Review on carbonation study of reinforcement concrete incorporating with bacteria as self-healing approach
This study carried out a comprehensive review to determine the carbonation process that causes the most deterioration and destruction of concrete. The carbonation mechanism involved using carbon dioxide (CO2 ) to penetrate the concrete pore system into the atmosphere and reduce the alkalinity by...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI
2022
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7687/1/J14721_2cb30b041b6d76aeaa7f32ed1563fd5d.pdf http://eprints.uthm.edu.my/7687/ https://doi.org/ 10.3390/ma15165543 |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English |
| Summary: | This study carried out a comprehensive review to determine the carbonation process that
causes the most deterioration and destruction of concrete. The carbonation mechanism involved
using carbon dioxide (CO2
) to penetrate the concrete pore system into the atmosphere and reduce the
alkalinity by decreasing the pH level around the reinforcement and initiation of the corrosion process.
The use of bacteria in the concrete was to increase the pH of the concrete by producing urease enzyme.
This technique may help to maintain concrete alkalinity in high levels, even when the carbonation
process occurs, because the CO2 accelerates to the concrete and then converts directly to calcium
carbonate, CaCO3
. Consequently, the self-healing of the cracks and the pores occurred as a result of
the carbonation process and bacteria enzyme reaction. As a result of these reactions, the concrete steel
is protected, and the concrete properties and durability may improve. However, there are several
factors that control carbonation which have been grouped into internal and external factors. Many
studies on carbonation have been carried out to explore the effect of bacteria to improve durability
and concrete strength. However, an in-depth literature review revealed that the use of bacteria as a
self-healing mechanism can still be improved upon. This review aimed to highlight and discuss the
possibility of applying bacteria in concrete to improve reinforcement concrete. |
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