Analytical study of silane-based and wax-based additives on the interfacial bonding characteristics between natural rubber modified binder and different aggregate types

Ashiru Sani , Mohd Rosli Mohd Hasan , Khairul Anuar Shariff , Najib Mukhtar , Mohammad Nishat Akhtar , Ikenna D. Uwanuakwa , Qingli Dai , Tracy Leh Xin Wong
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Abstract

The modification of asphalt binder with natural rubber latex (NR) significantly improves the rutting and fatigue resistance of asphalt mixtures. However, NR-modified binder is prone to low workability and wettability due to its high viscosity. Therefore, this research focuses on examining the influences of silane and wax-based additives on the wettability of natural rubber-modified binders and the binder-aggregates adhesion performances. In this study, experimental and analytical approaches were used. The contact angles of asphalt binder were measured using a goniometer through the sessile drop method with three solvents: deionised water, formamide, and glycerol. The C++ algorithm was adopted to compute the surface free energy (SFE) elements of the asphalt binder. Analytical methods were employed to analyse the results based on the Young-Dupre equation, followed by linear regression to establish a correlation between the compatibility ratio (CR) and the SFE components. The results inferred that modified asphalt binders with additives possessed improved moisture resistance, wherein dry work adhesion values were less than 210 ​mJ/m2 under granite interfaces, whereas the limestone interface exhibited higher dry adhesion values of 340 ​mJ/m2 and below. Similar performance results were observed under wet adhesion conditions; with granite wet adhesive values observed below 120 ​mJ/m2, while limestone wet adhesion values were ascertained below 180 ​mJ/m2 for all tested samples and conditions. According to the spread–ability coefficient results, the limestone interface has greater spread-ability than granite interfaces. Meanwhile, compatibility ratio values indicated better compatibility of 1.9 or higher for tested samples under granite interfaces, whereas compatibility values of 1.7 and below were observed under limestone interfaces. Among the SFE components studied for correlation with CR, the acidic SFE component demonstrated excellent correlations (with R2 values greater than 0.91) under all ageing conditions. An inclusion of micro-level additive enhanced binder adhesion properties, resulting in a more resilient asphalt pavement.

硅烷基和蜡基添加剂对天然橡胶改性粘结剂与不同骨料界面结合特性的分析研究
天然橡胶胶乳对沥青结合料的改性显著提高了沥青混合料的抗车辙和抗疲劳性能。然而,NR改性的粘合剂由于其高粘度而易于降低可加工性和润湿性。因此,本研究的重点是考察硅烷和蜡基添加剂对天然橡胶改性粘合剂润湿性和粘合剂-集料粘附性能的影响。在这项研究中,使用了实验和分析方法。沥青结合料的接触角是用角度计通过固定滴法在去离子水、甲酰胺和甘油三种溶剂下测量的。采用C++算法计算了沥青结合料的表面自由能单元。采用基于Young-Dupre方程的分析方法对结果进行分析,然后进行线性回归,以建立相容性比(CR)与SFE成分之间的相关性。结果表明,添加添加剂的改性沥青结合料具有更好的防潮性能,干硬性粘合值小于210​在花岗岩界面下为mJ/m2,而石灰石界面表现出更高的干粘附值,为340​mJ/m2及以下。在湿粘附条件下观察到类似的性能结果;观察到花岗岩湿粘合值低于120​mJ/m2,而石灰石的湿粘附值被确定为低于180​mJ/m2。根据扩展能力系数结果,石灰岩界面比花岗岩界面具有更大的扩展能力。同时,相容性比值表明,在花岗岩界面下测试样品的相容性较好,为1.9或更高,而在石灰岩界面下观察到的相容性值为1.7或更低。在研究与CR相关性的SFE成分中,酸性SFE成分在所有老化条件下都表现出优异的相关性(R2值大于0.91)。微观添加剂的加入增强了粘合剂的粘合性能,使沥青路面更有弹性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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