| 摘要: |
| 为研究海盐湿热耦合作用对沥青集料界面体系的损伤效应，分析了盐溶液类型、浓度、浸泡时间对沥青集料界面体系抗拉强度、沥青膜剥落率、自愈能力以及自愈后水稳定性的影响，探讨了盐湿热环境下沥青集料界面体系的损伤机理.结果表明：沥青膜厚度为6μm的沥青集料试样抗拉强度最大，可作为后续模拟试验的标准试样；随着盐侵蚀时间的延长，沥青集料试样抗拉强度逐渐减小，沥青膜剥落率逐渐上升，并且在前期变化速率较大，之后逐渐趋于稳定；60℃高温烘干能够有效地恢复沥青集料的界面强度，但因集料表面受到溶液的侵蚀，自愈之后的水稳定性明显下降，海盐溶液的腐蚀性越强，水稳定性越差；溶液的综合剥落功越大，沥青集料试样抗拉强度越高，沥青膜剥落率越低，说明海盐溶液的腐蚀特征和表面张力特征均会影响其损伤效应. |
| 关键词: 多孔沥青混凝土 沥青集料界面体系 盐侵蚀 抗拉强度 损伤机理 |
| DOI：103969/j.issn.1007 9629202006023 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51878079） |
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| Analysis of the Damage Effect of Sea Salt Erosion on Asphalt Aggregate Interfacial System in Hygrothermal Environment |
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ZHOU Zhigang, LI Haojia, LIU Xin, HE Wenli
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Key Laboratory of Road Structure and Material of Transport Industry, Changsha University of Science & Technology, Changsha 410114, China
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| Abstract: |
| To study the damage effect of sea salt humid heat coupling effect on the asphalt aggregate interfacial system, the influence of saline solution type, concentration and immersion time on the tensile strength of the asphalt aggregate interfacial system, the stripping ratio of the asphalt film, the self healing ability, and the water stability after self healing were compared. The damage mechanism of the salt humid heat environment to asphalt aggregate interface system was comparatively analyzed. The results show that the asphalt aggregate specimen with 6μm asphalt film thickness has the highest tensile strength and can be used as control for subsequent simulation test. With the increase of salt erosion time, the tensile strength decreases gradually, and the strip ratio of asphalt film gradually increases. In the early stage, their change rate is larger, and then gradually become stable. The high temperature drying on 60℃ can effectively recover the interfacial strength of the asphalt aggregate. However, due to the solution erosion effect on the aggregate surface, the water stability after self healing is significantly reduced. The more corrosive the sea salt solution is, the worse water stability of the self healing specimen will be. The comprehensive stripping work is greater, the tensile strength of the asphalt aggregate interface is higher and the stripping ratio of the asphalt film is lower, which indicates that the corrosion characteristics and surface tension characteristics of the sea salt solution will influence its damaging effect. |
| Key words: porous asphalt concrete asphalt aggregate interfacial system salt erosion tensile strength damage mechanism |
