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<p>The widespread use of cement and river sand in making concrete leads to adverse environmental impacts, including resource depletion and damage to ecosystems. This research examines the impact of replacing a portion of cement with ground granulated blast furnace slag (GGBS) and sugarcane bagasse ash (SBA) in proportions varying from 10 to 30%. The research also investigates the replacement of river sand with fine recycled aggregate (FRA) in amounts between 10 and 50%. Various assessments were conducted, such as compressive strength test, Rapid Chloride Penetration Test (RCPT), sorptivity test, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM), to evaluate the modified concrete. The addition of FRA and SBA resulted in reduced workability of the concrete. However, replacing a portion of the cement with GGBS improved workability. The results showed that using FRA, SBA, and GGBS together enhances both compressive strength and durability. The control mix achieved compressive strengths of 41&#xa0;MPa at 28&#xa0;days and 42&#xa0;MPa at 56&#xa0;days. After 28&#xa0;days, the mixture with 30% FRA showed a strength enhancement of 4.88%, while the blend that included 30% FRA and 20% SBA exhibited a 9.76% strength increase. The mixture composed of 30% FRA, 20% SBA, and 20% GGBS achieved the highest enhancement, yielding a 14.63% increase in strength compared to the control mix. At 56&#xa0;days, the mixture with 30% FRA attained a 4.76% improvement, the mixture with 30% FRA and 20% SBA gained 9.52%, and the blend of 30% FRA, 20% SBA, and 20% GGBS achieved the largest enhancement at 15.48% compared to the control concrete. Incorporating 30% FRA in the concrete resulted in a 25.5% reduction in chloride penetration after 28&#xa0;days. The inclusion of 20% SBA raised this reduction to 38.4%, while adding 20% GGBS yielded the most substantial effect, leading to a 50.6% decrease. After 56&#xa0;days, the mixture with only 30% FRA exhibited a smaller reduction of 5.7%, but the mixtures with 30% FRA + 20% SBA and 30% FRA + 20% SBA + 20% GGBS maintained their effectiveness, resulting in reductions of 25.3 and 39.7%, respectively. The pozzolanic characteristics of SBA and GGBS contribute to compressive strength enhancements of up to 20%, whereas FRA can replace up to 30% of river sand, improving concrete porosity. Modified concrete showed better strength, durability and water absorption resistance making them best choice for application of eco-friendly pavements.</p>

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Performance characteristics of ternary blended concrete incorporating fine recycled aggregate, sugarcane bagasse ash and ground granulated blast furnace slag

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Kunchala Ashok,
  • Sk. M. Subhani,
  • Baranidharan Sundaram

摘要

The widespread use of cement and river sand in making concrete leads to adverse environmental impacts, including resource depletion and damage to ecosystems. This research examines the impact of replacing a portion of cement with ground granulated blast furnace slag (GGBS) and sugarcane bagasse ash (SBA) in proportions varying from 10 to 30%. The research also investigates the replacement of river sand with fine recycled aggregate (FRA) in amounts between 10 and 50%. Various assessments were conducted, such as compressive strength test, Rapid Chloride Penetration Test (RCPT), sorptivity test, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM), to evaluate the modified concrete. The addition of FRA and SBA resulted in reduced workability of the concrete. However, replacing a portion of the cement with GGBS improved workability. The results showed that using FRA, SBA, and GGBS together enhances both compressive strength and durability. The control mix achieved compressive strengths of 41 MPa at 28 days and 42 MPa at 56 days. After 28 days, the mixture with 30% FRA showed a strength enhancement of 4.88%, while the blend that included 30% FRA and 20% SBA exhibited a 9.76% strength increase. The mixture composed of 30% FRA, 20% SBA, and 20% GGBS achieved the highest enhancement, yielding a 14.63% increase in strength compared to the control mix. At 56 days, the mixture with 30% FRA attained a 4.76% improvement, the mixture with 30% FRA and 20% SBA gained 9.52%, and the blend of 30% FRA, 20% SBA, and 20% GGBS achieved the largest enhancement at 15.48% compared to the control concrete. Incorporating 30% FRA in the concrete resulted in a 25.5% reduction in chloride penetration after 28 days. The inclusion of 20% SBA raised this reduction to 38.4%, while adding 20% GGBS yielded the most substantial effect, leading to a 50.6% decrease. After 56 days, the mixture with only 30% FRA exhibited a smaller reduction of 5.7%, but the mixtures with 30% FRA + 20% SBA and 30% FRA + 20% SBA + 20% GGBS maintained their effectiveness, resulting in reductions of 25.3 and 39.7%, respectively. The pozzolanic characteristics of SBA and GGBS contribute to compressive strength enhancements of up to 20%, whereas FRA can replace up to 30% of river sand, improving concrete porosity. Modified concrete showed better strength, durability and water absorption resistance making them best choice for application of eco-friendly pavements.