| Summary: | 碩士 === 朝陽科技大學 === 營建工程系碩士班 === 92 === Concrete always deteriorates due to crack, corrosion, sulfate attack ,and so on, which take place more often in an marine environment. A plenty of research have been conducted dealing with the strengths and basic mechanical properties subjected to exposure environment while few have been done to study the fracture properties due to long term deterioration. It is valid and significant to figure out the fracture toughness of concrete, especially for those power plant structures which are located on the seashore. Furthermore, it is necessary to understand the restoration efficiency of crack on the deteriorated concrete.
This research attempts on investigating the fracture properties of concrete used on the seashore structures for its deterioration after dry-wet corrosion process. The test results show that the variation of strength and wave velocity of those deteriorated concrete and those control set is getting larger as being cured longer. Elastic modulus, load capacity and KIC become higher as the curing duration is longer. In addition, those deteriorated concrete have higher in magnitude compared to those cured in water. But KIC can be restored up to 90％ after being repaired by epoxy. Fracture energy does show a clear trend, but it can be promote the ductility after being repaired.
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