| Summary: | 碩士 === 淡江大學 === 土木工程學系碩士班 === 93 === This study was developed to understand the adhesion between an exterior roof water proof coating of manufactured polymer materials and the concrete substrate. The experiments on the adhesion mechanism can be conducted using pull-off, peer, scratch, indentation and blister tests. Because the mechanisms of the tests are quite different, there would be no unique theory to interpret the adhesion data. This study uses an analytical model from the failure energy theory and the pull-off strength measurements to monitor the adhesion between the coating and the concrete base. The theoretical model suggested by Hsueh (2002) can be used to discuss the influence factors and the temperature effects. One can compare the strain energy release rate with the energy of rupture to determine whether the adhesion fails or not. The tests help to show the effects of temperature, thickness of the coating and roughness of the substrate.
The analysis of coating-substrate failure models and the experiments revealed that (1) the Young’s modulus of the coating material and its thickness affect interface adhesion the most. The lower the Young’s modulus was, the higher the failure probability would be. Greater coating thickness would reduce the adhesion to yield failure. (2) Raising or dropping the temperature to a limit could enlarge the adhesion strength of the coating. (3) Both the Poisson’s ratio of the coating and the coating width has minor effects on the adhesion. (4) The pull-off strength tests can be used to verify the influences of the variables suggested in the theoretical model.
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