콘크리트 압축강도와 염화물 확산의 상관성 평가에 대한 연구
Evaluation of Relationship between Compressive Strength and Chloride Diffusion
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초록
콘크리트 압축강도는 콘크리트의 구조적, 내구적 성능을 평가할 수 있는 대표적인 지표이다. 본 연구에는 재령 28일(표준), 270일(장기)의 압축강도를 이용하여 재령별 변화하는 촉진 염화물 확산계수 및 겉보기 염화물 확산계수와의 상관성을 평가하는 것이다. 이를 위해 3가지 물-결합재비를 가지는 7가지 콘크리트 배합이 준비되었으며, 혼화재료로서 고로슬래그미분말, 플라이애쉬가 사용되었다. 실험을 통하여 압축강도와 촉진/겉보기 염화물 확산계수가 분석되었으며, 압축강도를 이용하여 염화물 확산계수를 평가할 수 있는 비선형 회귀분석식을 제안하였다. 제안된 식은 실험값(촉진/겉보기 염화물 확산계수)과 신뢰할만한 상관성을 가지고 있으며, 염화물 해석에 사용될 수 있다고 판단된다.
Abstract
Compressive strength in concrete is a representative evaluation index for safety and durability performance. This paper is for evaluating a correlation between accelerated/apparent chloride diffusion coefficients which are time-dependant and compressive strength at the age of 28days(standard) and 270days(long term). For this work, seven mix cases with three different w/b(water to binder ratio) ratios for concrete are prepared. GGBFS(Ground Granulated Blast Furnace Slag) and FA(Fly Ash) are considered as mineral admixtures. Compressive strength and accelerated/apparent chloride diffusion coefficients are obtained and their correlations are investigated. Finally relationships between compressive strength and diffusion coefficients are derived through non-linear regression analysis. The suggested relationships with reasonable correlation can be used for chloride penetration evaluation.
참고문헌 (16)
- Broomfield J.P, "Corrosion of Steel in Concrete: Understanding, Investigation and Repair", pp.1~15 (1997), E&FN
- Durability Design of Concrete Structures, "RILEM", E&FN, 28~52, pp.Report of RILEM Technical Committee 130-CSL (1994)
- Thomas, M. D. A., "Computer Program for Predicting the Service Life and Life-Cycle Costs of Reinforced Concrete Exposed to Chlorides. Life365 Manual", SFA, 12~56 (2002)
- 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)
- JSCE-Concrete committee, "Standard Specification for Concrete Structures", 28~52 (2002)
- Korea Concrete Institute, "Concrete Standard Specification–Durability Part", 18~26 (2004)
- Ary, C., "Factors Influencing Chloride Binding in Concrete", Cement and Concrete Research, 20(2), pp.291~300 (1990)
- Tang, L., "Chloride Transport in Concrete, In Publication P-96:6. Division of Building Materials", pp.26~85 (1996), Chalmers University of Technology
- Maekawa, K., "Multi- Scale Modeling of Structural Concrete", pp.291~352 (2009), Tylor & Francis
- Song, H.-W., "A Study on Analytical Technique of Chloride Diffusion Considering Characteristics of Mixture Design for high Performance Concrete Using Mineral Admixture", Journal of KSCE, 25(1A), pp.213~223 (2005)
- "AASHTO T260-97, Standard Method of Test for Sampling and Testing for Chloride Ion in Concrete and Concrete Raw Materials", 2~8 (1997)
- Tang, L., "Electrically Accelerated Methods for Determining Chloride Diffusivity in Concrete- Current Development", Magazine of Concrete Research, 48(176), pp.173~179 (1996)
- Effect of Cement Types on the Durability of Concrete Structures, Technical Report, "Korea Highway Corporation", 129~133 (1999)
- Al-Amoudi, O.S.B., "Correlation between Compressive Strength and Certain Durability Indices of Plain and Blended Cement Concretes", Cement and Concrete Composites, 31, pp.672~676 (2009)
- 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)
- Lee, H.-S., "An Experimental Study on Carbonation Velocity in Cracked Concrete", Journal of the Construction and Environment Research Institute, 7(1), pp.1~11 (2012)