摘要
磷酸盐水泥(magnesium phosphate concrete,MPC)是一种新型无机胶凝材料,具有快硬、早强等优点。为了将微细钢纤维增强和碳纤维织物网格增强磷酸盐水泥基复合材料的优异性能更好地应用于混凝土结构修补加固领域,研究了两种MPC复合材料与旧混凝土的双面剪切性能,得到了其极限荷载及破坏模式,分析凿糙、开槽、植筋3种不同界面处理方式和不同旧混凝土强度等级对两种MPC复合材料与旧混凝土界面黏结性能的影响规律。结果表明:3种界面处理方式均能不同程度地改善界面黏结性能,其中界面的凿糙处理效果最好,其次是开槽处理;微细钢纤维增强磷酸盐水泥基复合材料与旧混凝土黏结界面凿糙、植筋和开槽处理相对于界面未处理的平均抗剪强度提升幅度,最大为284.31%、196.08%和250.98%;碳纤维织物增强磷酸盐水泥基复合材料与旧混凝土黏结界面凿糙、植筋和开槽处理相对于界面未处理的平均抗剪强度提升幅度,最大为306.38%、195.74%和221.28%。
Magnesium phosphate cement(MPC),a new kind of inorganic cementing material,has some special performance such as rapid setting,fast hardening,and low drying shrinkage,etc.In order to apply the excellent performance of micro steel fiber reinforced phosphate cement matrix composites and carbon fiber fabric reinforced phosphate cement matrix composites to the repair and reinforcement of concrete structures,the double-sided shear performance of two MPC composite materials bonded with old concrete was studied,and the ultimate loads and failure modes were analyzed.Besides,the influence of three different interface treatments(roughing,grooving and bar planting)and different old concrete strength grades on the bonding properties were analyzed.The test results show that all three interface treatment methods can improve the bonding performance of the interface to varying degrees,among which the interface roughness treatment is the best,followed by grooving.Compared to the average value,the increases in shear strength for the bonding interface with the treatment of roughing,planting and grooving between the micro-steel fiber reinforced phosphate cement matrix composite material and the old concrete reach up to 284.31%,196.08%and 250.98%,respectively.The increases in shear strength for the bonding interface with the treatment of roughing,planting and grooving between the carbon fiber fabric reinforced phosphate cement matrix composite material and the old concrete reach up to 306.38%,195.74%and 221.28%,respectively.
作者
蔡炜
方海
刘伟庆
莫立武
吴万开
CAI Wei;FANG Hai;LIU Weiqing;MO Liwu;WU Wankai(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;College of Material Science and Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期443-450,共8页
Journal of Building Structures
基金
国家自然科学基金面上项目(51578285,51778285)
江苏省自然科学基金面上项目(BK20161545)
关键词
微细钢纤维
碳纤维织物
磷酸盐水泥
旧混凝土
静力试验
黏结性能
micro steel fiber
carbon fiber fabric
phosphate cement
old concrete
static test
bonding performance
作者简介
蔡炜,出生于1994年,男,硕士研究生,主要从事复合材料结构的研究。email:caiweinjut@163.com;通信作者:方海,出生于1981年,男,工学博士,教授,主要从事复合材料结构研究。email:fanghainjut@163.com
