超高性能钢纤维水泥基复合材料-高延性水泥基材料复合梁的制备及弯曲性能  

Preparation and bending properties of coupled beam made by UHPFRCC and high ductility cementitious composites

作　　者：马瑞[1] 郭丽萍[1,2,3] 谌正凯 李天宇[1] 孙伟[1,2,3] Ma Rui Guo Liping Chen Zhengkai Li Tianyu Sun Wei(School of Materials Science and Engineering, Southeast University, Nanjing 211189, China Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China Collaborative Innovation Center of Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China)

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点实验室,南京211189 [3]东南大学江苏省先进土木工程材料协同创新中心,南京211189

出　　处：《东南大学学报（自然科学版）》2017年第2期377-383,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51378113;51438003);东南大学大学生课外学术科技作品竞赛资助项目

摘　　要：研究了无配筋条件下超高性能钢纤维水泥基复合材料(UHPFRCC)与高延性水泥基复合材料(HDCC)复合梁试件的弯曲变形性能.通过纯剪切强度测试,比较了界面处理工艺对界面粘结性能的影响.通过弯拉实验测试了复合梁试件在弯曲载荷下的变形性能,并与纯UHPFRCC梁的变形能力进行对比.结果表明,不同的界面处理工艺决定了界面粘结性能.最佳的界面处理方法能使界面粘结强度高于HDCC基体本身强度,界面过渡区基体致密,没有明显的微观缺陷.UHPFRCC-HDCC复合梁在弯拉荷载下,极限抗弯强度达到13.4 M Pa,跨中最大挠度为2.8mm.HDCC能通过自身的多缝开裂增加裂缝数目来改善变形能力.与UHPFRCC梁相比,UHPFRCC-HDCC复合梁弯曲时,塑形变形明显,并具有更大的弯曲挠度.The deformation property under bend-loading of a coupled beam specimen prepared by ultra-high performance fiber reinforced cementitious composite（ UHPFRCC） with high ductility cementitious composite（ HDCC） and without steel rebar was investigated. The effects of different interfacial treatments on the bond property between UHPFRCC and HDCC were evaluated by the pure sheer strength test,the deformation properties of specimens under tensile-bending loading were tested and compared with the pure UHPFRCC beam. The results showthat the interfacial treatment dominates the bond. The bonding strength is stronger than that of HDCC matrix followed the optimal method,the interface transition zone is compacted without obvious micro-defects. The ultimate flexure strength of the coupled beam is 13. 4 MPa under tensile-bending loading,with the maximum deflection of 2. 8 mm. The numbers of cracks are increased by the multiple cracking happened on HDCC to improve the plastic deforming properties. Compared with the pure UHPFRCC beam,the UHPFRCC-HDCC coupled beam has more obvious plastic deforming and larger deflection under tensilebending loading.

关 键 词：高延性水泥基材料 超高性能钢纤维水泥基复合材料 复合梁 弯曲挠度 界面剪切强度 

分 类 号：TU528.31[建筑科学—建筑技术科学]