Microbially induced calcium carbonate(CaCO3)precipitation(MICP)has been investigated as a sustain-able 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 precipita-tion 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.

School of Engineering,Monash University Malaysia,Bandar Sunway 47500,Malaysia;School of Science,Monash University Malaysia,Bandar Sunway 47500,Malaysia;Tropical Medicine and Biology Multidisciplinary Platform,Monash University Malaysia,Bandar Sunway 47500,Malaysia;Department of Chemical Engineering&Department of Mechanical and Aerospace Engineering,Monash University,Clayton,VIC 3168,Australia

[1]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)[J].工程（英文）,2022(06):217-237

Ureolytic,ureolysis,ureolytic

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