超粘抗剪乳化沥青稀浆混合料稳定性研究  

Stability of super-viscous and shear resistant emulsified asphalt slurry mixture

作　　者：李秀君[1] 崔灿 张恒 彭天平 宋明洋 LI Xiujun;CUI Can;ZHANG Heng;PENG Tianping;SONG Mingyang(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;China MCC5 Group Corp.Ltd.,Chengdu 610063,China;Anhui Transport Consulting&Design Institute Engineering Wisdom Maintenance Technology Co.,Ltd.,Hefei 230041,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]中国五冶集团有限公司,成都610063 [3]安徽省交规院工程智慧养护科技有限公司,合肥230041

出　　处：《上海理工大学学报》2024年第6期667-676,共10页Journal of University of Shanghai For Science and Technology

基　　金：上海市自然科学基金资助项目(23ZR1444000)。

摘　　要：针对基面层间易发生脱粘和水损病害,通过自主设计拉拔和扭剪试验,研究下封层超粘抗剪乳化沥青(super-viscous and shear resistant emulsified asphalt,SEA)稀浆混合料高温稳定性和水稳定性,并结合分子动力学对SEA改性机理进行分析。结果表明:SEA稀浆下封层混合料高温敏感度较低,相较于基质乳化沥青,60℃条件下其稀浆下封层抗拉强度和抗剪强度分别增加156.81%和88.17%;且SEA稀浆混合料相较于基质乳化沥青稀浆混合料和SBS改性乳化沥青稀浆混合料经干湿循环后其层间抗拉和抗剪强度基本丧失,仍有约干燥条件下的60%,极大地改善了稀浆下封层水稳定性。SEA中PU分子的异氰酸酯基与沥青中的羟基发生化学反应而连接,又因其自身链状结构使沥青中极性组分聚集更加紧密,从而增大沥青胶团的粘聚性。在受到水分侵蚀稀浆混合料时,SEA中SBR通过自生聚集行为形成胶网结构,从而达到减弱水分子对沥青胶浆入侵的目的,提高下封层水稳定性。In order to solve the problems of debonding and water loss between base course and surface course,the high temperature stability and water stability of super-viscous and shear resistant emulsified asphalt(SEA)slurry mixture were studied by self-designed pull-out test and shear test,and the modification mechanism of SEA was analyzed by molecular dynamics.The results show that the high temperature sensitivity of SEA slurry seal mixture is low.Compared with the matrix emulsified asphalt,the tensile strength and shear strength of SEA slurry seal mixture at 60℃are increased by 156.81%and 88.17%,respectively.Compared with the matrix emulsified asphalt slurry mixture and the SBS modified emulsified asphalt slurry mixture,the interlaminar tensile and shear strength of the SEA slurry mixture basically loses after dry-wet cycle still has about 60%of that under dry conditions,which greatly improves the water stability of the slurry seal.The isocyanate groups of PU molecules in SEA react with the hydroxyl groups in asphalt,which makes the polar components in asphalt gather more closely because of its own chain structure,thus increasing the cohesiveness of asphalt micelle.When the slurry mixture is eroded by water,the SBR in SEA forms the glue net structure through the self-generated aggregation behavior,so as to achieve the purpose of reducing the invasion of water molecules to the asphalt mortar and improve the water stability of the lower seal coat.

关 键 词：超粘抗剪乳化沥青 拉拔试验 扭剪试验 分子动力学 

分 类 号：U414[交通运输工程—道路与铁道工程]