Meso-scale Modeling of Anomalous Moisture Transport in Concrete Considering Microstructural Change of Cement-based Material

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-06-19 DOI:10.3151/jact.22.344
Puttipong Srimook, Keigo Ogawa, Ippei Maruyama
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Abstract

Moisture transport is the key phenomenon indicating the deterioration of the durability and structural performance of concrete structures. Although various studies have attempted to evaluate moisture transport in concrete, an anomalous behavior, which does not follow the root-t law compared to other porous material, was not explicitly taken into account. To quantitatively evaluate anomalous moisture transport, this study developed a couple of numerical methods between the truss-network model (TNM) and the rigid-body-spring model (RBSM) for this purpose. The colloidal behavior of calcium-silicate-hydrate (C-S-H), which is the major phase of cement-based material, was introduced to consider the anomalous behavior and mechanical response regarding the microstructural change of cement paste as well as cracks that significantly accelerate the moisture transport in concrete. The numerical results indicated that both microstructural change of cement paste and rapid absorption through cracks cause anomalous behavior. In addition, the numerical results suggest that volumetric change of cement paste should rely on water content related to the colloidal behavior of C-S-H in order to reproduce the realistic expansion and the closure of cracks during a rewetting process that affects structural performance and durability of concrete.

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考虑水泥基材料微观结构变化的混凝土中异常水分迁移中尺度模型
水分迁移是表明混凝土结构耐久性和结构性能恶化的关键现象。尽管各种研究都试图评估混凝土中的水分迁移,但与其他多孔材料相比,混凝土中的水分迁移不遵循根-t 规律,这种反常行为并未被明确考虑在内。为了定量评估反常水分传输,本研究在桁架网络模型(TNM)和刚体弹簧模型(RBSM)之间开发了几种数值方法。研究引入了水泥基材料的主要相硅酸钙水合物(C-S-H)的胶体行为,以考虑水泥浆微观结构变化的异常行为和力学响应,以及显著加速混凝土中水分迁移的裂缝。数值结果表明,水泥浆的微观结构变化和裂缝的快速吸收都会导致异常行为。此外,数值结果表明,水泥浆体的体积变化应依赖于与 C-S-H 胶体行为相关的含水量,以便再现影响混凝土结构性能和耐久性的再湿润过程中裂缝的真实扩展和闭合。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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