不同类型粗集料对Sup-16沥青混合料配合比及耐久性的影响OA

To investigate the effects of different coarse aggregate types on the mix design,road performance,and durabil-ity of Sup-16 asphalt mixtures,systematic experimental tests were conducted on three Sup-16 mixtures using different coarse aggregates,while maintaining a consistent gradation and the same optimum asphalt content.The results show that the high-temperature performance,moisture stability,and structural stability of the mixtures vary considerably with coarse aggregate type.The dynamic stability of the mixture with Type-C coarse aggregate ranges from 5 860～6 080 cycles/mm,which is generally higher than that of the other two groups.Under freeze-thaw conditions,the freeze-thaw splitting strength ratios of the three mixtures de-creased by 6.5～6.8 percentage points,respectively,with the Type-C mixture consistently maintaining a high-er level.After aging,the Type-C mixture exhibited a splitting strength retention rate of 89.0%and a volume expansion rate of 0.48%after 28 days of moisture-heat exposure,indicating favorable long-term service per-formance.