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Pre-bio-carbonation method for using reactive MgO for rapid pavement repair and the carbonation mechanisms.

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Title: Pre-bio-carbonation method for using reactive MgO for rapid pavement repair and the carbonation mechanisms.
Authors: Cui, Hui-Yue1,2 (AUTHOR), Hoang, Tung3 (AUTHOR), Chu, Jian2 (AUTHOR) CJCHU@ntu.edu.sg, Dong, Zhi-Li4 (AUTHOR), Lam, Kok-Pang5 (AUTHOR)
Source: Acta Geotechnica. Jul2024, Vol. 19 Issue 7, p4519-4531. 13p.
Subjects: Pavement maintenance & repair, Carbonation (Chemistry), Granular materials, Road maintenance, Strength of materials
Abstract: For road repair, a rapid method is much desired to minimize traffic disclosure. This study proposes a new method for granular materials to gain strength rapidly. Using microbial carbonation for reactive MgO cement (RMC), a pre-bio-carbonation method is proposed to allow RMC treated materials to gain 80% of the final strength in 2 h when 8% RMC content is used. In this proposed method, a biosolution that has been premixed several hours before application is applied together with RMC for soil treatment. The carbonates that have already been generated from a urea hydrolyzation using ureolytic bacteria allow an immediate carbonation of RMC. As a result, the strength of the bio-carbonated RMC treated materials gain strength rapidly due to a quick formation and crystallinity of hydrated magnesium carbonates. To study the mechanisms and effectiveness of this method, laboratory tests were carried out to evaluate the strength development with time in the RMC treated granular materials and the conditions controlling the amount of strength gain. The influence of biosolution mixing time on the strength gain and the microstructural development of the bio-carbonated RMC are also discussed. [ABSTRACT FROM AUTHOR]
Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Pre-bio-carbonation method for using reactive MgO for rapid pavement repair and the carbonation mechanisms.
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  Data: <searchLink fieldCode="DE" term="%22Pavement+maintenance+%26+repair%22">Pavement maintenance & repair</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonation+%28Chemistry%29%22">Carbonation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Granular+materials%22">Granular materials</searchLink><br /><searchLink fieldCode="DE" term="%22Road+maintenance%22">Road maintenance</searchLink><br /><searchLink fieldCode="DE" term="%22Strength+of+materials%22">Strength of materials</searchLink>
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  Data: For road repair, a rapid method is much desired to minimize traffic disclosure. This study proposes a new method for granular materials to gain strength rapidly. Using microbial carbonation for reactive MgO cement (RMC), a pre-bio-carbonation method is proposed to allow RMC treated materials to gain 80% of the final strength in 2 h when 8% RMC content is used. In this proposed method, a biosolution that has been premixed several hours before application is applied together with RMC for soil treatment. The carbonates that have already been generated from a urea hydrolyzation using ureolytic bacteria allow an immediate carbonation of RMC. As a result, the strength of the bio-carbonated RMC treated materials gain strength rapidly due to a quick formation and crystallinity of hydrated magnesium carbonates. To study the mechanisms and effectiveness of this method, laboratory tests were carried out to evaluate the strength development with time in the RMC treated granular materials and the conditions controlling the amount of strength gain. The influence of biosolution mixing time on the strength gain and the microstructural development of the bio-carbonated RMC are also discussed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Jul2024
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