不同聚灰比对聚氨酯混合砂浆拉伸黏接强度的影响  

Effect of different polymer to cement ratio on tensile bonding strength of polyurethane mixed mortar

作　　者：詹贺 陆润之[1,2] 郑杰瑜 谭翰铭 郑玉振 谢镕鲜 赵万程 虞爱平 ZHAN He1,2, LU Runzhi1,2, ZHENG Jieyu 1,2, TAN Hanming1,2, ZHENG Yuzhen 1,2, XIE R ongxian 1.2, ZHAO Wancheng1,2, YU Aiping1,2(1.Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, China; 2.Guilin University of Technology, Guilin 541004, China)

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学,广西桂林541004

出　　处：《混凝土》2018年第3期105-108,共4页Concrete

基　　金：国家大学生创新创业训练计划项目(201610596027);广西建筑新能源与节能重点实验室项目(桂科能15-J-21-7)

摘　　要：系统研究了当聚灰比为0、3%、5%、7%时,聚氨酯混合砂浆的稠度、开孔孔隙率和拉伸黏接强度等指标,利用扫描电镜(SEM)观察了聚氨酯内部聚合物的形貌。试验结果表明,随着聚灰比的增加,砂浆的稠度均有不同程度的降低,吸水率和开孔孔隙率均有不同程度的增加,砂浆拉伸黏接强度先减少后增加,当聚灰比为3%时,砂浆拉伸黏接强度达到最小值。通过SEM分析发现,聚灰比为3%的砂浆试块内部形成大量的纤维网状结构,纤维细小、量多而致密,聚合物分布不均匀,砂浆与基底砂浆接触面积小,导致砂浆的拉伸黏接强度小。The consistency, opened porosity and tensile bonding strength of polyurethane mixed mortar were systematically studied when the polymer to cement ratio are 0,3%, 5% and 7%.This study reveals the structure and morphology of the polymer by SEM scanning electron microscopy analysis.The results indicate that the consistency decreases and the opening porosity increases in different level, and the tensile bonding strength of polyurethane mixed mortar decreases first and then increases with the increase of the polymer to cement ra- tio.It is found that there are many tiny fibrous network structures inside the mortar, and the polymer is unevenly distributed, mortar and the base mortar contact area is small which results in mortar tensile bonding strength is small.

关 键 词：聚氨酯 聚灰比 孔隙率 拉伸黏接强度 扫描电镜 

分 类 号：TU528.01[建筑科学—建筑技术科学]