| Autor: |
Srinivas M, Karthick, Alengaram, U. Johnson, Ibrahim, Shaliza, Vello, Vejeysri, Phang, Siew Moi |
| Předmět: |
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| Zdroj: |
Journal of Sustainable Cement-Based Materials; Jan2024, Vol. 13 Issue 1, p17-32, 16p |
| Abstrakt: |
As conventional concrete repairs have shortcomings and impact the environment, multiple attempts exist to find alternative sustainable measures to address this issue. Microbial-induced carbonate precipitation (MICP) using microalgae is one of the proven methods that can heal microcracks. In this study, the method used in repairing micro-cracks is by spraying microalgae species, namely, Arthrospira platensis and Synechococcus elongatus, cultured in a high calcium-based medium onto the surface of the cement mortar. The crack healing was evaluated for 14 days after the cracks were induced by applying 65–70% of the maximum threshold load. The results show that the microalgal-treated specimens exhibited a higher strength recovery, crack closure, and less water absorption than the control specimen. It is also observed that over 75–80% (0.26 mm, approx.) of the cracks can be healed within the span of 14 days sustainably using microalgae. This research investigated the healing capacity of cracked cement mortar by applying a microalgal solution on the surface externally. The study proves that microalgae are a better and more eco-friendly way than other external chemical agents to crack repair. A maximum of 67% strength was regained in 14 days of treatment with Arthrospira platensis. Over 75–80% of cracks can heal after spraying microalgae. Comparing SEM and XRD polymorphs, CaCO3 precipitation was identified as Vaterite and Calcite. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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