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Title |
Evaluation of Mechanical Characteristics and CO2 Capture Performance of Carbon-Neutrality Mortars Using Biochar and Bacteria
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Authors |
이규찬(Gyu-Chan Lee) ; 황지원(Ji-Won Hwang) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.3.335 |
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Keywords |
CO2 포집; 탄소중립; 모르타르; 바이오차; 박테리아 CO2 capture; carbon-neutrality; mortar; biochar; bacteria |
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Abstract |
We investigated the fundamental performance of a composite carbon-neutral mortar that combines physical carbon adsorption by biochar with biological carbon sequestration by photosynthetic bacteria. Rhodopseudomonas palustris, which captures CO2 via the Calvin cycle, was selected as the biological agent and immobilized in porous expanded vermiculite. The immobilized bacteria were incorporated by replacing 0~20 % of the fine aggregate volume. Biochar produced by pyrolysis of livestock manure at temperatures above 650 °C was used as a partial cement replacement at levels ranging from 0 to 20 % by mass. The experimental results indicate that the compressive strength development, stress-strain behavior, and splitting tensile strength of the carbon-neutral mortar are comparable to those of conventional mortar. In contrast, the CO2 capture capacity of the carbon-neutral mortar was up to 2.4 times higher at 91 days, with the performance enhancement becoming more pronounced over time. Overall, the proposed carbon-neutral mortar shows strong potential as a sustainable construction material capable of continuous CO2 capture under ambient environmental conditions.
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