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Title |
Evaluation of Carbonation and Freeze-Thaw Resistance in Biomimetic Mortars with Halophilic Bacteria
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Authors |
황지원(Ji-Won Hwang) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.6.575 |
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Keywords |
생태 모르타르; 호염 박테리아; 탄산화; 동결융해; 내구성 지수 biomimetic coating materials; halophilic bacteria; carbonation; freezing-thawing; durability factor |
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Abstract |
This study examined the carbonation and freeze-thawing resistances of biomimetic mortars incorporating Bacillus licheniformis and Halomonas venusta as halophilic strains. These bacteria were immobilized in expanded vermiculite under a negative pressure environment. Fine aggregates were then replaced by expanded vermiculites at volumes of 10 % and 30 %. Test results showed that the depth of carbonation in biomimetic mortars with 10 % and 30 % expanded vermiculite was 15~30 % and 30~38 % lower than that of the control mortar, respectively. These biomimetic mortars also exhibited durability indices 1.3~1.5 and 1.1~1.6 times higher, respectively, when compared with the control mortar, in freeze-thaw tests conducted for up to 300 cycles. Even after 300 freeze-thaw cycles, viable cell populations in biomimetic mortars remained at over 1×104 cell/mL.
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