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Implementation Spotlight: Paving Thick Lifts for Deep Rapid Rebuilds

Research has shown that the minimum thickness of a plant-mix asphalt paving lift should be three times the nominal maximum aggregate size (NMAS) of the aggregate blend for fine-graded mixtures and four times the NMAS for coarsegraded mixtures. Lift thicknesses thinner than this are difficult to compact due to aggregate packing. However, there is little guidance on a maximum lift thickness.

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