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Self-healing efficiency of unhydrated cement nuclei for dome-like crack mode in cementitious materials

机译：胶凝材料中非水合水泥核的拱形裂纹模式自愈效率

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摘要

Nuclei of cement particles left unhydrated in cementitious materials after maturation can provide self-healing capability to micro-cracked matrix under favorable conditions. In this present study under the assumption that self-healing is attributed to the rehydration of the unhydrated cement nuclei in cementitious materials, a model study is conducted to characterize the self-healing efficiency of the hydration reaction of unhydrated cement nuclei on crack. Based on a tortuous crack path around unhydrated cement nuclei in practical cementitious materials, a dome-like crack mode is presented to investigate the self-healing efficiency on cracks. Recurring to a generalized hydration reaction model of cement particles, the analytical self-healing efficiency model quantitatively considers the influence of the volume fraction and particle size distribution of unhydrated cement nuclei randomly distributed in cementitious materials based on the proposed domelike crack mode. Meanwhile, the healing process of unhydrated cement nuclei in model cementitious materials is simulated and the reliability of these analytical models is verified via computer simulation. Furthermore, model applications suggest that volume fraction of unhydrated cement nuclei in matrix is a key factor and the particle size distribution is also very important for self-healing efficiency in the long time.
机译：成熟后在胶凝材料中未水化的水泥颗粒核可在有利条件下为微裂纹基质提供自修复能力。在本研究中，在假设自修复归因于胶凝材料中未水合水泥核的再水化的前提下，进行了模型研究以表征未水合水泥核在裂纹上的水合反应的自愈效率。基于实际胶结材料中未水化水泥核周围的曲折裂纹路径，提出了一种圆顶状裂纹模式，以研究裂纹的自愈效率。归纳为水泥颗粒的广义水化反应模型，分析型自修复效率模型基于所提出的圆顶状裂纹模式，定量考虑了随机分布在胶凝材料中的未水合水泥核的体积分数和粒径分布的影响。同时，模拟了模型水泥材料中未水化水泥核的修复过程，并通过计算机仿真验证了这些分析模型的可靠性。此外，模型应用表明，基质中未水合水泥核的体积分数是关键因素，并且粒径分布对于长时间的自愈效率也非常重要。

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  • 来源
    《Materials and structures》 |2013年第11期|1881-1892|共12页
  • 作者

    Zhong Lv; Huisu Chen;

  • 作者单位

    Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;

    Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Self-healing; Unhydrated cement nuclei; Geometrical probability; Cracks; Computer simulation;

    机译：自我修复;未水合的水泥核;几何概率;裂缝;计算机模拟;

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