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A double-porosity model for water flow in unsaturated concrete

机译：非饱和混凝土中水流动的双孔隙模型

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摘要

This paper presents a double-porosity model for describing the moisture flow in unsaturated concrete. The two porosities used in the model represent the small pores of nano-scale and large pores of micro-scale, both of which are partially saturated with the moisture transport described by Darcy's law but with different transport properties. The model is applied to investigate the internal variation of saturation in a concrete in response to the change of humidity in the environment where the concrete is exposed. It is found that during wetting and drying cycles, the desaturation zone in concrete created in the first cycle expands continuously during the subsequent drying-wetting cycles. The wetting and drying cycles can push the desaturation zone from the surface layer into inner concrete gradually. This feature has not been explored in existing transport models.
机译：本文提出了一种双孔隙率模型，用于描述非饱和混凝土中的水分流。模型中使用的两个孔隙分别代表纳米级的小孔和微米级的大孔，它们都被达西定律描述的水分传输部分饱和，但具有不同的传输特性。该模型用于调查混凝土中饱和度的内部变化，以响应暴露于混凝土的环境中湿度的变化。发现在润湿和干燥循环期间，在第一循环中产生的混凝土中的去饱和区在随后的干燥-润湿循环中连续扩展。润湿和干燥循环可以将脱饱和区从表层逐渐推入内部混凝土。现有运输模型尚未探索此功能。

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  • 来源
    《Applied Mathematical Modelling》 |2018年第1期|510-522|共13页
  • 作者

    Dawang Li; Long-yuan Li; Xianfeng Wang; Feng Xing;

  • 作者单位

    Guangdong Provincial Key Laboratory of Durability for Maine Civil Engineering, Shenzhen University, Shenzhen 518060, PR China;

    School of Engineering, University of Plymouth, Plymouth PL4 8AA, UK;

    Guangdong Provincial Key Laboratory of Durability for Maine Civil Engineering, Shenzhen University, Shenzhen 518060, PR China;

    Guangdong Provincial Key Laboratory of Durability for Maine Civil Engineering, Shenzhen University, Shenzhen 518060, PR 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

    Double-porosity; Moisture flow; Unsaturated concrete; Wetting; Drying;

    机译：双孔;水分流不饱和混凝土;润湿;烘干;

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