大粒径大空隙沥青混合料成型方法试验研究  

Experimental Research on Molding Method of Large-grain Large-porous Asphalt Mixtures

作　　者：高翔 Gao Xiang

机构地区：[1]武汉市政工程设计研究院有限责任公司

出　　处：《城市道桥与防洪》2019年第5期261-263,275,M0028,共5页Urban Roads Bridges & Flood Control

摘　　要：成型温度与击实次数对大粒径大空隙沥青混合料的路用性能影响显著。为了确定MAC改性沥青大粒径大空隙沥青混合料的室内成型方法,首先采用软化点试验,分析了加热温度对MAC改性沥青软化点测试结果的影响,推荐了MAC改性沥青的加热温度;其次采用大型马歇尔击实试验,分析了击实次数对大粒径大空隙沥青混合料体积指标的影响。试验结果表明:随着加热温度的增加,MAC改性沥青软化点增势先急后缓,以195℃为变化节点;随着击实次数的增加,大粒径大空隙沥青混合料毛体积相对密度先增大后减小,而空隙率则相应地先降低后增高,均在112次击实次数时达到极值;推荐195℃沥青加热温度、112次击实次数作为MAC改性沥青大粒径大空隙沥青混合料的室内成型方法。The road performances of large-grain large-porous asphalt mixtures are significantly affected by molding temperature and compaction numbers. In order to determine the indoor molding method of MAC modified asphalt large-grain larger-porous asphalt mixtures, the softening point test is firstly used to analyze the effect of heating temperature on the softening point test result of MAC modified asphalt and to recommend the heating temperature of MAC modified asphalt. Then the large Marshall Compaction Test is used to analyze the effect of compaction numbers on the volume indicators of large-grain large-porous asphalt mixtures. The test results show that softening point growth trend of MAC modified asphalt is first rapid and then slow at the temperature node of 195℃ with the increment of heating temperature. With the increment of compaction number, the bulk-volume relative density of large-grain large-porous asphalt mixture is firstly increased and then decreased, and accordingly the void ratio is firstly decreased and then increased. All reach the extreme values at 112 compaction numbers. The asphalt heating temperature of 195℃ and the compaction numbers of 112 times are recommended as the indoor molding method of large-grain large-porous asphalt mixtures.

关 键 词：大粒径 大空隙 沥青混合料 成型方法 成型温度 击实次数 

分 类 号：U414[交通运输工程—道路与铁道工程]