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<p>Recycled concrete aggregate (RCA) has had increased recognition as a sustainable substitute to the natural aggregates used in the civil construction industry. RCA has inherent constraints as discussed before that include, but are not limited to, an increase in the porosity of RCA, an increase in the density of microcracks, and a decrease in bonding strength. This paper has examined the capacity for chemical treatment to modify RCA compositionally to improve the properties of RCA. This study has presented findings on the microstructural implications of RCA that arise as a result of chemical treatment, and how this will affect the mechanical and environmental performance of RCA with a thorough examination using Scanning Electron Microscopy (SEM). SEM findings presented substantial improvements in chemically altered RCA on the basis of surface roughness, porosity, microcrack removal, and particle bonding. These changes result in a more homogeneous material that has enhanced resistance to a number of external environmental conditions such as freeze-thaw cycles and moisture ingress. The present work likewise, discusses the role that calcium silicate hydrate (C-S-H) gel contributes to the strength gain of treated RCA which potentially recognizes it as a suitable material for high-performance concrete applications. Beyond the technical benefits, chemically treated RCA is consistent with sustainable construction by providing an environmentally viable option that does not require the same reliance on virgin resources that also minimizes construction waste. The findings suggest that the construction industry can be transformed by taking advantage of treated RCA to offer a durable material that is environmentally friendly. This research advances our knowledge on chemically processed RCA, and provides a road map for the large-scale potential use of chemically processed RCA in infrastructure construction. This work was presented to contribute to the on-going research and development of stronger and healthier structural building materials as a way to mitigate the microstructural limitations of RCA. Porosity, Average Pore Size, Microcrack Density, Surface Roughness (Texture), Water Absorption Potential are reduced by 10 to 40% when chemically treated. Whereas, Particle Bonding Strength and Freeze-Thaw Resistance are increased by more than 30%.</p>

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A comprehensive study of chemical treatment effects on recycled concrete aggregates

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Bhaskar Wabhitkar,
  • Sushilkumar Magade,
  • Mousim Sultan,
  • Rohit Wankhede,
  • Masooma Sultan,
  • Vishwadeep Ambhore,
  • Arti Dharpale

摘要

Recycled concrete aggregate (RCA) has had increased recognition as a sustainable substitute to the natural aggregates used in the civil construction industry. RCA has inherent constraints as discussed before that include, but are not limited to, an increase in the porosity of RCA, an increase in the density of microcracks, and a decrease in bonding strength. This paper has examined the capacity for chemical treatment to modify RCA compositionally to improve the properties of RCA. This study has presented findings on the microstructural implications of RCA that arise as a result of chemical treatment, and how this will affect the mechanical and environmental performance of RCA with a thorough examination using Scanning Electron Microscopy (SEM). SEM findings presented substantial improvements in chemically altered RCA on the basis of surface roughness, porosity, microcrack removal, and particle bonding. These changes result in a more homogeneous material that has enhanced resistance to a number of external environmental conditions such as freeze-thaw cycles and moisture ingress. The present work likewise, discusses the role that calcium silicate hydrate (C-S-H) gel contributes to the strength gain of treated RCA which potentially recognizes it as a suitable material for high-performance concrete applications. Beyond the technical benefits, chemically treated RCA is consistent with sustainable construction by providing an environmentally viable option that does not require the same reliance on virgin resources that also minimizes construction waste. The findings suggest that the construction industry can be transformed by taking advantage of treated RCA to offer a durable material that is environmentally friendly. This research advances our knowledge on chemically processed RCA, and provides a road map for the large-scale potential use of chemically processed RCA in infrastructure construction. This work was presented to contribute to the on-going research and development of stronger and healthier structural building materials as a way to mitigate the microstructural limitations of RCA. Porosity, Average Pore Size, Microcrack Density, Surface Roughness (Texture), Water Absorption Potential are reduced by 10 to 40% when chemically treated. Whereas, Particle Bonding Strength and Freeze-Thaw Resistance are increased by more than 30%.