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PCM堆焊方法的实际应用角度出发，评估了复合材料试件在恶劣环境条件下的长期性能。考虑环境条件，定量测量含硅粉和不含硅粉的复合材料试件的界面剪切和拉伸强度；高温、潮湿和冻融循环。复合材料试件制备完毕后，经过充分养护和相应的暴露条件，利用自动记录仪进行试验（劈裂拉伸和剪切试验），以评价特定条件下混凝土与PCM之间的界面粘结强度。此外，还对有硅粉和无硅粉作为修复材料的加固RC梁进行了四点弯曲试验，以模拟材料水平试验，旨在将硅粉应用于实际PCM加固技术中。加固材料采用三种类型：钢筋、CFRP网格和CFRP绞线片作为加强筋。将应变片安装在加强件和主加强件上以获得应变分布。使用带有或不带有硅粉的特定加强筋的 PCM 加强 RC 梁的性能在不同的头下进行了比较，即。破坏模式、载荷挠度关系、极限载荷、脱粘载荷以及沿梁的加强筋的应变值和应变分布。计算了考虑基底混凝土-覆盖材料之间完美粘结的加固梁的极限荷载，并与试验结果进行了比较。