硅灰增强混杂纤维水泥基灌浆料与老混凝土粘结强度研究  

Study on bond strength of silica fume reinforced hybrid fiber cement based grouting materialand old concrete

作　　者：乔庆浩 李志华[1] 张聪[1,2,3] QIAO Qinghao;LI Zhihua;ZHANG Cong(School of Environment&Civil Engineering,Jiangnan University,Wuxi 214122,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430000, China;State Key Laboratory of Green Building Materials, Beijing 100024, China)

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430000 [3]绿色建筑材料国家重点实验室,北京100024

出　　处：《功能材料》2020年第6期6143-6149,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51908247);江苏省自然学基金资助项目(BK20170192);硅酸盐建筑材料国家重点实验室开放基金资助项目(SYSJJ2017-11);绿色建筑材料国家重点实验室开放基金资助项目(YA-616)。

摘　　要：通过四因素四水平正交试验进行硅灰增强混杂纤维水泥基灌浆料与老混凝土粘结强度的研究,选取硅灰掺量、钢纤维类型、钢纤维掺量和PVA纤维掺量作为研究因素,设定相应的水平。对粘结试块进行双面剪切试验和劈裂抗拉试验,运用极差分析上述因素和相应水平对粘结强度的影响。结果表明,当硅灰掺量为9%、长度35 mm端钩型钢纤维掺量为1.2%、PVA纤维掺量为0.5%时,粘结强度显著。基于正交试验结果,通过四组对比试验,研究了纤维对水泥基灌浆料与老混凝土粘结的界面剪切特性和劈拉破坏形态的影响。结果表明,当长度35 mm端钩型钢纤维与PVA纤维掺量分别为1.2%和0.5%混杂时,粘结试块的剪切变形性能和劈裂抗拉强度显著提高,表现出较强的粘结性能。Through the four-factor and four-level orthogonal experiment,the bond strengthof silica fume reinforced hybrid fiber cement based grouting material and old concrete was studied.The silica fume content,steel fiber type,steel fiber content and PVA fiber content were selected as the research factors,and the corresponding levels were set.Through the double-sided shear test and splitting tensile testofbonding test blocks,the effects of the above factors and their corresponding levels on the bond strength were analyzed by the range analysis.The results showed that when the content of silica fume was 9%,the content of end-hook steel fiber with a length of 35mm was 1.2%,and the content of PVA fiber was0.5%,the bond strength was remarkable.Based on the results of orthogonal experiment,the effects of fiber on the interfacial shear characteristics and split tension failure patterns of cementbased grouting materialand old concrete were studied through four comparative experiments.The results showed that the shear deformation and splitting tensile strength of bonding test blocks were significantly improved when the mixing content of end-hook steel fiberwith a length of 35mm and PVA fiber was 1.2%and 0.5%respectively,showing strong bond performance.

关 键 词：正交试验 硅灰 混杂纤维 水泥基灌浆料 粘结强度 

分 类 号：TU502.6[建筑科学—建筑技术科学]