【摘要】 聚乙烯(PE)纤维是制备超高延性水泥基复合材料(ECC)的常用材料之一。然而，由于PE纤维表面的憎水性，限制了其与基体间界面黏结性能，导致PE纤维强度利用率低。为研究硅烷偶联剂对改善纤维与基体界面黏结性能的效果，共设计27组单根纤维拉拔试验，研究了硅烷偶联剂、纤维埋置深度、水胶比对界面黏结性能的影响。结果表明：KH550和KH902两种硅烷偶联剂均能够提高纤维与基体的界面黏结强度；与未改性纤维相比，KH550改性后界面黏结强度提高17.09%,KH902改性后界面黏结强度提高40.91%,即KH902的改善效果更显著；随着纤维埋置深度的增加，纤维拉拔峰值荷载逐渐增大，但界面黏结强度逐渐降低；当水胶比为0.40时的纤维与基体的界面黏结效果最佳。更多还原

【Abstract】 Polyethylene(PE) fiber is the preparation of high ductility cement-based composite materials(ECC) of one of the commonly used materials. However, due to the hydrophobicity of the surface of PE fiber, the interface bonding performance between PE fiber and matrix is hampered, causing poor strength utilization of PE fiber. In order to study the effect of silane coupling agent on enhancing the interface bonding performance of fiber and matrix, 27 sets of single fiber pulling tests are designed to study the effects of silane coupling agent, embedment depth of fiber and water-binder ratio on the interface bonding performance. The results indicate that both KH550 and KH902 silane coupling agents can enhance the interfacial bonding stringency between fiber and matrix. Compared with the unmodified fiber, the interface bond strength improved by 17.09% after modification of KH550 and 40.91% after modification of KH902, that is, the enhancement effect of KH902 is more significant. With the increase of fiber embedment depth, the fiber drawing peak load increases gradually, but the interface bonding strength decreases gradually. When the water-binder ratio is 0.40, the interface bonding effect between fiber and matrix is the best.更多还原