大粒径大空隙沥青混合料成型方法试验研究
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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.
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.
引文
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[2]童申家,雷琳,惠阵江.几种不同级配大粒径沥青混合料大马歇尔试件研究[J].公路工程,2011,36(6):86-89.
[3]付其林,陈拴发,陈华鑫.开级配大粒径沥青碎石混合料的高温稳定性[J].长安大学学报(自然科学版),2010,30(2):20-23.
[4]Nicholls J C.Review of UK porous asphalt trials[M].UK:Transportation Research Laboratory,1997.
[5]Kandhal P S.Large stone asphalt mixes[J].Design and Construction,1990.
[6]NCHRP Report 386.Design and evaluation of large stone asphalt mixes[J].Transportation Research Board National Research Council,1990.
[7]Kandhal P S.Design of large stone asphalt mixes for low-volume roads using six-inch diameter marshall specimens[J].Asphalt Mixtures,1991.
[8]安建国.大粒径沥青混合料配合比设计及施工工艺监控[J].筑路机械与施工机械化,2013,30(12):70-74.
[9]王松根.大粒径大空隙沥青混合料(LSPM)柔性基层设计与施工指南[M].北京:人民交通出版社,2007.
[10]李正道.大粒径透水性沥青混合料组成设计及适用性研究[D].郑州:郑州大学,2015.
[11]魏建国,付其林,徐敬道.沥青结合料对沥青碎石路面性能的影响[J].公路交通科技,2014,31(11):1-9.
[12]王富玉,刘元烈,任立锋.大粒径沥青混合料的路用性能研究[J].公路,2003,2(2):117-120.
[13]刘中林,王富玉,郝培文,等.大粒径沥青混合料组成结构的研究[J].土木工程学报,2004,37(7):59-63.
[14]付其林,刘朝晖,马年祖,等.开级配大粒径沥青碎石成型方法[J].长安大学学报(自然科学版),2016,36(4):33-40.
[15]沙爱民,王玲娟,耿超.大粒径碎石沥青混合料振动压实方法[J].长安大学学报(自然科学版),2008,28(2):1-4.
[16]JTG F40-2004,公路沥青路面施工技术规范[S].
[17]鲁正兰,孙立军,孙希瑾.成型温度对沥青混合料体积参数的影响分析[J].同济大学学报(自然科学版),2006,34(2):186-190.
[18]李秋忠,王兵,辛星.大碎石柔性基层性能研究[J].公路,2007,5(5):140-143.
[19]陈勇军.MAC改性沥青机理及其性能研究[J].公路工程,2011,36(2):187-191.
[20]王恩东,张洪亮,王选仓.MAC改性沥青改性剂的研发[J].公路,2008,12(12):203-208.
[21]王恩东,张洪亮,王选仓.MAC改性沥青大粒径大空隙沥青混合料试验研究[J].交通运输工程学报(英文版),2008,8(6):6-12.
[22]江晓霞,沙爱民.超大粒径沥青混合料的成型方法[J].长安大学学报(自然科学版),2012,32(4):11-15.