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Experimental investigation on the effect of natural tropical weather on interfacial bonding performance of CFRP-concrete bonding system

机译:自然热带气候对CFRP-混凝土粘结体系界面粘结性能影响的试验研究

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摘要

The existing reinforced concrete structures may require rehabilitation and strengthening to overcome deficiencies due to defect and environmental deterioration. Fibre Reinforced Polymer (FRP)-concrete bonding systems can provide solution for the deficiencies, but the durability of the bonded joint needs to be investigated for reliable structural performance. In this research the interfacial bonding behaviour of CFRP-concrete system under tropical climate exposure is main interest. A 300 mm concrete prism was bonded with CFRP plate on its two sides and exposed for 3, 6, and 9 months to laboratory environment, continuous natural weather, and wet-dry exposure in 3.5% saltwater solution at room and 40 °C temperature. The prisms were subjected to tension and compression load under bonding test to measure the strain and determine stress distribution and shear stress transfer behaviour. The results of the bonding test showed that load transfer was fairly linear and uniform at lower load level and changed to non-linear and non- uniform at higher load level. The force transfers causes the shear stress distribution being shifted along the bonded length. The combination of climate effects may have provided better curing of the bonded joints, but longer duration of exposure may be required to weaken the bond strength. Nevertheless, CFRP-concrete bonding system was only minimally affected under the tropical climate and salt solution.
机译:现有的钢筋混凝土结构可能需要修复和加固,以克服由于缺陷和环境恶化而引起的缺陷。纤维增强聚合物(FRP)-混凝土粘结系统可以为缺陷提供解决方案,但是需要研究粘结接头的耐用性以实现可靠的结构性能。在这项研究中,CFRP-混凝土系统在热带气候暴露下的界面粘结行为是主要兴趣所在。将300毫米混凝土棱镜的两面与CFRP板粘合在一起,并在实验室环境,连续自然天气以及在室温和40°C的3.5%盐水中进行干湿暴露的情况下放置3、6和9个月。棱镜在粘结试验下承受拉伸和压缩载荷,以测量应变并确定应力分布和剪切应力传递行为。粘结测试的结果表明,在较低的载荷水平下,载荷传递是相当线性且均匀的,而在较高的载荷水平下则变为非线性和非均匀的。力的传递导致剪切应力分布沿粘结长度方向移动。气候影响的结合可能提供了粘合接头的更好固化,但是可能需要更长的暴露时间才能削弱粘合强度。然而,在热带气候和盐溶液中,CFRP-混凝土粘结系统的影响最小。

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