混凝土中水分扩散的中尺度建模创新方法

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Songsong Meng, Yifan Li, Iman Hajirasouliha, Giacomo Torelli, Maurizio Guadagnini, Kypros Pilakoutas
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引用次数: 0

摘要

湿气扩散会影响混凝土的耐久性和长期性能,虽然湿气扩散主要通过水泥基体和界面过渡区进行,但大多数现有模型都认为混凝土是均质的。本文介绍了一种采用随机堆积和 Voronoi 网格的新型微观渗透模型。结合 Rayleigh-Ritz 孔隙分布和 Brunauer-Skalny-Bodor 模型,确定了各种孔隙的半径和比例。结果表明,相对湿度(RH)随着温度的升高、环境相对湿度的降低和迂回度的增加而扩散得更快。与温度和迂回度相比,环境相对湿度对扩散的影响更大。数值和实验比较表明,所提出的方法能有效捕捉各种情况下的相对湿度分布。此外,显式孔隙网络建模包含了关键参数,可实现更精确的分析。将所提出的方法整合到完全耦合的湿力学框架中,有可能获得更准确的力学行为预测;提高长期性能评估的可靠性,并使混凝土设计更加耐用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An innovative method for mesoscale modelling of moisture diffusion in concrete
Moisture diffusion influences the durability and long-term performance of concrete and whilst it predominantly occurs via the cement matrix and Interfacial Transition Zone, most existing models consider concrete to be homogeneous. This paper introduces a novel micro-meso model that employs random packing and Voronoi tessellation. Rayleigh-Ritz pore distribution and Brunauer-Skalny-Bodor models are combined to determine the radius and fraction of various pores. The results indicate that relative humidity diffuses faster with increasing temperature, decreasing ambient relative humidity and tortuosity. Ambient relative humidity has a greater influence on diffusion compared to temperature and tortuosity. Numerical and experimental comparisons demonstrate that the proposed methodology effectively captures relative humidity distribution across various scenarios. Furthermore, explicit pore network modelling incorporates key parameters for a more accurate analysis. Integrating the proposed methodology into a fully coupled hygro-mechanical framework can potentially yield more accurate predictions of mechanical behaviour; enhancing the reliability of long-term performance assessments and enabling more durable concrete design.
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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