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1、湖南大学硕士学位论文HPF加固混凝土结构界面粘结性能与施工技术研究姓名：高伟申请学位级别：硕士专业：结构工程指导教师：卜良桃20070401HPF 加固混凝土结构界面粘结性能与施工技术研究 - II - 摘 要 高性能水泥复合砂浆钢筋网（HPF）是一种加固混凝土结构的新型结构加固补强技术。 该方法是在混凝土结构构件表面绑扎钢筋网， 用复合砂浆薄层作为保护和锚固材料，使其共同工作整体受力，以提高结构承载力。与传统的加固方法比较，它凭借其众多的优点，具有广阔的市场应用前景。这种方法存在着新老结构的粘结问题，复合砂浆钢筋网薄层与原有的混凝土结构之间的粘结质量是此类加固工程成功的关键，因此，对界面的粘
2、结性能的研究将具有深远的现实意义。基于此，本文结合湖南省科技厅项目“复合砂浆钢筋网加固 RC 结构粘结机理与剥离理论试验研究”和长沙市科技局重点项目“高性能复合砂浆钢筋网加固混凝土结构构件产业化开发”进行了相关试验研究和理论分析，取得了一些研究成果。主要研究工作如下： 首先采用高性能水泥复合砂浆与混凝土粘结形成标准试块进行劈拉试验， 归纳分析了三种不同的界面处理类型的劈拉破坏形态； 探讨了影响粘结劈拉强度的三种因素的显著性，表明高性能水泥复合砂浆强度对其影响高度显著，界面处理类型一般显著，混凝土强度极不显著；试验结果表明，随着混凝土强度和高性能水泥复合砂浆强度的提高，粘结劈拉强度随之提高，但粘
3、结劈拉强度与它们的比值却随之下降，界面处理形成适当的粗糙度有助于粘结性能的改善；根据试验数据，建立了劈拉强度与最大影响因素砂浆强度的关系模型并引入混凝土强度因素对其进行修正。 其次采用高性能水泥复合砂浆薄层外包混凝土构件形成整体后进行钻芯拉拔拉试验，钻拉破坏发生在修补界面，适度的凿毛处理有助于钻拉强度的提高；探讨了影响粘结钻拉强度的三种因素的显著性，表明既有混凝土构件的强度等级对其影响极不显著，高性能复合砂浆强度等级高度显著，界面剂因素影响更加显著；试验结果表明，粘结界面的钻拉强度随着既有混凝土构件的强度等级和砂浆强度等级的提高而提高； 分析了界面剂和高性能水泥复合砂浆这两个主要影响因素对增强
4、界面粘结性能的作用机理。 再次利用 HPF 加固粘结界面植有剪切销钉的混凝土试件进行剪切试验，研究了销钉的直径、强度、数量对界面粘结性能的增强作用，分析了销钉与 HPF 协同受力的破坏机理， 重点探讨了销钉因素对界面粘结质量的灰关联分析， 给出提高粘结质量的建议。 最后在已有的相关标准基础上，结合采用 HPF 加固混凝土结构的工程实例，提出了合理的施工工艺、施工质量控制与检验的系统方法，有助于提高施工质量和施工程序的规范化，从而推动该新型加固技术的广泛应用。 关键词：高性能水泥复合砂浆钢筋网；加固；混凝土结构；粘结性能；灰关联；施工技术 硕士学位论文 - III - Abstract High
5、 performance ferrocement (HPF) technology is a new method to reinforce the reinforced concrete(RC) structure, by which a kind of high performance composite mortar and reinforcing steel bar mesh are used to repairing and strengthening the RC structure. The latest study proves that HPF technology is a
6、n efficient method to reinforce RC structure, which can obviously increase the load-bearing capacity, stiffness, crack-resisting behavior, so it will be applied widely in construction reinforcement industry. The bonding quality of new repairing layer to old concrete interface is the key to this kind
7、 of reinforcement work. Therefore, the research on bonding quality of adhesion between HPF and concrete has important theoretical meanings and profound significance. The research is carried out by the support of Hunan Science and Technology Department and Changsha Science and Technology Bureau.The m
8、ain archivements of this dissertation are described as follows: Firstly the research is made on splitting tensile behavior of adhesion between high performance composite mortar and concrete. The splitting section arises in the adhesive section and the splitting destruction shape is summarized when t
9、he adhesive section is processed with three methods. Prominent property analysis of influential factors of splitting tensile strength shows cement-mortar strength is more prominent than the process of adhesion section and concrete strength is less. The test results show the splitting tensile strengt
10、h increases with the raise of concrete strength and high performance composite mortar strength, and proper surface roughness of old concrete contributes to the adhesive behavior of high performance composite mortar and concrete. The model of the relationship between the splitting tensile strength an
11、d composite mortar strength is set up according to the test results. Secondly the research is made on tensile behavior of high performance cement-mortar to concrete through core-drilling and pull-stripping test. The destruction shape arises in the adhesive section in the test when the adhesive secti
12、on is processed with three methods, the proper roughness of adhesion section improves the tensile strength. Prominent property analysis of influential factors of tensile strength shows interface cementitious agent is more prominent than composite mortar strength and concrete strength is less. The te
13、st results show the tensile strength increases with the raise of concrete strength and high performance cement-mortar strength. The mechanism of interface cementitious agent and high performance composite mortar to the tensile behavior is analyzed with details. Thirdly the shear experiment is done o
14、n the RC blocks reinforced by HPF, which HPF 加固混凝土结构界面粘结性能与施工技术研究 - IV - includes testing of 10 blocks strengthened with pins and 3 control specimens without pins.It issues of the pins diameter, strength and amount to the bonding behavior. The result of the experiment shows that the pin benefits to
15、improve the bonding quality and ductility. The three chosen factors of the pin influence the bonding behavior of the RC structure reinforced by HPF, and primary and secondary relations between these factors are determined using the mathematical mode in grey degree of incidence in grey theory. On the
16、 basis, some advices are presented to improve the bonding quality. Finally based on the latest and related codes and the successful works reinforce by HPF, the thesis provides the proper construction workmanship of the HPF technology besides the system method of controlling and inspecting the construction quality, which contribute to the enhancement of construction quality and the wide use of the HPF technology. Keywords: High performance ferrocement (HPF); Reinforcement; Reinforce concret
