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Computers and Concrete Volume 23, Number 1, January 2019 , pages 069-80 DOI: https://doi.org/10.12989/cac.2019.23.1.069 |
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Numerical study of ITZ contribution on diffusion of chloride and induced rebar corrosion: A discussion of three-dimensional multiscale approach |
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Xi Tu, Cunjun Pang, Xuhong Zhou and Airong Chen
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| Abstract | ||
| Modeling approach for mesoscopic model of concrete depicting mass transportation and physicochemical reaction is important since there is growing demand for accuracy and computational efficiency of numerical simulation. Mesoscopic numerical simulation considering binder, aggregate and interfacial transition zone (ITZ) generally produces huge number of DOFs, which is inapplicable for full structure. In this paper, a three-dimensional multiscale approach describing three-phase structure of concrete was discussed numerically. An effective approach generating random aggregate in polygon based on checking centroid distance and intersection of line segment was introduced. Moreover, ITZ elements were built by parallel expanding the surface of aggregates on inner side. By combining mesoscopic model including full-graded aggregate and macroscopic model, cases related to diffusivity and thickness of ITZ, volume fraction and grade of aggregate were studied regarding the consideration of multiscale compensation. Result clearly showed that larger analysis model in multiscale model expanded the diffusion space of chloride ion and decreased chloride content in front of rebar. Finally, this paper addressed some worth-noting conclusions about the chloride distribution and rebar corrosion regarding the configuration of, rebar diameter, concrete cover and exposure period. | ||
| Key Words | ||
| reinforced concrete structure; chloride diffusion; numerical simulation; multiscale; ITZ | ||
| Address | ||
| Xi Tu, Cunjun Pang and Xuhong Zhou: Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing, China; College of Civil Engineering, Chongqing University, Chongqing, China Airong Chen: Department of Bridge Engineering, Tongji University, Shanghai, China | ||