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 Resistance of concrete engineered barriers to Ca-leaching (best poster award)
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Tác giả hoặc Nhóm tác giả: Quoc Tri Phung, Norbert Maes, Diederik Jacques and Geert De Schutter
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Nơi đăng: Petrus conference, Nancy, France; Số: -;Từ->đến trang: 80-88;Năm: 2015
Lĩnh vực: Khoa học công nghệ; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
Concrete has been considered as a main constituent to be used for facilities with extremely long-term service life such as radioactive waste repositories. Therefore, the assessment of the long-term performance of such concrete structures is of utmost importance as they act as protective barrier by reducing the possibility of the spreading (transport of) the radioactive products out of the repository. Within its service environment, these structures undergo chemical degradation processes which are very slow but they significantly change the physical integrity (e.g. transport and mechanical properties) and the chemical condition (e.g. pH) of the structures in the long-term. Chemical degradation is typically the result of alteration of the cement matrix mineralogy caused by interaction with environmental conditions. The chemical degradation of cementitious materials is mostly followed by alteration of the microstructure and transport properties. The transport properties such as permeability and diffusivity are the key parameters to evaluate whether the concrete still retains its function as a barrier against the transport of radionuclides and other hazardous products out of the disposal system. Although a lot of effort has been spent on studies concerning the use of cement-based materials in such structures, the evolution of the microstructure and transport properties under chemical degradation over long time periods is still unclear due to the limited experimental timeframe available to capture these processes. This paper presents a comprehensive study of the consequences of exposure of cementitious materials to Ca-leaching from experiments to modelling.
ABSTRACT
Concrete has been considered as a main constituent to be used for facilities with extremely long-term service life such as radioactive waste repositories. Therefore, the assessment of the long-term performance of such concrete structures is of utmost importance as they act as protective barrier by reducing the possibility of the spreading (transport of) the radioactive products out of the repository. Within its service environment, these structures undergo chemical degradation processes which are very slow but they significantly change the physical integrity (e.g. transport and mechanical properties) and the chemical condition (e.g. pH) of the structures in the long-term. Chemical degradation is typically the result of alteration of the cement matrix mineralogy caused by interaction with environmental conditions. The chemical degradation of cementitious materials is mostly followed by alteration of the microstructure and transport properties. The transport properties such as permeability and diffusivity are the key parameters to evaluate whether the concrete still retains its function as a barrier against the transport of radionuclides and other hazardous products out of the disposal system. Although a lot of effort has been spent on studies concerning the use of cement-based materials in such structures, the evolution of the microstructure and transport properties under chemical degradation over long time periods is still unclear due to the limited experimental timeframe available to capture these processes. This paper presents a comprehensive study of the consequences of exposure of cementitious materials to Ca-leaching from experiments to modelling.
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