| 일제시대 건설된 해양 콘크리트구조물의 물성 평가(영도대교) |
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박동천, 안재철 |
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| The Property Evaluation of the Marine Concrete Structure Constructed in the Period of Japanese Occupancy (YoungDo Bridge) |
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Dong-Cheon. Park, Jae-Cheol Ahn |
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| Abstract |
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YoungDo bridge is the first suspension bridge in Busan which experienced several times repair and reinforcement after completion in 1934. The bridge is under demolition for extension and restoration work since 2011. The purpose of this research is to establish data base about modern concrete. The mix design of the concrete is like that cement : fine aggregate : coarse aggregate = 1 : 2 : 4 or 1 : 3 : 6 by the parts. The compressive strength is in the ranges from 50 to 55 MPa and the elastic modulus is in the ranges from 25 to 35 GPa. From the fact that the deviation is less than 10 %, considerably high quality control was conducted in those days. The carbonation depth is 5.92 cm at the bridge post and 14.3 cm at the machine room. That is why ocean environment keeps the high humidity. The diffusion coefficient of chloride ion through the pores in concrete is 1.052e-12 m2/s from the regression analysis using the experiment data. The water cement ration is estimated at approximately 35 % in case if the concrete using ordinary Portland cement. |
| Key Words:
염소이온 확산계수
Youngdo bridge;mix design analysis;compressive strength;carbonation test;chloride ion diffusion coefficient |
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