The influence of multi-strain combined microbial coating on the salt spray corrosion resistance of concrete

Dai, Jinpeng, Wang, Yan, Mu, Song, Wang, Yuliang, Qi, Yuhu and Liu, Tong 2026. The influence of multi-strain combined microbial coating on the salt spray corrosion resistance of concrete. Journal of Building Engineering 132 , 117428. 10.1016/j.jobe.2026.117428

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Abstract

The microbial-induced calcium carbonate precipitation (MICP) technology offers an eco-friendly method for safeguarding concrete. Nonetheless, the corrosion resistance mechanism and effectiveness of this technology remain ambiguous. In this investigation, a coating grounded on microbial mineralization was formulated, and its protective capabilities were scrutinized. By subjecting the consortium of Bacillus cohnii (K) and Sporosarcina pasteurii (B) to alkaline resistance acclimation and screening for carbon-calcium sources, a suitable combination was identified for the concrete's high alkalinity and salt fog conditions. A microbial coating utilizing sodium alginate/polyvinyl alcohol as the substrate, enhanced with a silane coupling agent and nano-Al2O3, was synthesized. The protective mechanism was elucidated through accelerated salt fog tests, microscopic analysis, and molecular dynamics simulations. The findings indicated that the K + B composite coating exhibited the best protective performance. The strains collaboratively facilitated the generation of a compact organic-inorganic protective film, efficiently obstructing the penetration of chloride ions and water molecules. Following 28 days of salt fog corrosion, the percentage of deleterious and highly deleterious pores decreased to 19.47%, Friedel salt formation reduced by 15.27%, compressive strength retention rate achieved 99.66%, and it could stabilize C-S-H and other hydration products. Atomic simulation revealed that its interface displayed strong adhesion and the lowest potential energy, enabling effective modulation of chloride ion transportation. This study introduces a novel concept and theoretical framework for environmentally friendly and durable concrete protection in salt fog conditions.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Publisher:	Elsevier
ISSN:	2352-7102
Date of Acceptance:	25 September 2026
Last Modified:	05 Oct 2026 09:30
URI:	https://orca.cardiff.ac.uk/id/eprint/189974

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