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Emad Kassem Lorena Garcia Cucalon Eyad Masad Dallas Little 《International Journal of Pavement Engineering》2018,19(12):1111-1124
The quality of the interfacial bonding between asphalt binder and aggregates plays a significant role in determining the durability of asphalt mixtures. Warm mix asphalt (WMA) modifiers have been used extensively in the last decade primarily to reduce production and compaction temperatures as well as to improve workability of asphalt mixtures. This study aimed to provide better understanding of the effects of these WMA modifiers on the interfacial bonding between asphalt binders and aggregates. The evaluation focused on measuring surface energy of binders in unaged and aged states and aggregates and then calculating energy parameters that describe the potential of a given asphalt-aggregate combination to resist fatigue cracking and moisture damage. Results show that the combination of asphalt-WMA additive, as well as the content applied of WMA additive has a significant impact on the fatigue cracking and moisture damage resistance. The results suggest that it is poor practice to use a given type and percentage of WMA modifier without regard for binder type. Instead, test methods are recommended to evaluate the compatibility of asphalt binder, WMA additive type/content, and aggregates for improved performance at different conditions. 相似文献
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选择Sasobit和Evotherm 3G两种温拌剂对温拌LDPE沥青混合料制备工艺和性能进行研究。首先,比较变温等体积法和等黏温度法两种方法,并确定两种温拌混合料的拌和及击实温度。在此基础上,分别采用车辙试验、低温弯曲试验、中点加载弯曲试验以及冻融劈裂试验评价70#、LDPE、Sasobit-LDPE以及3G-LDPE四种沥青混合料的高温性能、低温性能、疲劳性能和水稳定性。结果表明,两种温拌技术均是可行的,Sasobit和3G温拌技术可使施工温度降低20℃和15℃。与热拌LDPE沥青混合料相比,Sasobit温拌沥青混合料具有更好的高温性能和水稳定性,在高应力比条件下抗疲劳性能更好,低温性能虽变差,但是优于70#沥青混合料;3G温拌沥青混合料的高温性能,低温性能以及水稳定性则与热拌LDPE沥青混合料各项性能较为接近,抗疲劳性能变差,但是优于70#沥青混合料。 相似文献
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目的 研究温拌沥青混合料的性能,为温拌沥青混合料在工程中应用提供可以参考的数据和理论依据.方法 采用马歇尔试件体积设计方法进行配合比设计,确定最佳沥青用量,以最佳沥青用量制作试件对其进行力学性能和路用性能试验研究.结果 以马歇尔试验确定的温拌沥青混合料的最佳油石比为4.5%,以最佳油石比拌制的温拌沥青混合料力学性能和路用性能能够满足规范要求,并且动稳定度超过了同样配合比的热拌沥青混合料.结论 在降低拌和温度的情况下,温拌沥青混合料的力学性能和路用性能可以满足规范要求,并且动稳定度得到提高,温拌沥青混合料具有很好的工程应用前景. 相似文献
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