Experimental Study on Mix Proportion and Mechanical Properties of High-strength Asphalt Concrete
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维普
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为提升沥青混合料高温强度,降低变形与疲劳病害风险,延长无砟轨道使用寿命,分别就胶结料和级配对沥青混合料高温强度的影响展开研究.结果表明:10%的RP(Rubber&Plastic)添加剂加入到胶结料中,可以使70号沥青软化点升高54.4℃,沥青胶浆70℃下的抗车辙因子提高37倍,AC-13沥青混合料60℃动稳定度提升8.2倍,70℃动稳定度从难以测出提高到5 456 次/mm;使I-D改性沥青软化点升高37.8℃,AC-13沥青混合料60℃动稳定度提升2.7倍,70℃动稳定度提升2.0倍以上.进行斜剪试验,不同胶结料对混合料的斜剪破坏荷载有一定影响,但幅度远低于动稳定度间的差别,RP对动稳定度的提升与其提升了混合料的弹性变形能力有关.对比AC(Asphalt Concrete)、SMA(Stone Mastic Asphalt)和ESMA(Enhanced Stone Mastic Asphalt)三种级配,ESMA级配沥青混合料高温强度最高.高强度沥青混合料的抗开裂性较70号沥青AC-13沥青混合料有较大幅度提高.
In order to improve the high-temperature strength of asphalt mixtures,reduce the risk of deformation and fatigue diseases,and extend the service life of ballastless tracks,research was conducted on the effects of binder and gradation on the high-temperature strength of asphalt mixtures.The results showed that adding 10%RP(Rubber&Plastic)additive to the binder can increase the softening point of 70#asphalt by 54.4℃,improve the anti-rutting factor of asphalt emulsion by 37 times below 70℃,increase the dynamic stability of AC-13 asphalt mixture by 8.2 times at 60℃,and increase the dynamic stability from difficult measuring to measuring with 5456 times/mm at 70℃.The softening point of I-D modified asphalt was raised by 37.8℃,the dynamic stability of AC-13 asphalt mixture was improved by 2.7 times at 60℃,and the dynamic stability was increased by more than 2 times at 70℃.Through conducting oblique shear tests,different binders have a certain impacts on the oblique shear failure load of the mixture,but the amplitude is much lower than the difference between dynamic stability.The improvement of RP on dynamic stability may be related to the enhancement of the elastic deformation ability of the mixture.Comparing the three gradations of AC(Asphalt Concret),SMA(Stone Mastic Asphalt),and ESMA(Enhanced Stone Mastic Asphalt),the ESMA gradation asphalt mixture has the highest high-temperature strength.The cracking resistance of high-strength asphalt mixture is also significantly improved compared to No.70 asphalt AC-13 asphalt mixture.
维普
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