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<p>This article investigates the influence of sintered lightweight concrete (SLWC) surface quality, carbonation, and acid resistance cast using controlled permeable formwork (CPF) liner. Carbonation and acid resistance of SLWC tend to be lower than those of normal weight aggregate concrete (NWC) owing to the higher porosity and lower density of sintered fly ash aggregate (SFA). The lower density SFA reaches towards the surface and causes non-uniform w/c ratio near the surfaces during compaction. CPF liner is an active technique that helps to enhance the properties of concrete in the cover region. In this study, image processing technique was used for studying the surface imperfections like bug holes, various tests including accelerated carbonation, acid resistance, dynamic acid resistance, sorptivity, water penetration were used for assessing surface quality and transport properties. The results showed that the SLWC surfaces cast against CPF liner revealed around a 90% reduction in bug holes, and improved performance in terms of carbonation, acid resistance, dynamic acid resistance, and water penetration by 97%, 48%, 8%, and 93%, respectively. Overall, CPF liner enhances the quality of SLWC surfaces by decreasing the bug hole ratio and improving the resistance to penetration of deteriorating agents.</p>

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Mitigating Surface Defects and Durability Challenges in Lightweight Fly Ash Concrete with CPF Liner

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • P. Gowdhamramkarthik,
  • G. Arun Kumar,
  • N. Shanmugasundaram,
  • K. Vedhasakthi

摘要

This article investigates the influence of sintered lightweight concrete (SLWC) surface quality, carbonation, and acid resistance cast using controlled permeable formwork (CPF) liner. Carbonation and acid resistance of SLWC tend to be lower than those of normal weight aggregate concrete (NWC) owing to the higher porosity and lower density of sintered fly ash aggregate (SFA). The lower density SFA reaches towards the surface and causes non-uniform w/c ratio near the surfaces during compaction. CPF liner is an active technique that helps to enhance the properties of concrete in the cover region. In this study, image processing technique was used for studying the surface imperfections like bug holes, various tests including accelerated carbonation, acid resistance, dynamic acid resistance, sorptivity, water penetration were used for assessing surface quality and transport properties. The results showed that the SLWC surfaces cast against CPF liner revealed around a 90% reduction in bug holes, and improved performance in terms of carbonation, acid resistance, dynamic acid resistance, and water penetration by 97%, 48%, 8%, and 93%, respectively. Overall, CPF liner enhances the quality of SLWC surfaces by decreasing the bug hole ratio and improving the resistance to penetration of deteriorating agents.