不同添加剂型高模量沥青混合料模量及疲劳性能对比研究

Comparative Study on Modulus and Fatigue Performance of High Modulus Asphalt Mixtures with Different Additives

摘要: 针对高模量添加剂稂莠不齐的现状，为科学合理进行添加剂型高模量沥青混合料模量和疲劳参数指标设计，促进其在实际工程中推广应用，采用AMPT和UTM两种实验设备对6种添加剂型高模量沥青混合料进行动态模量和四点弯曲疲劳试验，对不同添加剂型高模量沥青混合料的模量及疲劳性能研究，建立混合料动态模量主曲线和疲劳曲线，预测混合料的高低温性能和疲劳寿命。研究结果表明：EME添加剂型高模量沥青混合料的高温抗车辙性能更优、疲劳寿命更好；PR Module和YJW-6添加剂型高模量沥青混合料的高温性能、疲劳寿命相近；混合料抗疲劳性能及对于应变水平变化的敏感性EME型 > PR Module型 > YJW-6型；70#基质沥青与高模量添加剂拌和后的混合料模量和相位角数据均优于SBS改性沥青，高模量添加剂在改善基质沥青的高温性能和黏弹性能方面具有更好的效果。

Abstract: Aiming at the current situation of uneven high modulus additives, in order to scientifically and ra-tionally design the modulus and fatigue parameters of additive-type high-modulus asphalt mixture, and promote its popularization and application in practical engineering, two kinds of experimental equipment, AMPT and UTM, were used to conduct dynamic modulus and four-point bending fatigue tests on 6 kinds of additive-type high modulus asphalt mixtures. The modulus and fatigue performance of different additive-type high modulus asphalt mixtures were studied and the main dynamic modulus curve and fatigue curve of the mixture were established, to predict the high and low temperature performance and fatigue life of the mixture. The research results show that: EME additive type high modulus asphalt mixture has better high-temperature rutting resistance and better fatigue life; the high temperature performance and fatigue life of PR module and YJW-6 additive type high modulus asphalt mixture are similar; the anti-fatigue performance of the mixture and the sensitivity to changes in strain level EME > PR Module > YJW-6 type; the modulus and phase angle data of 70# matrix asphalt mixed with high modulus additives are better than SBS modified asphalt. High modulus additives have better effects in improving the high temperature performance and viscoelastic properties of matrix asphalt.