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 Effect of Chemical Degradation on Microstructural Changes and Transport Properties of Concrete - Phenomenological Study
Tác giả hoặc Nhóm tác giả: Quoc Tri Phung
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Nơi đăng: 14th FEA PhD Symposium, Ghent University, Belgium; Số: .;Từ->đến trang: .;Năm: 2013
Lĩnh vực: Kỹ thuật; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
Concrete has been considered to be a useful material in radioactive waste repository concepts. Thus, the assessment of the service life of cement-based structures for radioactive waste facilities is of great importance. The service life of these structures is directly related to the time necessary for the wastes radioactivity to reach its natural level, which typically exceeds hundreds of years. It is necessary, therefore, to explain how concrete will be degraded, and what properties it will show over hundreds of years after placing. The objective of this research is to conduct a phenomenological study of the relationship between chemical degradation and transport properties of cementitious materials at cm3-dm3 scale. Processes influencing concrete degradation, solute transport behaviour during saturated and steady flow conditions of undegraded/degraded concrete are investigated. Despite advances in this area, a significant amount of work is still warranted due to limited experimental timeframe available to capture these processes. An improved understanding of these relations via microstructural changes would help to better assess the long-term durability of cement-based materials subjected to chemical degradation.
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ABSTRACT
Concrete has been considered to be a useful material in radioactive waste repository concepts. Thus, the assessment of the service life of cement-based structures for radioactive waste facilities is of great importance. The service life of these structures is directly related to the time necessary for the wastes radioactivity to reach its natural level, which typically exceeds hundreds of years. It is necessary, therefore, to explain how concrete will be degraded, and what properties it will show over hundreds of years after placing. The objective of this research is to conduct a phenomenological study of the relationship between chemical degradation and transport properties of cementitious materials at cm3-dm3 scale. Processes influencing concrete degradation, solute transport behaviour during saturated and steady flow conditions of undegraded/degraded concrete are investigated. Despite advances in this area, a significant amount of work is still warranted due to limited experimental timeframe available to capture these processes. An improved understanding of these relations via microstructural changes would help to better assess the long-term durability of cement-based materials subjected to chemical degradation.
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