基于温拌沥青技术的苯乙烯-丁二烯-苯乙烯嵌段共聚物/橡胶粉复合改性沥青应力吸收层层间性能

将3种不同的温拌剂添加到苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）/橡胶粉复合改性沥青中，并拌和相应的应力吸收层混合料成型后制得复合式试件，通过黏度试验评价了不同温拌剂对SBS/橡胶粉复合改性沥青降黏效果的影响，通过层间拉拔试验、剪切试验和剪切疲劳试验分析了温拌SBS/橡胶粉复合改性沥青混合料应力吸收层层间性能的变化特性。结果表明，温拌剂的降黏效果由优到劣的顺序依次为:Evotherm-3 G、Sasobit-LM、Aspha-min，温拌沥青技术并不影响常温环境下复合改性沥青应力吸收层层间的黏结性能和抗剪性能；高温及水浴环境会导致不同应力吸收层层间力学强度明显降低，且不同温拌剂复合改性沥青应力吸收层的层间拉拔强度和抗剪强度存在差异，其中温拌剂Evotherm-3 G和Sasobit-LM能够增强应力吸收层层间的力学强度；相对于SBS/橡胶粉复合改性沥青的应力吸收层，添加温拌剂会缩短应力吸收层混合料的层间剪切疲劳寿命，Sasobit、Aspha-min和Evotherm-3 G温拌复合改性沥青应力吸收层的层间剪切疲劳寿命分别缩短了约10.0%、17.4%和2.7%。

Interlaminar properties of stress absorbing layer with styrene-butadiene-styrene/crumb rubber co-modified asphalt based on warm mix asphalt technology

Three warm-mixed agents were added into the styrene-butadiene-styrene block polymer (SBS)/crumb rubber (CR) composite modified asphalt, and the composite specimen was made of stress absorbing layer mixture with the resulting modified asphalt. The viscosity reduction effect of different warm-mixed agents on SBS/CR composite modified asphalt was evaluated by the viscosity test and the variation characteristics of interlaminar properties of stress absorbing layer with SBS/CR composite modified asphalt were studied by the pull-out test, shear test and interlaminar shear fatigue test. The results showed that the viscosity reduction effect of warm mixing agent on SBS/CR composite modified asphalt from good to bad was followed by Evotherm-3 G, Sasobit-LM and Aspha-min. The bonding property and shear resistance of stress absorbing layer of composite modified asphalt under normal condition was not affected by warm mix asphalt technology, and the interlaminar properties of different stress absorbing layer were evidently descended under high temperature condition and bath environment. The interlaminar pull strength and shear strength of stress absorbing layer of composite modified asphalt modified by different warm mixing agents had some differences, and the addition of Evotherm-3 G and Sasobit-LM could strengthen the interlaminar mechanical strength of stress absorbing layer. Compared with stress absorbing layer of SBS/CR composite modified asphalt, the interlaminar shear fatigue of stress absorbing layers of composite modified asphalts modified by Evotherm-3 G, Sasobitt-LM and Aspha-min decreased by 10.0%, 17.4% and 2.7%, respectively.