Effects of an Amine Anti-Stripping Agent on Moisture Susceptibility of Sasobit and Aspha-Min Mixes by Surface Free Energy Analysis
Effects of an Amine Anti-Stripping Agent on Moisture Susceptibility of Sasobit and Aspha-Min Mixes by Surface Free Energy Analysis
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DOI：
10.1520/jte103618
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发表时间：
2012-01
影响因子：
1.2
通讯作者：
M. Mitchell;R. Link;Aravinda Buddhala;Z. Hossain;N. Wasiuddin;M. Zaman;E. O’Rear
中科院分区：
文献类型：
--
作者：
M. Mitchell;R. Link;Aravinda Buddhala;Z. Hossain;N. Wasiuddin;M. Zaman;E. O’Rear
温拌沥青 (WMA) 是一项相当新的技术，主要是为了解决与传统热拌沥青 (HMA) 摊铺相关的高蒸汽排放和高能源成本等问题而开发的。尽管通过现场和实验室评估，WMA 正在成为一种流行的摊铺技术，但许多研究人员和运输人员对其防潮性能感到担忧。本研究分析了八种不同集料和用不同剂量的两种温拌添加剂（即 Sasobit 和 Aspha-Min）改性的沥青结合料之间的粘合自由能或润湿能力。 Sasobit 在干燥条件下的粘合自由能最大增加了 20.9%，平均增加了 12.8%。还评估了湿气存在下的粘附力（称为还原自由能），以了解 WMA 的湿气敏感性。还原自由能越低，沥青粘合剂在湿气存在下与集料脱粘的倾向就越低。对于含有 3% Sasobit 的沥青粘合剂，观察到还原自由能最大降低 20.5%，平均降低 13.2%。然而，Aspha-Min 并未对任何表面特性表现出任何显着影响。研究了一种胺基抗剥离剂 AD-here HP Plus，以评估其对 WMA 的附着力和潮湿敏感性的影响。虽然其作为抗剥落剂的性能在普通沥青粘合剂上表现良好，但 AD-here HP Plus 并没有提高所选用 WMA 添加剂改性的粘合剂在干燥或潮湿条件下的附着力。潮湿和干燥条件下的粘合自由能对所选骨料要么有害，要么没有影响，表明 AD-here HP Plus 对 WMA 添加剂改性粘合剂有负面影响或没有影响。
Warm mix asphalt (WMA) is a fairly recent technology developed primarily to address issues such as high vapor emissions and high energy costs associated with the traditional hot mix asphalt (HMA) paving. Although the WMA is becoming a popular paving technology through field and laboratory evaluations, many researchers and transportation personnel are concerned about its moisture resistance. The present study analyzes the free energy of adhesion or wetting ability between eight different aggregates and an asphalt binder modified with varying dosages of two warm mix additives, namely Sasobit and Aspha-Min. Sasobit showed a maximum of 20.9 % and an average of 12.8 % increase in the free energy of adhesion in dry condition. The adhesion in the presence of moisture, referred to as free energy of reduction, was also evaluated to understand the moisture susceptibility of the WMA. The lower the free energy of reduction, the lower the asphalt binder’s tendency to de-bond from aggregates in the presence of moisture. A maximum of 20.5 % and an average of 13.2 % decrease in the free energy of reduction were observed for asphalt binder with 3 % Sasobit. However, Aspha-Min did not exhibit any significant effect on any of the surface properties. One amine-based anti-stripping agent, AD-here HP Plus, is studied to evaluate its effect on adhesion and moisture susceptibility of the WMA. While its performance as an anti-stripping agent was good on the plain asphalt binder, AD-here HP Plus did not improve the adhesion of the selected binder modified with WMA additives either in dry or wet condition. The free energy of adhesion in wet and dry conditions showed either detrimental or no effect with selected aggregates, suggesting a negative or no influence of AD-here HP Plus on the WMA additive-modified binder.