LSAM路用性能研究
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摘要
为优化大粒径沥青混合料LSAM的路用性能,文章进行了改进大型马歇尔试验、高温抗车辙试验、劈裂试验及水稳定性试验,并通过改变矿料级配、集料公称最大粒径及试验温度等因素,对LSAM各项性能进行研究。结果显示:公称最大粒径的变化对LSAM的高温性能影响显著,对其他路用性能指标影响较低;公称最大粒径的增加提高了LSAM的动稳定度指标;采用间断级配LSAM有助于提高动稳定度指标,但对于冻融劈裂强度比指标、劈裂强度指标,采用密级配结构更有利,且随环境温度的增加,不同级配的LSAM抗压回弹模量均显著下降。
In order to optimize the road performance of large-size asphalt mixture LSAM,this article conducts the improved large Marshall test,high-temperature anti-rutting test,splitting test and water stability test,then,through changing the mineral material grading,aggregate nominal maximum size,test temperature and other factors,it studies various properties of LSAM.The results show that the change of the nominal maximum particle size has a significant effect on the high-temperature performance of LSAM,and has a lower impact on other road performance indicators,the increase of nominal maximum particle size improves the dynamic stability index of LSAM;the use of intermittent grading LSAM helps improve the dynamic stability index,but the use of dense grading structure is more advantageous for the freeze-thaw splitting strength ratio index and the splitting strength index,and with the increase of ambient temperature,the LSAM compressive rebound modulus of different grades is all significantly decreased.
In order to optimize the road performance of large-size asphalt mixture LSAM,this article conducts the improved large Marshall test,high-temperature anti-rutting test,splitting test and water stability test,then,through changing the mineral material grading,aggregate nominal maximum size,test temperature and other factors,it studies various properties of LSAM.The results show that the change of the nominal maximum particle size has a significant effect on the high-temperature performance of LSAM,and has a lower impact on other road performance indicators,the increase of nominal maximum particle size improves the dynamic stability index of LSAM;the use of intermittent grading LSAM helps improve the dynamic stability index,but the use of dense grading structure is more advantageous for the freeze-thaw splitting strength ratio index and the splitting strength index,and with the increase of ambient temperature,the LSAM compressive rebound modulus of different grades is all significantly decreased.
引文
[1]刘红瑛,叶松,谭发茂,等.大粒径沥青混合料级配离析测量和评价方法[J].郑州大学学报(工学版),2014,35(2):24-27.
[2]邹太平.大粒径密级配沥青混凝土路用性能浅析[J].筑路机械与施工机械化,2013,11(3):67-70.
[3]李彩霞,张争奇.大粒径沥青混合料在旧路补强中的有限元分析[J].武汉理工大学学报(交通科学与工程版),2014,38(4):788-791.
[4]JTG E20-2011,公路工程沥青与沥青混合料试验规程[S].
[5]JTG D50-2017,公路沥青路面设计规范[S].
[6]刘红瑛,戴经梁.不同级配对沥青混合料车辙性能的影响[J].长安大学学报:自然科学版,2004(9):11-15.
[7]江晓霞,覃润浦,高文阳,等.超大粒径沥青混合料级配分形特性与力学指标[J].交通运输工程学报,2013,13(1):7-14.
[2]邹太平.大粒径密级配沥青混凝土路用性能浅析[J].筑路机械与施工机械化,2013,11(3):67-70.
[3]李彩霞,张争奇.大粒径沥青混合料在旧路补强中的有限元分析[J].武汉理工大学学报(交通科学与工程版),2014,38(4):788-791.
[4]JTG E20-2011,公路工程沥青与沥青混合料试验规程[S].
[5]JTG D50-2017,公路沥青路面设计规范[S].
[6]刘红瑛,戴经梁.不同级配对沥青混合料车辙性能的影响[J].长安大学学报:自然科学版,2004(9):11-15.
[7]江晓霞,覃润浦,高文阳,等.超大粒径沥青混合料级配分形特性与力学指标[J].交通运输工程学报,2013,13(1):7-14.