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• Main Authors: Qi-in Peng, 彭琦茵
• Other Authors: 黃偉慶
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/40878419275868800665

碩士 === 國立中央大學 === 土木工程學系 === 103 === The barriers of facilities which dispose wastes with low radioactivity are mainly composed of concrete. But unlike the normal purpose of concrete, the barrier concrete is expected to be used for more than several hundred years. However, due to Taiwan’s geographic feature, the site of such facilities is likely to be placed in marine environment, which will cause immense influences on the degradation and durability of concrete over a long period of time. In this study, concrete specimens made with mixture possibly used for fabricating high integrity containers or engineered barrier, called HIC, were subjected to chloride ion penetration in one direction. Based on AASHTO T259 test method, the specimens were immersed in NaCl solution and measurement of chloride ion concentration profile at different soaking durations was conducted according to AASHTO T260. Then, Fick’s second law was used to obtain chloride diffusion coefficient and surface chloride content from non-linear regression.. Developed by ACI, Life-365 program predict the service life of the reinforcement concrete structures invaded by chloride ion in marine environment. For Life-365 prediction, the content of pozzolanic materials is a major parameter affecting the service life. In this study, we predict service life referring to Life-365 prediction model and determine material parameters, including diffusion coefficient, diffusion reduction, and increasing model of surface chloride content, using experimental results. Assuming that chloride ions invade into concrete early after curing, the service life of HIC mixture is estimated to be over 1000 years.