摘要
为解决溶解性胶粉改性沥青高温性能降低和纳米材料分散性不足的问题,采用高分散活性纳米ZnO对其进行复合改性,探究纳米ZnO对溶解性胶粉改性沥青性能的影响和分散效果。制备不同改性沥青并分析改性沥青黏温特性、黏弹特性和低温蠕变特性。同时,从微观形貌和官能团角度分析改性剂在沥青熔融体中的分布状态和相互作用机理。结果表明:掺入高分散活性纳米ZnO后复合改性沥青的黏温指数降低2.3%,永久变形量降低57.4%,在-12℃和-18℃条件下的纳米ZnO蠕变劲度模量提升10.3%和9.2%,低温蠕变变化速率降低6.7%和4.6%。可见纳米ZnO改善了溶解性胶粉改性沥青的高温抗变形性能和温度敏感性,而低温性能降低,但仍可适用于-18℃环境。高分散活性纳米ZnO加入后促进胶粉的溶解,复合改性沥青中胶粉粒径减小;胶粉在沥青中脱硫解聚,表现出化学改性效果,复合改性后沥青中并未发生新的化学反应,改性作用主要表现为物理填充和促进胶粉脱硫解聚反应。
In order to solve the problem of reduced high temperature performance of Terminal Blend crumb rubber modified asphalt and insufficient dispersion of nanomaterials,highly dispersed active nano-ZnO was used to modify Terminal Blend crumb rubber modified asphalt.Additionally,the performance of the modified asphalt and the dispersibility of the modifier were investigated.Different modified asphalts were prepared and the viscosity-temperature characteristics,viscoelastic characteristics and low temperature creep characteristics of modified asphalts were analyzed.At the same time,the distribution and interaction of modifiers in asphalt were analyzed from the perspective of microstructure and functional groups.The results show that the viscosity-temperature index of the composite modified asphalt decreases by 2.3%after adding highly dispersed active nano-ZnO.Compared with the Terminal Blend crumb rubber modified asphalt,the permanent deformation of the composite modified asphalt is reduced by 57.4%,the creep stiffness modulus is increased by 10.3%and 9.2%at-12℃and-18℃,and the low temperature creep rate is reduced by 6.7%ang 4.6%.It can be seen that nano-ZnO improves the high-temperature deformation resistance and temperature sensitivity of Terminal Blend crumb rubber modified asphalt,while the low-temperature performance is reduced,but it can still be applied to the-18℃environment.The addition of highly dispersed active nano-ZnO promoted the dissolution of crumb rubber,and the particle size of crumb rubber in composite modified asphalt decreased.The Terminal Blend crumb rubber in asphalt show chemical modification effect.But the nano-ZnO is manifested as physical filling and promoting the desulfurization and depolymerization of crumb rubber.
作者
季荣一
宋佳康
郑木莲
袁月明
张泽浩
韩昭
JI Rong-yi;SONG Jia-kang;ZHENG Mu-lian;YUAN Yue-ming;ZAHNG Ze-hao;HAN Zhao(Key Laboratory of Highway Engineering in Special Areas,Ministry of Education,Chang an University,Xi’an 710064,China;Shandong Expressway Construction Management Group Co.,Ltd.,Jinan 250014,China)
出处
《科学技术与工程》
北大核心
2025年第30期13114-13121,共8页
Science Technology and Engineering
基金
国家自然科学基金(52378430)
山东省交通科技项目(HS2022B072)。
关键词
复合改性沥青
胶粉
纳米材料
流变性能
改性机理
composite modified asphalt
crumb rubber
nanomaterials
rheological properties
modification mechanism
