摘要
为了提升改扩建工程沥青面层拼接的耐久性,以延长改扩建路面的使用寿命。首先,基于理论模拟分析方法,明确新老路沥青面层界面拼接技术标准,其次研发耐久性沥青面层界面拼接材料,通过分别制备不同掺量下的矿粉+水性环氧沥青、矿粉+乳化沥青、增强剂+水性环氧沥青3类黏结材料,并采用拉拔强度和劈裂强度试验确定了最佳界面黏结材料与其掺配比例,最后结合实际工程应用和性能跟踪观测进行深入验证。结果表明:沥青面层界面拼接技术标准为“抗拉强度≥0.75 MPa”,且三类界面拼接材料中,水性环氧沥青的黏结性能优于传统的乳化沥青,而矿粉和增强剂的掺入均对材料的黏结性能有所提高;当水性环氧沥青与增强剂的掺比为10∶1时,黏结性能最佳,其劈裂强度较乳化沥青提高145%,工程应用表明,增强型水性环氧沥青的抗拉效果是常规乳化沥青的3.75倍,该材料能够显著提升界面黏结性能。
In order to improve the durability of asphalt surface splicing of reconstruction and expansion project and extend the service life of reconstruction and expansion pavement,firstly,based on the theoretical simulation analysis method,the technical standard of asphalt surface splicing of new and old roads was defined.Secondly,the durable asphalt surface splicing materials were developed.Through the preparation of mineral powder+water-based epoxy asphalt,mineral powder+emulsified asphalt and reinforcer+water under different dosage the best interface bonding material and its mixing proportion were determined by the pull-out strength and splitting strength tests.Finally,the in-depth verification was carried out combined with the actual engineering application and performance tracking observation.The results show that:the technical standard of asphalt surface interface splicing was"tensile strength≥0.75 MPa".And among the three types of interface splicing materials,the bonding performance of waterborne epoxy asphalt was better than that of traditional emulsified asphalt,while the addition of mineral powder and reinforcing agent improves the bonding performance of the material.When the mixing ratio of waterborne epoxy asphalt and reinforcing agent is 10∶1,the bonding performance is the best,and the splitting strength is higher than that of emulsified asphalt.The engineering application shows that the tensile effect of the reinforced waterborne epoxy asphalt is 3.75 times that of the conventional emulsified asphalt,which means the material could significantly improve the interfacial bonding performance.
作者
金光来
冯雯雯
JIN Guanglai;FENG Wenwen(Jiangsu Sinoroad Engineering Research Institute Co.,Ltd.,Nanjing,Jiangsu 211806,China)
出处
《公路工程》
2022年第6期121-129,共9页
Highway Engineering
基金
江苏省基础研究计划(自然科学基金)——青年基金项目(BK20180114)。
关键词
高速公路改扩建
界面拼接
理论模拟
增强型水性环氧沥青
工程应用
freeway reconstruction and expansion
interface splicing
theoretical simulation
enhanced waterborne epoxy asphalt
engineering application
