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首页> 外文期刊>Magazine of Concrete Research >Moisture movement in early-age concrete under cement hydration and environmental drying
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Moisture movement in early-age concrete under cement hydration and environmental drying

机译：水泥水化和环境干燥下早龄混凝土的水分运动

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摘要

This paper focuses on improving the knowledge of moisture movement and simulation of concrete at early age. In the modelling, self-desiccation due to cement hydration and the non-linear moisture capacity of cementitious materials are considered. A model based on the degree of cement hydration is used to model the reduction in internal relative humidity due to cement hydration. A three-parameter model that is suited to a wide range of water-to-binder ratios of concrete is used to simulate moisture capacity. To verify the model, a series of tests to measure the internal relative humidity of three kinds of concrete under drying and sealing conditions is conducted. Through comparing the model and test results of humidity profiles, the moisture-dependent diffusivity of the three concretes is obtained. Owing to adequate consideration being given in the model to both moisture loss resulting from cement hydration and moisture capacity, the moisture diffusivity of the concrete obtained is less than that determined in previous investigations. The developed moisture movement model and finite-difference method can predict well the moisture distribution and its variations with time.
机译：本文着重于提高早期的水分运动和混凝土模拟的知识。在建模中，考虑了由于水泥水合作用引起的自干燥和水泥质材料的非线性湿容量。使用基于水泥水合度的模型来模拟由于水泥水合引起的内部相对湿度的降低。使用三参数模型来模拟混凝土的水容量，该模型适用于广泛的混凝土水灰比。为了验证该模型，进行了一系列测试，以测量三种混凝土在干燥和密封条件下的内部相对湿度。通过比较湿度分布图的模型和测试结果，得出了三种混凝土的水分依赖性扩散系数。由于在模型中充分考虑了水泥水化引起的水分损失和水分容量，因此所获得的混凝土的水分扩散率小于以前的研究结果。建立的水分运动模型和有限差分方法可以很好地预测水分的分布及其随时间的变化。

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  • 来源
    《Magazine of Concrete Research》 |2016年第8期|391-408|共18页
  • 作者

    Zhang Jun; Wang Jiahe; Gao Yuan;

  • 作者单位

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Safety & Durabil Struct Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Safety & Durabil Struct Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Safety & Durabil Struct Engn, Beijing 100084, 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
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