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<p>Carbonating fillers and supplementary cementitious materials (SCMs) before their use in concrete offers a promising approach to sequester CO<sub>2</sub> without compromising the performance of SCM-blended cementitious systems. This study investigates the carbonation of fillers and SCMs with CaO + MgO content ranging from 16 to 50%. Preliminary experiments were conducted to determine the optimal conditions for CO<sub>2</sub> uptake, and all fillers/SCMs were exposed to CO<sub>2</sub> under these conditions. The effects of CO<sub>2</sub> exposure were evaluated using thermogravimetric analysis, Fourier transform infrared spectroscopy, and x-ray diffraction. The changes in material reactivity after carbonation were also tested using a modified R<sup>3</sup> test. Recycled cement materials and steel slags showed substantial CO<sub>2</sub> uptake. Otherwise, CO<sub>2</sub> uptake is generally low. CO<sub>2</sub> exposure has minimal impact on filler/SCM reactivity.</p>

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CO2 uptake in fillers and supplementary cementitious materials

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月5日

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  • Wasiu Olaniyi Alimi,
  • Prannoy Suraneni

摘要

Carbonating fillers and supplementary cementitious materials (SCMs) before their use in concrete offers a promising approach to sequester CO2 without compromising the performance of SCM-blended cementitious systems. This study investigates the carbonation of fillers and SCMs with CaO + MgO content ranging from 16 to 50%. Preliminary experiments were conducted to determine the optimal conditions for CO2 uptake, and all fillers/SCMs were exposed to CO2 under these conditions. The effects of CO2 exposure were evaluated using thermogravimetric analysis, Fourier transform infrared spectroscopy, and x-ray diffraction. The changes in material reactivity after carbonation were also tested using a modified R3 test. Recycled cement materials and steel slags showed substantial CO2 uptake. Otherwise, CO2 uptake is generally low. CO2 exposure has minimal impact on filler/SCM reactivity.