Evaluation of the Interface Quality of Concrete Structures Strengthened by Steel Plates

• Main Authors: Chu-Chang Lin, 林居璋
• Other Authors: 林宜清
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/16720641044246040590

碩士 === 國立中興大學 === 土木工程學系所 === 95 === The objective of this thesis is to investigate the feasibility of using the impact-echo method for determining the repair quality of the concrete structures strengthened by steel plates. The concrete structures after damage often need to be strengthened. The bond between the repair material and the original concrete is the key factor to determine the repair quality. In this thesis, concrete structures were strengthened with steel plates. To simulate bad bond quality, thin styrofoam sheets were placed at specific locations at the epoxy resin layer between steel plates and concrete. The impact-echo tests were carried out and a technique called the approximate transfer function was used to normalize the impact-echo spectra. Experimental results show that the approximate transfer function analysis of impact-echo tests is capable of identifying the degree of the difference in the void content at the interface of repaired structures. The use of the impact-echo method for evaluation of the bond quality of at the epoxy resin interface of repaired structures is promising. Destructive shear tests were also performed to verify the results obtained from the impact-echo tests. A comparison between the shear test results and those of the impact-echo tests shows that the residual adhesive strength of the strengthened structures is reduced as the bad bond quality exists at the repair interface, which can be detected by the impact-echo method.