【作者】 王曙光； 陈羽； 郑文华；

【Author】 WANG Shuguang;CHEN Yu;ZHENG Wenhua;Institute of Foundation Engineering, China Academy of Building Research;Disaster Prevention Research Center, Ministry of Housing and Urban-Rural Development;National Engineering Research Center of Building Technology;

【机构】 中国建筑科学研究院有限公司地基基础研究所； 住房和城乡建设部防灾研究中心； 国家建筑工程技术研究中心；

【摘要】 玄武岩纤维复合筋(BFRP)具有强度高、质量轻、耐腐蚀等优点,是一种绿色环保的高性能筋材。在玄武岩纤维复合筋的基础上引入了碳纤维,制备了玄武岩纤维碳纤维混杂筋(B/CFRP),提高了筋材刚度并具有一定的延性,有利于其在混凝土结构中的推广应用。B/CFRP筋通常与混凝土、砂浆、水泥净浆等共同组成构件、共同承载,不发生粘结破坏是构件承载的前提。为探究B/CFRP筋与混凝土、砂浆、水泥净浆的粘结性能,按玄武岩纤维和碳纤维10∶1的混杂比制备了直径为16mm的B/CFRP筋,并分别制作了B/CFRP筋与水泥净浆、M20砂浆、M30砂浆、C25混凝土、C35混凝土的试件,并对其进行拔出试验。试验结果表明,B/CFRP筋与水泥净浆的粘结强度最低,与砂浆的粘结强度次之,与混凝土的粘结强度最高;B/CFRP筋与水泥净浆及砂浆试件的拔出试验破坏模式为拔出破坏,与混凝土试件的拔出试验破坏模式为劈裂破坏;粘结-滑移曲线分为滑移段、下降段和残余段;提出粘结滑移本构关系,并给出相关参数取值建议,为B/CFRP筋在混凝土结构及岩土工程应用提供理论与技术参考。更多还原

【Abstract】 Basalt fiber reinforced polymer(BFRP) rebars have the advantages of high strength, light weight and corrosion resistance, and are a kind of green and environmentally friendly high-performance reinforcement. On the basis of BFRP rebars, carbon fibers were introduced to prepare basalt fiber-carbon fiber hybrid rebars(B/CFRP), which increased the stiffness of the reinforcement and had certain ductility, which was conducive to its promotion and application in concrete structures. B/CFRP rebars are usually combined with concrete, mortar, cement paste, etc. to form components and bear loads together. The absence of bond failure is a prerequisite for the load-bearing of components. To explore the bond performance of B/CFRP rebars with cement paste, mortar and concrete, B/CFRP rebars with a diameter of 16mm were prepared at a hybrid ratio of basalt fiber to carbon fiber of 10:1, and specimens of B/CFRP rebars with cement paste, M20 mortar, M30 mortar, C25 concrete and C35 concrete were made and pull-out tests were conducted.The test results show that the bond strength of B/CFRP rebars with cement paste is the lowest, followed by that with mortar, and the highest with concrete; the failure mode of the pull-out test of B/CFRP rebars with cement paste and mortar specimens is pull-out failure, and that of the pull-out test of B/CFRP rebars with concrete specimens is splitting failure; the bond-slip curve is divided into the slip stage, the descending stage and the residual stage; a bond-slip constitutive relationship is proposed, and suggestions for the relevant parameter values are given, providing theoretical and technical references for the application of B/CFRP rebars in concrete structures and geotechnical engineering.更多还原