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<p>The growing demand for sustainable construction has increased interest in using recycled concrete aggregates (RCA) in concrete production. Existing studies have focused on the mechanical and durability properties of recycled aggregate concrete (RAC), but the applicability of standard durability tests to RAC remains insufficiently examined. The electrical resistivity (ER) test provides a rapid and practical assessment of concrete durability. Previous studies have shown a strong correlation between ER and chloride migration, making ER a reliable indicator of concrete’s resistance to chloride ion penetration. However, this relationship may not apply to RAC. This study evaluates the performance of RAC with and without amorphous rice husk ash (RHA) by examining electrical resistivity and non-steady-state migration coefficients to assess the applicability of ER in durability evaluation of RAC. The RHA was derived from an abundant agricultural waste in the Philippines. Concrete mixes were prepared with 0% and 10% RHA as cement replacement and with RCA replacing up to 100% of the coarse aggregate. The use of RCA decreased ER due to the higher porosity of the old mortar, whereas high RCA replacement reduced the non-steady-state migration coefficient, possibly due to chloride binding within the adhered mortar. Incorporating RHA improved both resistivity and chloride resistance through pozzolanic reaction and pore refinement. Unlike in conventional concrete, a weak correlation was observed between ER and chloride migration, suggesting that ER alone is not a reliable predictor of chloride ingress in RAC. The findings emphasize the need for direct migration testing for accurate durability assessment of RAC.</p>

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Electrical resistivity and chloride penetrability of concrete with recycled concrete aggregate and rice husk ash

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月19日

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  • Marian Apple Verbo,
  • Isabela Gwynette Dela Peña,
  • Marish Madlangbayan,
  • Justine Anne Mendoza,
  • Harvey Maunahan,
  • Ariel Miguel Aragoncillo

摘要

The growing demand for sustainable construction has increased interest in using recycled concrete aggregates (RCA) in concrete production. Existing studies have focused on the mechanical and durability properties of recycled aggregate concrete (RAC), but the applicability of standard durability tests to RAC remains insufficiently examined. The electrical resistivity (ER) test provides a rapid and practical assessment of concrete durability. Previous studies have shown a strong correlation between ER and chloride migration, making ER a reliable indicator of concrete’s resistance to chloride ion penetration. However, this relationship may not apply to RAC. This study evaluates the performance of RAC with and without amorphous rice husk ash (RHA) by examining electrical resistivity and non-steady-state migration coefficients to assess the applicability of ER in durability evaluation of RAC. The RHA was derived from an abundant agricultural waste in the Philippines. Concrete mixes were prepared with 0% and 10% RHA as cement replacement and with RCA replacing up to 100% of the coarse aggregate. The use of RCA decreased ER due to the higher porosity of the old mortar, whereas high RCA replacement reduced the non-steady-state migration coefficient, possibly due to chloride binding within the adhered mortar. Incorporating RHA improved both resistivity and chloride resistance through pozzolanic reaction and pore refinement. Unlike in conventional concrete, a weak correlation was observed between ER and chloride migration, suggesting that ER alone is not a reliable predictor of chloride ingress in RAC. The findings emphasize the need for direct migration testing for accurate durability assessment of RAC.