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Title |
Development of Bridge Deck Technology Using Bio-sulfur Concrete with Rapid-setting Cement
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Authors |
심명화(Myunghwa Shim) ; 박장춘(Jangchun Park) ; 이민택(Mintaek Lee) ; 권이금(Iegeum Kwon) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.4.309 |
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Keywords |
바이오 황, 황 콘크리트, 초속경 시멘트, 압축강도 bio-sulfur, sulfur concrete, rapid-set cement, compressive strength |
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Abstract |
Sulfur concrete has high strength properties due to its sulfur content, which is a byproduct of the crude oil refining process. In the Sudokwan landfill, bio-sulfur (SO3 93 %) is generated at a rate of about 20 tons a day as hydrogen sulfide from the landfill gas is oxidized by sulfur-oxidizing bacteria. This bio-sulfur, with a moisture content of about 50 %, was dehydrated using a filter press and subsequently dried in an oven. The water resistance of the bio-sulfur cement was ensured by mixing 10~15 % of dried bio-sulfur with rapid hardening cement. Calcium sulfate (CaSO4), formed from the sulfur in the bio-sulfur and the calcium in cement, effectively contributed to the compressive strength development. Bio-sulfur concrete has higher compressive strength, bond strength, and freeze?thaw resistance, as well as lower chloride penetration resistance and drying shrinkage, compared to conventional concrete. When the bio-sulfur rapid-set concrete (0.9 m3) was applied to a bridge (8.2 m2), it met the test standards for compressive strength, bond strength, chloride penetration resistance, and freeze?thaw resistance. After five months of testing, no cracks or breaks were observed. Similarly, when bio-sulfur rapid-set concrete (14.8 m3) was cast into a bridge for test construction, it satisfied the test standards for compressive strength, bond strength, chloride penetration resistance, and free-thaw resistance.
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