| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 102 === Prior research by many knowns to add the carbon fiber can become a conductor in specimens,not only greatly reduce the resistance value of the mortar specimen, and can measure the resistance through the way that the degree of specimen deformation under stress. When the specimens compressed with loading will lead to pull-out or push-in between the carbon fiber and mortar,pull-out caused resistance value increased,while push-in caused lower resistance values.But loading rates and cycles of change in resistance rarely mentioned in the paper.Therefore,this paper at different loading rates and loading times for different experiments and compare the impact of each specimen resistance change.In the experiment,using of four specimens were generally coating carbon fiber mortar beam specimens,general and nano carbon fiber mortar cylindrical specimens,general carbon fiber concrete cylindrical specimen.In measurement methods, were also analyzed and compared for the two-wire and four-wire.The results show that both types of carbon fibers. At the same strain,loading rates faster would made change in electrical resistance smaller.When loading more times in the same strain,change in electrical resistance will tend to be unstable.In the measurement method,using four-wire much stable than two-wire.
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