광물질 혼화재를 혼합한 콘크리트의 칼슘용출 저항 특성
Characteristics of Calcium Leaching Resistance for Concrete Mixed with Mineral Admixture
1
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
콘크리트는 유해물질을 봉함처리하기 위한 매우 유용한 건설재료이다. 일반적으로 이러한 시설물에는 매스콘크리트가 적용되며, 장기간 성능이 요구되므로 광물질 혼화재를 사용하는 것이 바람직하다. 지하구조물에서는 순수와의 접촉으로 칼슘용출이 발생할 수 있으므로 광물질 혼화재를 포함하고 있는 콘크리트의 칼슘용출 저항성을 평가할 필요가 있다. 실험결과에 따르면, 광물질 혼화재는 콘크리트 부재의 장기압축강도 및 염화물 확산계수 개선에 효과적이지만, 칼슘용출이 발생하면 압축강도 및 염화물 확산 저항성 저하가 OPC에 비해 심하고, 미세공극분포도 영향을 받는다. 따라서 칼슘용출환경에 노출되는 지하구조물에 광물질 혼화재가 적용될 경우에는, 물-결합재비를 저감시키며, 충분한 포졸란 반응 이후에 노출해야 하고, FA 보다는 BFS를 사용하는 것이 바람직하다.
Abstract
Concrete is a very useful construction material for the sealing disposal of hazardous substances. In general, mass concrete is applied to these structures. And, the mineral admixtures are recommended for the long term performance. Calcium leaching could be happened due to the contact with pure water in underground structures. Thus, it is needed to evaluate the resistance of calcium leaching for concrete mixed with mineral admixtures. From the test results, the mineral admixtures are effective to the improvement of long term compressive strength and chloride diffusion coefficient in concrete members. When calcium leaching is happened, however, the reduction of compressive strength and chloride penetration resistance is severe than OPC case, the micro pore distribution is adversely affected. Consequently, when the mineral admixtures are applied to underground structures which is exposed to calcium leaching environment, it is desirable to reduce water-to-binder ratio, to expose after the sufficient pozolanic reaction, and to use BFS than FA.
참고문헌 (19)
- "ASTM D 4284, Standard Test Method for Determining Pore Volume Distribution of Catalysts by Mercury Intrusion Porosimetry", 2007~ (2007)
- 배주성, "전기적인 촉진시험에 의한 콘크리트의 염화물이온 확산특성", 한국구조물진단유지관리공학회 논문집, 14(3), pp.138~143 (2010), 한국구조물진단유지관리공학회
- Carde, C., "Use of Ammonium Nitrate Solution to Simulate and Accelerate the Leaching of Cement Pastes due to Deionized Water", Magazine of Concrete Research, 49(181), pp.295~301 (1997)
- 최윤석, "칼슘 용출 열화에 의해 표면이 손상된 콘크리트 부재의 구조적 거동에 관한 해석적 연구", 한국구조물진단유지관리공학회 논문집, 18(4), pp.22~32 (2014), 한국구조물진단유지관리공학회[DOI]
- Choi, Y. S., "Effect of Calcium Leaching on the Pore Structure, Strength, and Chloride Penetration Resistance in Concrete Specimens", Nuclear Engineering and Design, 237, pp.126~136 (2013)
- Haga, K., "Effect of Porosity on Leaching of Ca from Hardened Ordinary Portland Cement Paste", Cement and Concrete Research, 35(9), pp.1764~1775 (2005)
- Hauyan, M., "Freezing–thawing Durability and its Improvement of High Strength Shrinkage Compensation Concrete with High Volume Mineral Admixtures", Construction and Building Materials, 39, pp.124~128 (2013)
- Kari, O. P., "Simulation of Concrete Deterioration in Finnish Rock Cavern Conditions for Final Disposal of Nuclear Waste", Annals of Nuclear Energy, 72, pp.20~30 (2014)
- Kim, J. Y., "Gas Threshold Pressure and Gas Permeability of Silo Concrete Specimens for a low-and Intermediate-Level Waste Disposal Facility in Korea", Annals of Nuclear Energy, 55, pp.1~8 (2013)
- Kim, Y. K., "A Study on the Methodology to Ensure Long-Term Durability of Low and Intermediate Level Radwaste Disposal Concrete Structure", Proceedings of the Korean Radioactive Waste Society Conference The Korean Radioactive Waste Society, pp.212~220 (2005)
- 민정욱, "메타카올린 및 실리카퓸의 혼입이 고강도 콘크리트의 압축강도와 염소이온 투과에 미치는 영향에 관한 통계적 가설검증", 한국구조물진단유지관리공학회 논문집, 15(1), pp.215~225 (2011), 한국구조물진단유지관리공학회
- Saito, H., "Leaching Tests on Different Mortars Using Accelerated Electrochemical Method", Cement and Concrete Research, 30(11), pp.1815~1825 (2000)
- Sheen, J. J., "A Study on the Radiation Shielding Analysis for LILW Vitrification Facility", Department of Nuclear Engineering, pp.2002
- Skoczylas, F., "Experimental Study of Accelerated Leaching on Hollw Cylinders of Mortar", Cement and Concrete Research, 37(1), pp.71~78 (2007)
- Tang, L., "Rapid Determination of the Chloride Diffusivity in Concrete by Applying an Electrical Field", ACI Material Journal, 89(1), pp.49~53 (1992)
- Torrenti, J. M., "Chemo-Mechanical Coupling Behaviour of Leached Concrete PartI: Experimental Results", Nuclear Engineering and Design, 237, pp.2083~2089 (2007)
- Turick, C. E., "Review of Concrete Biodeterioration in Relation to Nuclear Waste", Journal of Environmental Radioactivity, 151, pp.12~21 (2016)
- 양은익, "초기 휨균열이 철근콘크리트 부재의 염화물침투저항성에 미치는 영향", 한국구조물진단유지관리공학회 논문집, 15(2), pp.79~87 (2011), 한국구조물진단유지관리공학회
- 양은익, "칼슘이 용출된 콘크리트의 공극 구조 및 강도 특성", 콘크리트학회 논문집, 23(5), pp.647~656 (2011), 한국콘크리트학회