ABSTRACT

Adhesiveness is a property that directly affects the service life of asphalt pavements. Over the years, different materials, research methods and tests have been used to investigate different adhesiveness aspects of materials. This paper investigated two asphalt binders, one with and one without amine-based anti-stripping agent, as well as two aggregate sources. The objective was to investigate the effects of rheology (stiffness and rutting) of the asphalt binder and adhesiveness of asphalt binders to different substrates on the resistance to moisture conditioning. The results indicated that moisture conditioning reduced the average stiffness of the binders by about 15% for both binders. The addition of amine-based anti-stripping agent reduced the stiffness of the neat binder by approximately 9%, and at 82°C the neat binder presented higher rutting resistance if compared to the modified binder using anti-stripping agent. The aggregate area within the HMAs in contact with asphalt binder did not show a good correlation with the pull-off tensile strength in the dry condition, but it presented good correlation after moisture conditioning. This suggests that adhesion force itself may not be greatly affected by the proper contact between aggregate and binder, but such contact does help preventing moisture damage in the interface.

摘要

附着力是直接影响沥青路面使用寿命的一种性能。多年来，已经使用不同的材料、研究方法和测试来研究材料的不同粘合性方面。本文研究了两种沥青粘合剂，一种含胺基抗剥离剂，一种不含胺基抗剥离剂，以及两种集料来源。目的是研究沥青粘合剂的流变性（刚度和车辙）以及沥青粘合剂对不同基材的粘合性对耐湿调节性的影响。结果表明，湿度调节使两种粘合剂的平均刚度降低了约 15%。添加胺基抗剥离剂使纯粘合剂的刚度降低了约 9%，如果与使用抗剥离剂的改性粘合剂相比，纯粘合剂在 82°C 时表现出更高的抗车辙性能。HMAs内与沥青结合料接触的骨料面积与干燥条件下的拉断抗拉强度没有表现出良好的相关性，但在水分调节后表现出良好的相关性。这表明粘附力本身可能不会受到骨料和粘合剂之间适当接触的很大影响，但这种接触确实有助于防止界面中的水分损坏。