균열 패턴에 따른 균열부 콘크리트의 염화물 확산계수 모델링
Modeling on Chloride Diffusion Coefficient in Cracked Concrete Considering Crack Pattern
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초록
콘크리트에 균열이 발생하면 공극이외에 균열을 통한 추가적인 염화물 이온의 유입이 발생하므로 철근부식이 가속화된다. 본 연구는 균열을 가진 콘크리트의 염화물 확산에 대한 모델링으로, 대표체적을 가정하여 1차원 (이방성) 및 2차원 (등방성) 균열 패턴 모델링을 수행하였다. 기존의 모델링에서는 정상상태를 가정하여 직사각형 균열패턴으로 모델링을 수행하였으나, 본 연구에서는 삼각형 쐐기형 패턴으로 균열부 모델링을 수행하였다. 기존의 실험결과와 비교할 때 균열패턴을 쐐기형으로 고려하여, 균열폭이 5, 9, 12μm로 진전함에 따라 121.6%, 179.8%, 153.6%의 오차에서 10.8%, 39.9%, 26.8%로 정확도가 크게 개선됨을 알 수 있다.
Abstract
When concrete has cracks on surface, steel corrosion is accelerated due to additional intrusion of chloride ion through crack width besides capillary pores. This paper proposes a modeling on chloride diffusion in cracked concrete, and 1-D (anisotropic) and 2-D (isotropic) modeling on chloride diffusion coefficients are performed assuming steady state condition. In the previous study, rectangular shape of crack was proposed, however in this paper wedge shape of crack is considered. Compared with the previous test results, the proposed models are verified to be more accurate showing decreased relative errors from 121.6%, 179.8%, and 153.6% to 10.8%, 39.9%, and 26.8% with increasing crack width to 5μm, 9μm, and 12μm, respectively.
참고문헌 (18)
- Ishida, T., "Modeling of PH Profile in Pore Water Based on Mass Transport and Chemical Equilibrium Theory", Concrete Library of JSCE, 37(1), pp.151~166 (2001)
- 신언교, "2현시입체교차로 설계기법 개발 및 평가에 관한 연구", 대한토목학회 논문집D, 25(2D), pp.213~220 (2005), 대한토목학회
- Thomas M.D.A., "Modeling Chloride Diffusion in Concrete: Effect of Fly Ash and Slag", Cement and Concrete Research, 29(4), pp.487~495 (1999)
- Park, S.S, "Modeling of Water Permeability in Early Aged Concrete with Cracks based on Micro Pore Structure", Construction and Building Materials, 27(1), pp.597~604 (2012)
- Park, S.S., "Analysis Technique for Chloride Penetration in Cracked Concrete using Equivalent Diffusion and Permeation", Construction and Building Materials, 29(2), pp.183~192 (2012)
- Kwon, S.-J., "Service Life Prediction of Concrete Wharves with Early-Aged Crack : Probabilistic Approach for Chloride Diffusion", Structural Safety, 31(1), pp.75~83 (2009)
- Gerard, B, "Influence of Cracking on the Diffusion Properties of Cement-Based Materials Part I: Influence of Continuous Cracks on the Steady-State Regime", Cement and Concrete Research, 30(2), pp.37~43
- Song, H.-W., "Prediction of Service Life in Cracked Reinforced Concrete Structures Subjected to Chloride Attack and Carbonation", 6th International Congress Global Construction: Ultimate Concrete Opportunities, Dundee, pp.767~776 (2005)
- Song, H.-W, "Service Life Prediction of Concrete Structures under Marine Environment Considering Coupled Deterioration", J. of Restoration of Buildings and Monuments, 12(4), pp.265~284 (2006)
- 박상순, "초기재령에서 균열을 갖는 콘크리트의 염화물 침투 해석", 대한토목학회논문집, 21(6-B), pp.925~924 (2001)
- Song, H.-W., "Predicting Carbonation in Early-Aged Cracked Concrete", Cement and Concrete Research, 36(5), pp.979~989 (2006)
- 권성준, "실태조사를 통한 항만 콘크리트 구조물의 균열부 확산계수 추정에 대한 연구", 대한토목학회 논문집A, 27(5A), pp.745~752 (2007), 대한토목학회
- Yokozeki, K., "Prediction of The Service Life of RC with Crack Exposed to Chloride Attack", Japan Symposium of Rehabilitation of Concrete Structure, 10(1), pp.1~6 (1998)
- Win, P.P., "Penetration Profile of Chloride Ion in Cracked Reinforced Concrete", Cement and Concrete Research, 34(2), pp.1073~1079 (2004)
- Maekawa, K., "Multi-Scale Modeling of Structural Performance", pp.322~325 (2009), Taylor & Francis
- 한국콘크리트학회, "콘크리트 표준시방서–내구성편", 24~38 (2004)
- JSCE - Concrete Committee, "Standard Specification for Concrete Structures", 42~78 (2002)
- Jacobsen, S, "Effect of Cracking and Healing on Chloride transport in OPC Concrete", Cement and Concrete Research, 26(6), pp.869~881 (1996)