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<p>In recent decades, the building sector has increasingly prioritized the reduction of CO<sub>2</sub> emissions to mitigate global warming and climate change sustainably. Accelerated carbonation curing (ACC) presents a promising approach by enabling the sequestration of CO<sub>2</sub> in concrete and cement-based materials. This study investigates the influence of carbonation duration, fly ash content (0%, 10%, and 20%), and CO<sub>2</sub> concentration (10%, 15%, and 20%) on the accelerated carbonation process and the resulting concrete performance. To evaluate the effect of CO<sub>2</sub> concentration under different curing regimes, a combination of accelerated carbonation curing and air curing (AC) was employed with three curing schedules: (i) 4&#xa0;h ACC + 68&#xa0;h AC, (ii) 6&#xa0;h ACC + 66&#xa0;h AC, and (iii) 8&#xa0;h ACC + 64&#xa0;h AC. For comparison, control specimens (0% fly ash) were cured under both water curing and air curing for 72&#xa0;h. Compressive strength, carbonation depth, pH value, and percentage of permeable voids were tested for the performance of concrete subjected to ACC. CO<sub>2</sub> uptake was quantified through thermogravimetric analysis (TGA), while the chemical and microstructural changes induced by carbonation were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The findings demonstrate that accelerated carbonation curing significantly improves the mechanical and durability performance of concrete without compromising its alkalinity. This sustainable curing method holds particular promise for rapidly developing countries like India, offering a viable pathway to reduce CO<sub>2</sub> emissions from the construction industry while enhancing material performance.</p>

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Statistical design optimization and microstructural analysis of accelerated carbonation curing conditions for fly ash concrete

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Kishor S. Kulkarni,
  • Akarsh Padmalal,
  • Pradeep Rawat,
  • Rachit Agarwal

摘要

In recent decades, the building sector has increasingly prioritized the reduction of CO2 emissions to mitigate global warming and climate change sustainably. Accelerated carbonation curing (ACC) presents a promising approach by enabling the sequestration of CO2 in concrete and cement-based materials. This study investigates the influence of carbonation duration, fly ash content (0%, 10%, and 20%), and CO2 concentration (10%, 15%, and 20%) on the accelerated carbonation process and the resulting concrete performance. To evaluate the effect of CO2 concentration under different curing regimes, a combination of accelerated carbonation curing and air curing (AC) was employed with three curing schedules: (i) 4 h ACC + 68 h AC, (ii) 6 h ACC + 66 h AC, and (iii) 8 h ACC + 64 h AC. For comparison, control specimens (0% fly ash) were cured under both water curing and air curing for 72 h. Compressive strength, carbonation depth, pH value, and percentage of permeable voids were tested for the performance of concrete subjected to ACC. CO2 uptake was quantified through thermogravimetric analysis (TGA), while the chemical and microstructural changes induced by carbonation were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The findings demonstrate that accelerated carbonation curing significantly improves the mechanical and durability performance of concrete without compromising its alkalinity. This sustainable curing method holds particular promise for rapidly developing countries like India, offering a viable pathway to reduce CO2 emissions from the construction industry while enhancing material performance.