Abstract
This paper mainly discusses the volume characteristic change trend of SMA-10 as ultra thin friction course under different gradation design conditions. Marshall compaction results shows that air void is relevant to 2.36mm-4.75mm gravel content. Skeleton structure analysis indicates that 2.36-4.75mm gravel content below 15% is suitable. We can choose designing gradation with 2.36mm or 4.75mm as control point. 1.18mm aggregate interference effects apparently for 2.36mm sieve pore as break point (BP). Road performance of SMA-10 meets the demands when gradation is designed according to the research conclusions.
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