为探究环氧沥青混合料的耐酸雨侵蚀性能及作用机理,采用周期干湿循环浸泡实验、接触角实验和路用性能实验对环氧沥青混合料、SBS改性沥青混合料和70#基质沥青混合料的耐酸雨侵蚀性能进行研究。结果表明,酸雨可显著降低沥青的粘附性、沥青混合料的路用性能和老化耐久性。与SBS改性沥青和70#基质沥青相比,环氧沥青与集料间的粘附性最优,其混合料的耐酸雨侵蚀能力最强,且可应用于OGFC沥青混合料。环氧沥青具有的极性基团、高强内聚力和低收缩率的热固性树脂可使其粘附性增强,从而有效抵御水分的侵蚀、剥落和温度应力开裂。废橡胶粉和改性竹纤维的加入可使环氧沥青混合料中的“结构沥青”增多、空隙率降低而具有良好的致密性,形成的空间网络结构可起“加筋”和“增韧”作用,进一步增强混合料的力学性能、抗渗性能和耐酸雨侵蚀能力。
To research the acid rain resistance and mechanism of epoxy asphalt mixture,the acid rain resistance of epoxy asphalt mixture,SBS modified asphalt mixture and 70# base asphalt mixture were studied by wet and dry cyclic immersion test,contact angle test and road performance test.The results shown that acid rain can significantly reduce the adhesion of asphalt,and the road performance and aging durability of asphalt mixture.Epoxy asphalt had the best adhesion with the aggregate,and its mixture had the strongest acid rain resistance,and can be used in OGFC asphalt mixture.The epoxy asphalt had the polar groups,high-strength cohesion and low-shrinkage thermosetting resins that can enhance its adhesion,thereby effectively resisting water erosion,spalling and temperature stress cracking.With the addition of waste rubber powder and modified bamboo fiber,the “structural asphalt” in the epoxy asphalt mixture increased,the void ratio decreased,and it had good compactness.The spatial network structure formed can play the role of “reinforcement” and “toughening”,further enhancing the mechanical properties,impermeability and acid rain resistance of the mixture.
[1] 赵志龙.我国酸雨状况及综合防治对策研究[J].矿冶,2007,16(3):63-68.
[2] 王晓鹏.酸雨对沥青及沥青混合料的侵蚀破坏机理研究[D].长沙:长沙理工大学,2014.
[3] 黎正富.水、酸、盐溶液对沥青老化的影响研究[D].长沙:长沙理工大学,2018.
[4] 袁仁峰,蔡燕霞,臧芝树.酸雨侵蚀作用对沥青混合料路用性能影响研究[J].公路交通科技(应用技术版),2019(2):67-70.
[5] 张倩,胡建荣,彭余华.酸雨腐蚀沥青混合料中矿料的化学机理分析[J].公路,2004(2):104-106.
[6] 张倩,孟晓荣,闫雯.降水对沥青结合料组分影响的化学机制分析[J].西安建筑科技大学学报(自然科学版),2010,42(5):669-673,695.
[7] 冯新军,陈安迪,王晓鹏,等.酸雨对沥青技术性能的影响及侵蚀机理研究[J].公路,2017,62(4):223-228.
[8] 郝增恒,李璐,盛兴跃,等.基于高温固化的环氧沥青开发及性能表征[J].化工新型材料,2017,45(10):208-210.
[9] 张庆,郝培文,白正宇.水性环氧树脂改性乳化沥青制备及其黏附性研究[J].公路交通科技,2015,32(9):9-14.
[10] 钱振东,刘长波,唐宗鑫,等.短切玄武岩纤维对环氧沥青及其混合料性能的影响[J].公路交通科技,2015,32(6):1-5.
[11] Using surface energy measurements to select materials for asphalt pavement[R].Washington D C,TRB,2006.
[12] Zhu J C,Zhang K,Liu K F,et al.Adhesion characteristics of graphene oxide modified asphalt unveiled by surface free energy and AFM-scanned micro-morphology[J].Construction and Building Materials,2020,244:118404.
[13] Liu M,Mao X,Zhu H,et al.Water and corrosion resistance of epoxy-acrylic-amine waterborne coatings:effects of resin molecular weight,polar group and hydrophobic segment[J].Corrosion Science,2013,75:106-113.
[14] 丁安心,李书欣,倪爱清,等.热固性树脂基复合材料固化变形和残余应力数值模拟研究综述[J].复合材料学报,2017,34(3):471-485.
