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Towards a clean environment: The potential application of eco-friendly magnesia-silicate cement in CO2 sequestration
- Abdel-Gawwad, Hamdy A., Hassan, Hassan Soltan, Vásquez-García, S.R., Israde-Alcántara, Isabel, Ding, Yung-Chin, Martinez-Cinco, Marco Antonio, Abd El-Aleem, S., Khater, Hesham M., Tawfik, Taher A., El-Kattan, Ibrahim M.
- Journal of cleaner production 2020 v.252 pp. 119875
- X-ray diffraction, ambient temperature, carbon dioxide, carbon sequestration, cement, compression strength, global warming potential, magnesium hydroxide, magnesium oxide, mechanical properties, minerals, thermogravimetry, volcanic ash
- The key point of this study is the fabrication of magnesia-based cement with promising mechanical properties and high efficiency of CO₂-capture. The naturally occurring volcanic ashes (white & red ashes) and reactive magnesium oxide are the main materials used in the synthesis of eco-friendly CO₂-capture materials. Volcanic ashes were individually mixed with reactive magnesium oxide at ash to magnesium oxide ratio of 25:75 wt %. The dry blends can react with water to yield hardened materials (at ambient temperature) with compressive strength depends on the type of volcanic ash. A considerable change in the features of the hardened samples was recorded when the fabricated materials exposed to 100% CO₂ gas for 28-days. This change is mainly due to CO₂-capture by magnesium hydroxide Mg(OH)₂ within the fabricated materials, resulting in the formation of Nesquehonite minerals MgCO₃.3H₂O as proved by X-ray diffraction, thermo-gravimetric, and infra-red instrumental techniques. The thermo-gravimetric analysis demonstrates that, the fabricated sample containing low amorphous red ashes has higher CO₂-capture capacity (∼260 kg/ton) compared to that having high amorphous white volcanic ashes (∼220 kg/ton) at 28-days of CO₂-exposure. Accordingly, the fabricated magnesia-based cement is not only used as cementitious material with outstanding mechanical properties, but also used as a super CO₂-absorbent precursor. This can strongly contribute in the mitigation of global warming potential caused by different industrial activities.