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RC構造物の補強に用いるPCM-コンクリート界面の革新的接着工法

用于加固 RC 结构的 PCM-混凝土界面的创新粘合方法

基本信息

批准号：
20J20854
负责人：
Mizan Mahmudul Hasan
金额：
$ 1.98万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-24 至 2023-03-31
项目状态：
已结题

项目摘要

From the perspective of practical application of PCM overlaying method, long-term performance of composite specimens was evaluated under severe environmental conditions. The quantitative measurement of interfacial shear and tensile strength of the composite specimen with and without silica fume was done considering environmental conditions; elevated temperature, moisture and freeze-thaw cycle. After preparation of the composite specimen, sufficient curing and corresponding exposure conditions, tests (splitting tensile and shear test) was performed with autograph to evaluate interfacial bond strength between concrete and PCM under particular condition. In addition, four-point bending tests of strengthened RC beam with and without silica fume as repaired material was conducted to resemble material level test with the aim to use silica fume in practical PCM strengthening technique. Three type of strengthening material: reinforcement, CFRP grid and CFRP strand sheet was used as a strengthening bar. Strain gauges was attached to the strengthening and the main reinforcement to get strain distribution. The performance of PCM strengthened RC beams using particular strengthening bars with or without silica fume were compared under different heads, viz. failure modes, load deflection relationship, ultimate load, debonding load and, strain value and strain distribution of the strengthening bar along the beam. The ultimate load of strengthened beams considering perfect bond between substrate concrete-overlay material were also calculated and compared with the experiment results.

从实际应用的角度出发，对复合材料试件在恶劣环境条件下的长期性能进行了评价。考虑到环境条件，高温，湿度和冻融循环的复合材料试样的界面剪切和拉伸强度的定量测量与硅灰。在制备复合材料试件、充分养护和相应的暴露条件下，采用自行设计的劈拉和剪切试验，评价特定条件下混凝土与PCM的界面粘结强度。此外，为了将硅灰应用于PCM加固技术中，进行了硅灰修补前后加固钢筋混凝土梁的四点弯曲试验，以模拟材料水平试验。采用钢筋、碳纤维格栅和碳纤维布三种加固材料作为加固筋。在加固部位和主筋上分别贴上应变片，得到应变分布。比较了不同强度等级的混凝土梁在不同荷载作用下的破坏形态、荷载-挠度关系、极限荷载、剥离荷载以及加固筋沿梁沿着方向的应变值和应变分布。计算了考虑基层混凝土与覆盖层良好粘结的加固梁的极限承载力，并与试验结果进行了比较。