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Open AccessArticle

Effective Bio-Slime Coating Technique for Concrete Surfaces under Sulfate Attack

1
Department of Plant Architectural Engineering, Kyonggi University, Suwon 16227, Korea
2
Department of Civil Engineering, Hannam University, 70 Hannam-ro, Daedeok-gu, Daejeon 34430, Korea
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1512; https://doi.org/10.3390/ma13071512 (registering DOI)
Received: 27 February 2020 / Revised: 12 March 2020 / Accepted: 23 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue High Performance Concrete)
The service life of concretes exposed to sulfate decreases as the concrete body expands due to the formation of gypsum and ettringite. Bacteria-based repair coating layers, which have been studied lately, are aerobic and very effective on the sulfate attack. In this study, bio-slime repair coating layers were fabricated using bacteria, and chloride diffusion experiments were performed. In addition, the service life of concrete under sulfate attack was evaluated using time-dependent diffusivity and a multi-layer technique. Chloride diffusivity was compared with sulfate diffusivity based on literature review, and the results were used to consider the reduction in the diffusion coefficient. In the analysis results, the service life of concrete was evaluated to be 38.5 years without bio-slime coating layer, but it was increased to 41.5–54.3 years using it. In addition, when the thickness of the bio-slime coating layer is 2.0 mm, the service life can be increased by 1.31–2.15 times if the sulfate diffusion coefficient of the layer is controlled at a level of 0.1 ~ 0.3 × 10−12 m2/s. Eco-friendly and aerobic bio-slime coating layers are expected to effectively resist sulfate under appropriate construction conditions. View Full-Text
Keywords: bio-slime; sulfate attack; chloride attack; service life; multi-layer diffusion; repair bio-slime; sulfate attack; chloride attack; service life; multi-layer diffusion; repair
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MDPI and ACS Style

Yang, K.-H.; Lim, H.-S.; Kwon, S.-J. Effective Bio-Slime Coating Technique for Concrete Surfaces under Sulfate Attack. Materials 2020, 13, 1512.

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