新型加固材料在建筑混凝土楼板粘接加固工程中的应用  

Application of new reinforcing materials in concrete floor reinforcement project of existing buildings

作　　者：张馨予 李超 林锦眉 吴宇静 ZHANG Xinyu;LI Chao;LIN Jinmei;WU Yujing(Guangzhou Huali University,Guangzhou 511325,China)

机构地区：[1]广州华立学院,广东广州511325

出　　处：《粘接》2023年第3期65-68,共4页Adhesion

基　　金：2016年广东省重点学科培育项目(项目编号:发文号:[粤教研函2017]1号);2021年广东省教育科学规划课题(项目编号:2021GXJK374)。

摘　　要：为探讨将磷酸镁水泥直接用于楼板加固的技术可行性,研究了不同骨料的磷酸镁混凝土的物理力学性能,并评价了其加固混凝土板的效果。结果表明,从试件单轴受压破坏形态来看,磷酸镁混凝土(LC1~LC3)的破坏形态更松散,呈现为中部锥形破坏特征,破坏面特征与骨料类型有关,碎石骨料表现为水泥与碎石之间的粘接破坏,陶粒骨料表现为陶粒的剪切破坏。从试件单轴受压应力-应变曲线来看,磷酸镁混凝土弹性模量与强度略有弱化,脆性破坏特征更明显,且磷酸镁混凝土的强度随着陶粒与陶砂掺量的增加而增强。磷酸镁混凝土加固楼板的正常使用荷载提升了1.66~1.71倍,刚度较C40加固板略有不足;但变形性能更优异、自重更轻。In order to explore the technical feasibility of using magnesium phosphate cement directly for slab rein⁃forcement,the physical and mechanical properties of magnesium phosphate concrete with different aggregates were studied,and the effect of reinforced concrete slabs was evaluated.The test results showed thatfrom the uniaxial com⁃pression failure mode of the specimen,the failure mode of magnesium phosphate concrete(LC1~LC3)wasmore loose,showing the middle cone failure characteristics,and the failure surface characteristics were related to the ag⁃gregate type.The crushed stone aggregate showed the bond failure between cement and crushed stone,and the ce⁃ramsite aggregate showed the shear failure of ceramsite.From the uniaxial compressive stress-strain curve of the specimens,the elastic modulus and strength of magnesium phosphate concrete were slightly weakened,and the brit⁃tle failure characteristics were more obvious,and the strength of magnesium phosphate concrete increased with the increase of ceramic particles and ceramic sand.The normal service load of magnesium phosphate concrete reinforced floor slab was increased by 1.66~1.71 times,and the stiffness was slightly less than that of C40 reinforced slab,but the deformation performance was better and the self-weight was lighter.

关 键 词：楼板加固 磷酸镁混凝土 改性 轻骨料 

分 类 号：TU472.4[建筑科学—结构工程] TQ437.1[建筑科学—土工工程]