Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials

Mohammad Fahimizadeh , Pooria Pasbakhsh , Lee Sui Mae , Joash Ban Lee Tan , R.K. Singh Raman

Engineering ›› 2022, Vol. 13 ›› Issue (6) : 217 -237.

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Engineering ›› 2022, Vol. 13 ›› Issue (6) : 217 -237. DOI: 10.1016/j.eng.2021.11.016
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Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials

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Abstract

Microbially induced calcium carbonate (CaCO3) precipitation (MICP) has been investigated as a sustainable alternative to conventional concrete remediation methods for improving the mechanical properties and durability of concrete structures. To date, urea-dependent MICP is the most widely employed MICP pathway in biological self-healing concrete research as its use has resulted in efficient CaCO3 precipitation rates. NH3 is a byproduct of ureolysis, and can be hazardous to cementitious structures and the health of various species. Accordingly, non-ureolytic bacterial concrete self-healing systems have been developed as eco-friendly alternatives to urea-dependent self-healing systems. Non-ureolytic pathways can improve the physical properties of concrete samples and incorporate the use of waste materials; they have the potential to be cost-effective and sustainable. Moreover, they can be applied in terrestrial and marine environments. To date, research on non-ureolytic concrete self-healing systems has been scarce compared to that on ureolytic systems. This article discusses the advances and challenges in non-ureolytic bacterial concrete self-healing studies and highlights the directions for future research.

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Self-healing concrete / Mechanical properties / Durability / Non-ureolytic pathways / Cement composite / Sustainability

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Mohammad Fahimizadeh, Pooria Pasbakhsh, Lee Sui Mae, Joash Ban Lee Tan, R.K. Singh Raman. Multifunctional, Sustainable, and Biological Non-Ureolytic Self-Healing Systems for Cement-Based Materials. Engineering, 2022, 13(6): 217-237 DOI:10.1016/j.eng.2021.11.016

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