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Title |
Evaluation of Sulfuric Acid Resistance of Biomimetic Coating Mortars for Concrete Surface Protection
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Authors |
윤현섭(Hyun-sub Yoon) ; 양근혁(Keun-hyeok Yang) ; 이상섭(Sang-seob Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.1.061 |
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Keywords |
생태학적 코팅재 ; 박테리아 ; 글라이코 캘릭스 ; 내황산성 biomimetic coating materials ; bacteria ; glycocalyx ; sulfuric acid resistance |
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Abstract |
The objective of this study is to evaluate the sulfuric acid resistance of biomimetic coating mortars based on glycocalyx substance generated around the bacteria cell to protect the substrate of concrete. Rhodobacter capsulatus was isolated as a bacteria strain, and expanded vermiculate or super absorbent polymer, employed for immobilizing the bacteria, were used at 30 % volume for replacement of fine aggregates in coating mortars. The coating mortars using expanded vermiculate containing bacterial agents exhibited better performance than the other mortars with respect to the following: the 28-day compressive strength and population of viable bacteria were 40.7 MPa and 4.6×106 cell/mL, respectively; the variations of compressive strength and mass measured in specimens immersed in 5 % sulfuric acid solution were less than 2 %; and the gypsum production due to the hydrate chemical action against sulfuric acid was 17 % lower than that of the mortar without bacteria. As a result, the proposed biomimetic coating mortars have great potential as protective materials for blocking deterioration of concrete.
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