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In India, the construction industry annually generates millions of tons of debris, leading to increased landfill and environmental impact. To address this issue, recycling concrete waste has become imperative. This study investigates the improvement of recycled coarse aggregates (RCA) through surface treatments, specifically acid treatment using hydrochloric acid and silica fume slurry coating, to enhance their mechanical performance in concrete. Three types of aggregates—untreated (RA), acid-treated (ARA), and silica fume-treated (SFRA)—are incorporated into concrete specimens (cubes, cylinders, and beams) with varying replacement levels of natural coarse aggregate (0% to 100%). Preliminary tests on aggregates include water absorption, sieve analysis, specific gravity, impact value, crushing value, and abrasion resistance. The mechanical properties of the resulting concrete are evaluated through compressive, split tensile, and flexural strength tests to assess the effectiveness of the treatments.

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Experimental Investigation on Mechanical Properties of Recycled Aggregate Concrete with Surface Treatments

  • 会议论文

  • 发表日期：

    2025年

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  • D. Senthilvelan,
  • S. Vijayan,
  • P. Manibalan

摘要

In India, the construction industry annually generates millions of tons of debris, leading to increased landfill and environmental impact. To address this issue, recycling concrete waste has become imperative. This study investigates the improvement of recycled coarse aggregates (RCA) through surface treatments, specifically acid treatment using hydrochloric acid and silica fume slurry coating, to enhance their mechanical performance in concrete. Three types of aggregates—untreated (RA), acid-treated (ARA), and silica fume-treated (SFRA)—are incorporated into concrete specimens (cubes, cylinders, and beams) with varying replacement levels of natural coarse aggregate (0% to 100%). Preliminary tests on aggregates include water absorption, sieve analysis, specific gravity, impact value, crushing value, and abrasion resistance. The mechanical properties of the resulting concrete are evaluated through compressive, split tensile, and flexural strength tests to assess the effectiveness of the treatments.