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<p>The rapid growth of construction and demolition waste (CDW) in Vietnam has intensified interest in recycling materials such as recycled concrete aggregate (RCA) from CDW for roadbed applications. RCA offers high bearing capacity, while mixing with autoclaved aerated concrete (AAC) grains enhances the water retention, improving the cooling potential of permeable pavement systems (PPS), making these materials useful for urban heat island (UHI) mitigation. In practice, roadbed material is used in both well–graded and poorly– graded forms depending on the engineering requirements and site-specific conditions. Gas diffusivity (<i>D</i><sub>p</sub>/<i>D</i><sub>0</sub>) is a key parameter for evaluating coupled heat and moisture transfer, and thus the effectiveness of PPS in mitigating UHI impacts. This study, therefore, used well– and poorly–graded RCA and RCA–AAC mixtures to measure the <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> in the laboratory under a controlled main drying process. Then, the applicability of the excluded–volume expansion of Archie’s law for predicting <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> was examined. The results showed that the percolation threshold for well–graded mixtures generally exhibited lower values than poorly–graded ones, with average values of ~ 0.01 and ~ 0.04&#xa0;cm³/cm³, respectively. However, both well– and poorly– graded samples can be well predicted by using a unified model parameter of 0.7.</p>

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Excluded–volume expansion of Archie’s law for gas diffusivity in roadbed materials made from construction and demolition waste and their mixtures with autoclaved aerated concrete grains in Vietnam

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Van Nam Pham,
  • Akihiro Matsuno,
  • Takeshi Saito,
  • Hong Nam Thai,
  • Tien Dung Nguyen,
  • Hoang Giang Nguyen,
  • Ken Kawamoto

摘要

The rapid growth of construction and demolition waste (CDW) in Vietnam has intensified interest in recycling materials such as recycled concrete aggregate (RCA) from CDW for roadbed applications. RCA offers high bearing capacity, while mixing with autoclaved aerated concrete (AAC) grains enhances the water retention, improving the cooling potential of permeable pavement systems (PPS), making these materials useful for urban heat island (UHI) mitigation. In practice, roadbed material is used in both well–graded and poorly– graded forms depending on the engineering requirements and site-specific conditions. Gas diffusivity (Dp/D0) is a key parameter for evaluating coupled heat and moisture transfer, and thus the effectiveness of PPS in mitigating UHI impacts. This study, therefore, used well– and poorly–graded RCA and RCA–AAC mixtures to measure the Dp/D0 in the laboratory under a controlled main drying process. Then, the applicability of the excluded–volume expansion of Archie’s law for predicting Dp/D0 was examined. The results showed that the percolation threshold for well–graded mixtures generally exhibited lower values than poorly–graded ones, with average values of ~ 0.01 and ~ 0.04 cm³/cm³, respectively. However, both well– and poorly– graded samples can be well predicted by using a unified model parameter of 0.7.