EME2高模量沥青混合料性能对比试验研究

Comparative Test on EME2 High Modulus Asphalt Mixture Performance and Recommendation Index

目的对EME2沥青混合料的级配设计、性能指标进行对比试验,并提出EME2沥青混合料设计推荐指标及技术要求.方法针对不同沥青混合料设计方法的差异,采用不同沥青混合料设计方法进行筛分试验及级配设计,并对体积指标、水稳定性、高温稳定性、模量性能、疲劳性能、低温性能进行了对比试验.结果对于连续级配中国沥青混合料筛分方法可以代替法国的筛分方法;不同沥青混合料级配设计方法的体积指标有较大的关联性.EME2沥青混合料的水损坏性能可以用冻融劈裂和AASHTOT283试验代替法国多列士试验进行评价;高温抗车辙性能可以采用中国车辙试验(70℃,轮压1.0 MPa)以及汉堡试验进行评价;力学性能可以采用动态模量(温度15℃,频率10 Hz)进行控制以及采用4点弯曲疲劳试验代替法国的两点弯曲试验进行疲劳性能评价;低温性能则可以采用低温弯曲小梁试验进行低温评价.结论EME2沥青混合料具有良好的水稳定性、抗高温抗车辙性能、较高的模量的力学性能、抗疲劳性能,同时满足其低温指标的要求,表明EME2沥青混合料是一种可值得推荐和推广的沥青混合料.

In this paper,the gradation design and performance index for asphalt pavement design methods in China and France are compared and studied.The recommended indexes and technical requirements of EME2 asphalt mixture design are put forward.According to the difference of asphalt mixtures design methods,the screening experiment and gradation design were carried out tocompare the volume index,water stability,high temperature stability,modulus of performance,fatigue performance,low temperature performance.Results showthat for the continuous gradation,the screening method of China＇s asphalt mixture can be used instead of the French screening method.The volume indexes of gradation design methods of different asphalt mixtures have great relevance.Water damage performance of EME2 asphalt mixture can be measured by freeze-thawsplitting test and AASHTOT283 test instead of French Thorez test.The Chinese rut test（temperature70 ℃,wheel pressure 1.0 MPa） and Hamburg test can be used to evaluate the high temperature rutting resistance.The Mechanical performance can be controlled by the dynamic modulus（15 degrees,10 Hz）,and the Fatigue performance was evaluated by using a four-point bending fatigue test in place of the two-point bending test in France.The low temperature performance can be evaluated by the low temperature bend beam test.EME2 asphalt mixture has good water stability,high temperature rutting,high modulus mechanical properties,fatigue resistance,and satisfy the low temperature requirements that EME2 asphalt mixture is a worthy of recommendation and promotion of asphalt mixture.