为进一步提升路用水性树脂改性乳化沥青服役性能,促进其在工程实践中的应用,全面调查了路用水性树脂改性乳化沥青材料的材料选配与制备工艺,系统梳理了不同类型水性树脂对乳化沥青路用性能提升效果,揭示了水性树脂对乳化沥青的改性机理。研究表明,当前研究沥青主要选用70#基质沥青,乳化剂主要选用阳离子慢裂型乳化剂;水性树脂主要选用水性环氧树脂(WER),其次为水性聚氨酯(WPU);水性树脂掺量主要集中在5%～20%;掺加水性树脂可提升乳化沥青蒸发残留物的基本性能、力学性能与高温流变性能,其中WER可显著增强其拉伸强度和黏结强度,WPU可赋予材料更优的柔韧性,而WER/WPU复合改性可使材料保持强度的同时兼具柔韧性;水性树脂改性乳化沥青改性机理以物理共混为主,同时伴随化学反应。
To enhance the service performance of waterborne resin-modified emulsified asphalt for road constructions and promote its practical engineering applications,this paper comprehensively investigated the material selection and preparation techniques of waterborne resin-modified emulsified asphalt for road applications.The enhancement effects of different waterborne resins on the road performance of emulsified asphalt were identified,and the modification mechanisms were revealed.It was demonstrated that 70# base asphalt and cationic slow-set emulsifiers were predominantly employed in current research.Among waterborne resins,waterborne epoxy resin (WER) was the most widely used,followed by waterborne polyurethanes (WPU).The dosage of waterborne resin was mainly 5%-20%.The incorporation of waterborne resins enhanced the fundamental properties,mechanical performance,and high-temperature rheology of emulsified asphalt residue.In particular,WER significantly improved tensile and bonding strength,and WPU imparted superior flexibility to the materials.Moreover,composite modification with WER/WPU enabled the material to maintain strength while also achieving good flexibility.The modification mechanism of waterborne resin modified emulsified asphalt was mainly physical blending,accompanied by chemical reaction.
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基金资助
陕西省创新能力支撑计划项目(2022TD-07);太行城乡建设集团有限公司科技项目(KT-2);中央高校基本科研业务费专项资金项目(300102215203)
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