates loosen and pull out under traffic because the surface isn’t bonded and dense enough. The most direct cause is insufficient compaction after placement. If the mat isn’t compacted to the proper density, voids remain, the aggregate interlock isn’t fully developed, and the asphalt film may not coat and grip the particles well. Traffic shears these weak spots, removing fines and surface material and leaving the surface rough and progressively worn. Weather conditions by themselves don’t create raveling; they influence workability and compaction. Clean aggregates help with bonding, and excess asphalt content tends to cause issues like bleeding rather than raveling, so they don’t fit the primary mechanism as well as inadequate compaction.

Raveling happens when surface aggregates loosen and pull out under traffic because the surface isn’t bonded and dense enough. The most direct cause is insufficient compaction after placement. If the mat isn’t compacted to the proper density, voids remain, the aggregate interlock isn’t fully developed, and the asphalt film may not coat and grip the particles well. Traffic shears these weak spots, removing fines and surface material and leaving the surface rough and progressively worn.

Weather conditions by themselves don’t create raveling; they influence workability and compaction. Clean aggregates help with bonding, and excess asphalt content tends to cause issues like bleeding rather than raveling, so they don’t fit the primary mechanism as well as inadequate compaction.

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