| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 95 === The compressive strength is regarded as one estimated indicator of the concrete quality. Generally, we pick compressive specimens and core specimens to estimate the whole quality of structure. If estimating the true quality of concrete by some nondestructive test method that not only does not damage the structure, but can monitor overall for a long time. The first part of this research is to establish the related equation between nondestructive testing and compressive strength of concrete; the second part, put the testing value of the in-place concrete into this equation, then count out the calculated compressive strength, and compare it with real one, finally discuss the feasibility of nondestructive testing to estimating strength. The experimental project mainly includes the ultrasonic wave propagation velocity measurement, rebound hammer, electrical resistivity, compressive strength testing, rapid chloride ion penetration test, Field emission scanning electron microscope (FE-SEM). The results show that the model established by nondestructive techniques using ultrasonic pulse velocity, rebound hammer count and compressive strength, has high degree of relevancy. The compressive strength can be calculate with error of ±10％ and +20％ respectively. It’s referable to calculate the compressive strength with the two methods of nondestructive test. With increasing age, the hydrate fill paste pore and then make concrete dense, increase electrical resistivity , lower the permeability of chloride ions.
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