연행 공기량이 해양콘크리트의 동결융해 및 염화물 확산특성에 미치는 영향
The Effect of Entrained Air Contents on the Properties of Freeze-thaw Deterioration and Chloride Migration in Marine Concrete
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The freeze-thaw deterioration and chloride attack, which are the typical degradation factors for durability of marine concrete, are significantly affected by pore structures in terms of penetration and diffusion. These pore structures of concrete are closely related to the types and amount of AE agent, used to guarantee the resistance of freeze-thaw deterioration, and the elapsed time before concrete pouring. This paper evaluates the durability of concrete based on the results of tests on cylinder specimens and core specimens from mock-up members with different air content of 4～6% and 8～10%, respectively. According to the test results, the air content of hardened concrete is 2.5～5.2% at 7 days and 2.4～5.1% at 28 days. These air contents are about half of the initial values just after the concrete mixing. Judging from the amount of scale after the freeze-thaw test completed, air content of 8～10% is slightly more beneficial against the deterioration of concrete than air content of 4～6%. Meanwhile, the core specimens from mock-up members exhibit somewhat unfavorable freeze-thaw deterioration and chloride migration characteristic compared with the cylinder specimens tested in the laboratory under the same mixing condition, as to show 106% in freeze-thaw test and 160% in chloride diffusion coefficient test, respectively.
Abstract
The freeze-thaw deterioration and chloride attack, which are the typical degradation factors for durability of marine concrete, are significantly affected by pore structures in terms of penetration and diffusion. These pore structures of concrete are closely related to the types and amount of AE agent, used to guarantee the resistance of freeze-thaw deterioration, and the elapsed time before concrete pouring. This paper evaluates the durability of concrete based on the results of tests on cylinder specimens and core specimens from mock-up members with different air content of 4～6% and 8～10%, respectively. According to the test results, the air content of hardened concrete is 2.5～5.2% at 7 days and 2.4～5.1% at 28 days. These air contents are about half of the initial values just after the concrete mixing. Judging from the amount of scale after the freeze-thaw test completed, air content of 8～10% is slightly more beneficial against the deterioration of concrete than air content of 4～6%. Meanwhile, the core specimens from mock-up members exhibit somewhat unfavorable freeze-thaw deterioration and chloride migration characteristic compared with the cylinder specimens tested in the laboratory under the same mixing condition, as to show 106% in freeze-thaw test and 160% in chloride diffusion coefficient test, respectively.
참고문헌 (5)
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- 박상준, "부산-거제간 연결도로 사업에 적용한 100년 내구수명 고내구성 콘크리트", 한국콘크리트학회지, 89, pp.62~71 (2005)
- Yoo, J. K., "Investigation of corrosion protection properties of concrete containing ground granulated blast-furnace slag for massive coastal concrete structures in Korea", International Conference Advances in Concrete and Structure 2003, 2, pp.818~826 (2004)
- Duracrete final technical report, , ~ (2000)
- NT Build 492, "Concrete, mortar and cementbased repair materials: chloride migration coefficient", NORDTEST, ~ (1999)