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In this paper, the development law of micro-pore structure of recycled fine aggregate concrete under different fine aggregate replacement rates (0%, 30%, 50%, 70% and 100%) and curing ages (3d, 7d, 14d and 28d) is explored through experiments. The results show that the internal porosity of recycled concrete is inversely proportional to the replacement rate of recycled fine aggregate and curing age, and the porosity of RFA30 experimental group is the smallest. The average fractal dimensions corresponding to large, small and tiny pores in recycled concrete are 2.902, 2.926 and 0.938, respectively. With the increase of the replacement rate of recycled fine aggregate, the fractal dimension corresponding to the small pore part increases and the fractal dimension corresponding to the small pore part decreases; With the increase of age, the fractal dimensions of macropores and micropores decrease as a whole. The evolution process of microstructure of recycled fine aggregate concrete is revealed, which provides reference for subsequent research and practical application.

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Study on Pore Structure of Recycled Concrete Affected by Fine Aggregate Replacement Rate and Age

  • 会议论文

  • 发表日期：

    2025年

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  • Jun Feng,
  • Peijiang Cong,
  • Jie Zhang,
  • Hongqian Zhou,
  • Gaowei Liu,
  • Yanchun Li,
  • Guangyuan Xu,
  • Zibo Ji

摘要

In this paper, the development law of micro-pore structure of recycled fine aggregate concrete under different fine aggregate replacement rates (0%, 30%, 50%, 70% and 100%) and curing ages (3d, 7d, 14d and 28d) is explored through experiments. The results show that the internal porosity of recycled concrete is inversely proportional to the replacement rate of recycled fine aggregate and curing age, and the porosity of RFA30 experimental group is the smallest. The average fractal dimensions corresponding to large, small and tiny pores in recycled concrete are 2.902, 2.926 and 0.938, respectively. With the increase of the replacement rate of recycled fine aggregate, the fractal dimension corresponding to the small pore part increases and the fractal dimension corresponding to the small pore part decreases; With the increase of age, the fractal dimensions of macropores and micropores decrease as a whole. The evolution process of microstructure of recycled fine aggregate concrete is revealed, which provides reference for subsequent research and practical application.