利用水化动力学对混凝土干燥收缩进行介观模拟

IF 7.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Mechanical Sciences Pub Date : 2024-09-11 DOI:10.1016/j.ijmecsci.2024.109716
Mengxi Zhang , Wenwei Li , Mingchao Li , Qiaoling Min , Yang Shen , Chensen Ding
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引用次数: 0

摘要

收缩引起的开裂严重影响大体积混凝土结构的耐久性。由于实验耗时且水化过程中的微观结构变化容易被忽视,因此定量评估混凝土的干燥收缩具有挑战性。为了解决这一问题,本研究通过微观结构实验初步确定了低热硅酸盐水泥(LHPC)的长期水化产物和微观结构。随后,开发了一种新型高分辨率中尺度框架,用于研究干燥收缩与水化动力学。高分辨率模型由形状逼真的骨料组成,并通过大体积混凝土芯样的骨料形态和级配参数进行验证。同时,还探讨了内部和外部因素对 LHPC 干燥收缩的定量影响。结果表明,与中热硅酸盐水泥相比,LHPC 具有更致密的微观结构、更低的孔隙率、更高的抗碳化能力以及 20% 的干燥收缩率,应用前景广阔。此外,实验和计算结果表明,增加骨料体积、控制骨料形态以及调整养护时间和湿度可减少和控制干燥收缩,从而确保混凝土结构的耐久性。
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Mesoscopic simulation of concrete drying shrinkage with hydration kinetics

Shrinkage-induced cracking significantly impacts the durability of mass concrete structures. Quantitatively evaluating drying shrinkage of concrete proves challenging due to the time-consuming experiments and overlooked microstructure changes during the hydration process. To address this concern, this study initially characterized the long-term hydration products and microstructure of low-heat Portland cement (LHPC) through microstructural experiments. Subsequently, a novel high-resolution mesoscale framework is developed to investigate the drying shrinkage with hydration kinetics. High-resolution models consist of realistic-shaped aggregates are validated by the aggregate morphology and gradation parameters of core sample from mass concrete. Concurrently, the quantitative effects of internal and external factors on LHPC drying shrinkage are explored. Results indicated that LHPC possesses a denser microstructure, lower porosity, higher carbonation resistance, and 20% lower drying shrinkage compared to moderate-heat Portland cement, suggesting promising applications. Furthermore, experimental and computational findings suggested that increasing aggregate volume, controlling aggregate morphology, and adjusting curing time and humidity could be employed to reduce and manage drying shrinkage, ensuring concrete structure durability.

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来源期刊
International Journal of Mechanical Sciences
International Journal of Mechanical Sciences 工程技术-工程:机械
CiteScore
12.80
自引率
17.80%
发文量
769
审稿时长
19 days
期刊介绍: The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.
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