| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 99 === The purpose of this study is to use impact-acceleration responses of the one-dimensional wave transmission behavior corresponding to a free-free resonance condition. The impact wave frequency is obtained by measuring the acceleration signal and transforming it through a FFT
processor. The relation between the impact wave velocity, material density and elastic modulus is utilized. The method is first carried out as pilot tests to confirm its feasibility before it is tested in the soil site.
In this study, steel and cement mortar are the two materials used in experiments. The main purposes include: (1) comparison for different lengths of steel bars impact-tested in air and in soil site; (2) comparison between the dynamic and static modulus values for cement mortar specimens at the same age, utilizing impact tests and standard compression machine;(3) comparison between mortar specimens impact-tested in air and in soil site; (4) impact-testing for strengths of mortar specimens at various curing days, and comparing with ACI empirical formula.
The results obtained from analyzing the impact-acceleration responses shows good agreement between experiments carried out in air and in soil site. It is hoped that such impact testing method can be used conveniently and frequently in field applications.
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