Van Der Bergh, JM, Miljević, B, Vučetić, S, Šovljanski, O, Markov, S, Riley, ML, Ranogajec, J and Brás, A (2021) Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure. SUSTAINABILITY, 13 (8).

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Abstract

Reinforced concrete crack repair and maintenance costs are around 84% to 125% higher than construction costs, which emphasises the need to increase the infrastructure service life. Prolongation of the designed service life of concrete structures can have significant economic and ecological benefits by minimising the maintenance actions and related increase of carbon and energy expenditure, making it more sustainable. Different mechanisms such as diffusion, permeation and capillary action are responsible for the transport of fluids inside the concrete, which can impact on the structure service life. This paper presents data on microbially induced repair and self-healing solutions for cementitious materials available in the contemporary literature and compares results of compressive strength test and capillary water absorption test, which are relevant to their sealing and mechanical characteristics. The results of the repair and self-healing solutions (relative to unassisted recovery processes) were “normalized.” Externally applied bacteria-based solutions can improve the compressive strength of cementitious materials from 13% to 27%. The internal solution based solely on bacterial suspension had 19% improvement efficacy. Results also show that “hybrid” solutions, based on both bio-based and non-bio-based components, whether externally or internally applied, have the potential for best repair results, synergistically combining their benefits.

Item Type:	Article
Uncontrolled Keywords:	Science & Technology; Life Sciences & Biomedicine; Green & Sustainable Science & Technology; Environmental Sciences; Environmental Studies; Science & Technology - Other Topics; Environmental Sciences & Ecology; self-healing; MICP; concrete repair; external healing; service life; crack repair; compressive strength recovery improvement; capillary water absorption reduction; CONCRETE; PRECIPITATION; MORTAR; PERFORMANCE; BACTERIA; CONSOLIDATION; CAPACITY; STONE; 12 Built Environment and Design
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Divisions:	Civil Engineering & Built Environment
Publisher:	MDPI
SWORD Depositor:	A Symplectic
Date Deposited:	13 Oct 2022 10:37
Last Modified:	13 Oct 2022 10:45
DOI or ID number:	10.3390/su13084287
URI:	https://researchonline.ljmu.ac.uk/id/eprint/17829

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