What is the maximum particle size permitted in the top 12 inches of an embankment?

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Multiple Choice

What is the maximum particle size permitted in the top 12 inches of an embankment?

Explanation:
Limiting the largest particle size in the uppermost twelve inches of an embankment helps ensure the fill can be compacted evenly and produces a smooth, stable surface for the pavement above. The top layer needs to densify reliably with standard compaction equipment, and oversized particles can create bridges and voids that resist compaction, leading to uneven density and surface irregularities later on. Therefore, the practical maximum is 3.5 inches. If larger material were allowed, compaction would be unreliable and the subgrade could develop differential settlement or surface bumps. The other sizes either permit too-large material, risking instability, or are unnecessarily restrictive for typical fills.

Limiting the largest particle size in the uppermost twelve inches of an embankment helps ensure the fill can be compacted evenly and produces a smooth, stable surface for the pavement above. The top layer needs to densify reliably with standard compaction equipment, and oversized particles can create bridges and voids that resist compaction, leading to uneven density and surface irregularities later on. Therefore, the practical maximum is 3.5 inches. If larger material were allowed, compaction would be unreliable and the subgrade could develop differential settlement or surface bumps. The other sizes either permit too-large material, risking instability, or are unnecessarily restrictive for typical fills.

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