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 Chemical degradation of concrete with emphasis on Ca-leaching and carbonation
Tác giả hoặc Nhóm tác giả: Quoc Tri Phung, Norbert Maes
Nơi đăng: CEBAMA WP1 Experimental studies – State of the art literature review; Số: Deliverable D 1.03;Từ->đến trang: 119-132;Năm: 2016
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Many environments to which concrete is exposed are highly aggressive due to various chemical components. In such environments, concrete is subjected to processes of chemical degradation. Chemical degradation is typically the result of alteration of the cement matrix mineralogy caused by interacting with severe environment. The interaction disturbs the equilibrium between the pore solution and the solid phases of the cement matrix which results in dissolution and/or precipitation of minerals. The chemical degradation of cementitious materials is mostly followed by a weakening of the material and the alteration of the microstructure. Changes in the microstructure thereby affect the transport properties.
Depending on the roles of structures, the expected life span and the environments to which the concrete structures are exposed, different chemical degradation processes are considered. Carbonation and leaching are extremely slow processes but very important for long-term durability assessment and have been identified as the most important degradation mechanisms in waste disposal facilities. In this section, the consequences of exposure of cementitious materials to carbon dioxide and calcium leaching are reviewed.
ABSTRACT
Many environments to which concrete is exposed are highly aggressive due to various chemical components. In such environments, concrete is subjected to processes of chemical degradation. Chemical degradation is typically the result of alteration of the cement matrix mineralogy caused by interacting with severe environment. The interaction disturbs the equilibrium between the pore solution and the solid phases of the cement matrix which results in dissolution and/or precipitation of minerals. The chemical degradation of cementitious materials is mostly followed by a weakening of the material and the alteration of the microstructure. Changes in the microstructure thereby affect the transport properties.
Depending on the roles of structures, the expected life span and the environments to which the concrete structures are exposed, different chemical degradation processes are considered. Carbonation and leaching are extremely slow processes but very important for long-term durability assessment and have been identified as the most important degradation mechanisms in waste disposal facilities. In this section, the consequences of exposure of cementitious materials to carbon dioxide and calcium leaching are reviewed.
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