Qiu Xin, Deng Jianghui, Fu Qinghong, Lou Yunxi, Ye Yingci, Zhang Dingchuan
College of Engineering, Zhejiang Normal University, Jinhua 321004, China.
Materials (Basel). 2025 Jan 2;18(1):156. doi: 10.3390/ma18010156.
Asphalt pavement, widely utilized in transportation infrastructure due to its favourable properties, faces significant degradation from chloride salt erosion in coastal areas and winter deicing regions. In this study, two commonly used asphalt binders, 70# base asphalt and SBS (Styrene-Butadiene-Styrene)-modified asphalt, were utilized to study the chloride salt erosion effect on asphalt pavement by immersing materials in laboratory-prepared chloride salt solutions. The conventional properties and adhesion of asphalt were assessed using penetration, softening point, ductility, and pull-off tests, while Fourier transform infrared spectroscopy (FTIR) elucidated the erosion mechanism. The Marshall stability test, freeze-thaw splitting test, and Cantabro test were applied to study the effects of chloride exposure on the strength, water stability, and structural integrity of the asphalt mixture. Finally, the grey correlation analysis was employed to assess the impact of chloride salt erosion on the performance of asphalt binders and mixtures. The findings highlight that chloride salt erosion reduces penetration and ductility in both types of asphalt binders, raises the softening point, and weakens asphalt-aggregate adhesion, confirmed as a primarily physical effect by FTIR analysis. Asphalt mixtures showed decreased strength and water stability, intensifying these impacts at higher chloride concentrations and longer erosion duration. SBS-modified asphalt binders and mixtures exhibited greater resistance to chloride salt erosion, particularly in adhesion, as demonstrated by the Cantabro and pull-out tests. Grey relational analysis revealed that erosion duration is the most influential factor, with and softening point emerging as the most responsive indicators of chloride-induced changes. These findings offer critical insights for practice, providing evidence-based guidance for designing and constructing asphalt pavements in environments with high chloride levels.
由于具有良好的性能，沥青路面在交通基础设施中得到广泛应用，但在沿海地区和冬季除冰区域会因氯盐侵蚀而出现严重退化。在本研究中，使用两种常用的沥青结合料，即70#基础沥青和SBS（苯乙烯-丁二烯-苯乙烯）改性沥青，通过将材料浸泡在实验室制备的氯盐溶液中来研究氯盐侵蚀对沥青路面的影响。使用针入度、软化点、延度和拉拔试验评估沥青的常规性能和粘附性，同时利用傅里叶变换红外光谱（FTIR）阐明侵蚀机理。采用马歇尔稳定度试验、冻融劈裂试验和坎塔布罗试验研究氯暴露对沥青混合料强度、水稳定性和结构完整性的影响。最后，采用灰色关联分析评估氯盐侵蚀对沥青结合料和混合料性能的影响。研究结果表明，氯盐侵蚀会降低两种类型沥青结合料的针入度和延度，提高软化点，并削弱沥青与集料的粘附性，FTIR分析证实这主要是一种物理效应。沥青混合料的强度和水稳定性降低，在较高氯浓度和较长侵蚀持续时间下这些影响会加剧。SBS改性沥青结合料和混合料对氯盐侵蚀表现出更大的抗性，尤其是在粘附性方面，坎塔布罗试验和拉拔试验证明了这一点。灰色关联分析表明，侵蚀持续时间是最具影响力的因素，针入度和软化点是对氯诱导变化最敏感的指标。这些研究结果为实际应用提供了关键见解，为在高氯环境中设计和建造沥青路面提供了基于证据的指导。
