表面预处理PVA纤维改性沥青的高温流变特性

1.甘肃路桥建设集团有限公司,甘肃兰州730030;2.长安大学材料科学与工程学院,陕西西安710061;3.甘肃省公路交通建设集团有限公司,甘肃兰州730030

道路工程;改性沥青;聚乙烯醇;纤维;流变性能;表面预处理

High temperature rheological properties of surface pretreated PVA fiber modified asphalt
ZHANG Wei1,ZHANG Zhao2,CAO Hui3,XIE Junjie1,XU Huaxin1,NIU Dongyu2

1.Gansu road and Bridge Construction Group Co. Ltd., Lanzhou 730030, Gansu Province, P. R. China;2.School of Materials Science and Engineering, Chang’an University, Xi’an 710061, Shaanxi Province, P. R. China;3.Gansu Highway Traffic Construction Group Co. Ltd., Lanzhou 730030, Gansu Province, P. R. China

road engineering; modified asphalt; polyvinyl alcohol; fiber; rheological properties; surface pretreatment

DOI: 10.3724/SP.J.1249.2022.04409

备注

为改善聚乙烯醇(polyvinylalcohol,PVA)纤维与沥青的相容性,采用KH-570硅烷偶联剂对PVA纤维进行了表面预处理,并通过接触角、旋转黏度、温度扫描、多重应力蠕变(multiplestresscreepandrecovery,MSCR)和线性振幅扫描(linearamplitudesweep,LAS)等试验,对比研究了不同掺量下原样PVA纤维(T)改性沥青和表面处理后的PVA纤维(ST)改性沥青的相容性及高温流变性能,以此评价表面处理工艺对于PVA纤维改性沥青流变性能的影响.结果表明,表面处理工艺增大了沥青和PVA纤维的相容性;相同掺量下,相较于T,ST的增黏效果、抗车辙性能以及抗永久变形能力更优,在较低应变水平下可提高沥青的疲劳寿命,但在高应力水平重复荷载作用下,T和ST对于沥青的蠕变变形能力和疲劳寿命均没有明显改善.所采用的表面预处理工艺可有效提高胶结料整体的储存稳定性、黏度和高温抗变形能力,研究结果为PVA纤维改性沥青的制备及应用提供了参考.
In order to improve the compatibility of polyvinyl alcohol (PVA) fiber and asphalt in application of asphalt pavement, the surface of PVA fiber is pretreated with KH-570 silane coupling agent. The tests such as contact angle, rotational viscosity, temperature scanning, multiple stress creep and recovery (MSCR) and the linear amplitude sweep (LAS) are conducted to study the compatibility and high temperature rheological properties of original PVA fiber (T) and surface treated PVA fiber (ST) modified asphalts with different contents, so as to evaluate the effect of surface modification process on the rheological properties of PVA fiber modified asphalt. The results show that the surface treatment process improves the compatibility of asphalt and PVA fiber. Compared with T, ST has better viscosity increasing effect, rutting resistance, and permanent deformation resistance at the same content,and can slightly improve the fatigue resistance of asphalt at the lower strain level. However, T and ST have no obvious improvement on creep deformation ability and fatigue life of asphalt at high stress level under repeated load. The surface pretreatment process can effectively improve the storage stability, viscosity and high temperature deformation resistance of the binder and the results provide reference for the preparation and application of PVA fiber modified asphalt.
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