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Expansion strain model and damage risk control for cement-based materials with low water-binder ratios under rehydration

机译：水泥基材料的膨胀应变模型及损伤风险控制低水 - 粘合剂比再水解

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摘要

Unhydrated cementitious materials in cement-based materials with low water & ndash;binder ratios undergo rehydration after re-exposure to water. Long-term rehydration not only damages cement-based materials but also influences their volume stability; however, the relationship between macroscopic strength and expansion strain remains unclear. In this study, rehydration tests were conducted on cement paste to analyse the influence of water soaking temperature and water & ndash;cement ratio on the expansion strain of specimens, and an expansion strain model was established based on a hyperbolic model form. The methods of assessment and control of damage risk induced by long-term rehydration for cement-based materials were developed on the basis of the established model and the correlation between compressive strength and expansion strain. Results showed that the expansion strain of the cement paste specimen increases with increasing water soaking temperature but decreases with increasing water & ndash;cement ratio. The values predicted by the model were in good agreement with the experimental results. The control effect for the damage risk caused by rehydration became more significant as the amount of silica fume increased. It provides experimental and theoretical bases for the application and life-cycle design of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC) structures over long service periods in water environments. (c) 2021 Elsevier Ltd. All rights reserved.
机译：在水泥基材料中用低水分和Ndash的无水水解材料;在再暴露水后，粘合剂比率在水中进行再水化。长期补液不仅损害了基于水泥的材料，而且影响其体积稳定性;然而，宏观强度和膨胀应变之间的关系仍然不清楚。在该研究中，对水泥浆料进行再水化试验，以分析水浸泡温度和水和腹水的影响;基于双曲模型形式建立了膨胀应变模型的水泥比。基于建立的模型和抗压强度与膨胀应变之间的相关性，开发了通过长期补液诱导的基于水泥基材料诱导的损伤风险的方法。结果表明，水泥浆料试样的膨胀应变随着水浸泡温度的增加而增加，但随着水和Ndash的增加而降低;水泥比。模型预测的值与实验结果吻合良好。随着二氧化硅烟气量增加的，通过再水化引起的损伤风险的控制效果变得更加重要。它为高性能混凝土（HPC）和超高性能混凝土（UHPC）结构的应用和生命周期设计提供了实验和理论基础，在水环境中长期使用寿命周期。 （c）2021 elestvier有限公司保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2021年第14期|122996.1-122996.10|共10页
  • 作者

    Liu Yazhou; An Mingzhe; Zhang Ge; Yu Ziruo; Wang Yue; Han Song;

  • 作者单位

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China;

    Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R 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

    Rehydration; Expansion strain model; Low water?binder ratio; Damage risk;

    机译：补液;膨胀应变模型;低水？粘合剂比例;损伤风险;

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