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<p>The construction industry significantly contributes to global GDP and is growing alongside the increasing population. However, the industry is also a major concern for sustainability due to its substantial CO<sub>2</sub> emissions, primarily from cement production. This issue has gained considerable attention from the research community. One approach to mitigating the problem is using supplementary cementitious materials in concrete. The major aim of this research is to conduct a sustainability assessment of blended mixes along with evaluating their basic material properties. In this study, ordinary Portland cement (OPC) is partially replaced with metakaolin (MK) and sugarcane bagasse ash (SCBA) at varying percentages of 5%, 10%, and 15%. The results indicate that concrete made with MK and SCBA blends increases compressive strength at 7 and 28 days, with 10% being the optimal replacement percentage by weight of cement. However, the workability of the concrete is affected by all the partial cement replacement materials used in this study. Water absorption is reduced with the addition of MK and SCBA, whereas SCBA alone shows the opposite trend. The sustainability assessment of the mixes demonstrated that concrete made with MK, and SCBA individually and in combination has lower embodied carbon.</p>

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Effect of local metakaolin and waste sugarcane bagasse ash on mechanical properties and embodied carbon of sustainable concrete

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Aneel Kumar,
  • Rabinder Kumar,
  • Naraindas Bheel,
  • Sabir Ali,
  • Farhan Ahmed Shaikh,
  • Abdul Mannan Yousfani,
  • Samar Hussain Rizvi

摘要

The construction industry significantly contributes to global GDP and is growing alongside the increasing population. However, the industry is also a major concern for sustainability due to its substantial CO2 emissions, primarily from cement production. This issue has gained considerable attention from the research community. One approach to mitigating the problem is using supplementary cementitious materials in concrete. The major aim of this research is to conduct a sustainability assessment of blended mixes along with evaluating their basic material properties. In this study, ordinary Portland cement (OPC) is partially replaced with metakaolin (MK) and sugarcane bagasse ash (SCBA) at varying percentages of 5%, 10%, and 15%. The results indicate that concrete made with MK and SCBA blends increases compressive strength at 7 and 28 days, with 10% being the optimal replacement percentage by weight of cement. However, the workability of the concrete is affected by all the partial cement replacement materials used in this study. Water absorption is reduced with the addition of MK and SCBA, whereas SCBA alone shows the opposite trend. The sustainability assessment of the mixes demonstrated that concrete made with MK, and SCBA individually and in combination has lower embodied carbon.