Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Experimental Study on Evaluation on Volume Stability of the Electric Arc Furnace Oxidizing Slag Aggregate

전기로 산화슬래그 골재의 체적안정성 평가에 관한 실험적 연구

  • 임희섭 (한양대학교 건축시스템공학과) ;
  • 이한승 (한양대학교 ERICA 건축학부)
  • Received : 2016.11.15
  • Accepted : 2017.02.15
  • Published : 2017.03.01
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Abstract

As the amount of slag generated annually increases, attempts to recycle slag as high value products are underway in order to develop an efficient resource recycling industry based on slag and derive economic benefits as well. However, the application of electric arc furnace (EOS) slag as construction material is practically limited because of the unstable substances included in it, such as free CaO.(EOS contains a small amount of free CaO, but several limitations still exist. Slag is stored for more than 3 months depending on the quantity of slag, which leads to additional economic loss. In this study, the amount of free CaO present in EOS is quantitatively evaluated to examine its qualities as a potential construction material and verify its application as concrete material. The quantitative analysis of free CaO present in EOS is performed using ethylene glycol. The free CaO contents of EOS samples were found to be below 0.5%. This satisfies the criteria specified in KS F 4571, which states that the CaO content should be below 40% and $CaO/SiO_2$ ratio should be below 2.0. In addition, it was confirmed that free CaO content difference appears to be dependent on the aging period and storage position.

본 논문은 전기로 산화슬래그 골재의 체적안정성 평가를 위해 전기로 산화슬래그 골재의 물리적 화학적 특성을 검토하고, 전기로 산화슬래그 골재의 체적안정성 실험을 진행하였다. 체적안정성을 검토하기 위하여 물리적 화학적 방법을 고안하여 실험을 진행하였다. 물리적 방법으로는 오토클레이브의 고온 고압을 이용하여 전기로 산화슬래그 골재의 체가름 변화를 확인하는 방법과 모르타르바를 제작하여 길이변화율에 따른 체적팽창성을 확인하였다. 화학적 방법으로는 Ethylene glycol 시험법을 이용하여 전기로 산화슬래그 골재의 free CaO 함량을 정량 평가하였다. 전기로 산화슬래그 골재의 free CaO 정량 평가 결과 0.5% 이하의 함량으로 나타났으며, 화학 분석 결과 KS F 4571의 CaO 40%이하로 확인 되었다. 전기로 산화슬래그의 free CaO가 소량 함유됨에 따라 건설재료로서의 가능성을 확인하였다.

Keywords

References

  1. Chalasani, D., Cartlendge, F. K., Eaton, H. C., Tittlebau, M. E., and Walsh, M. B. (1986), The Effects of Ethylene Glycol on a Cement Based Solidification Process. Journal of Hazardous Materials, 3, 167-173.
  2. Faraone, N., Tonello, G., and Maschio, S. (2009), Steelmaking Slag as Aggregate for Mortars: Effects of Particle Dimension on Compression Strength, Chemophere, 77, 1152-1156. https://doi.org/10.1016/j.chemosphere.2009.08.002
  3. Fernandez Pereira, C., Luna Galiano, Y., Rodriguez Pinero, M. A., and Bale Parapar, J. (2007), Long and Short-term Performance of a Stabilized/solidified Electric Arc Furnace Dust, Journal of Hazardous Materials, 148, 701-707. https://doi.org/10.1016/j.jhazmat.2007.03.034
  4. Javellana, M. P., and Jawed, I. (1982), Extraction of Free Lime in Portland Cement and Clinker by Ethylene Glycol. Cement and Concrete Research, 12, 399-403. https://doi.org/10.1016/0008-8846(82)90088-6
  5. Kim, J. M., Park, H. I. (2012), Evaluation on Volume Stability of the Electric Arc Furnace Oxidizing Slag Aggregate by Hydro Thermal Condition, Journal of Material Cycles and Waste Management, 29, 551-560.
  6. KS E 3019, Methods for Determination of Calcium Oxide in Iron Ores.
  7. KS F 2424, Standard Test Method for Length Change of Mortar and Concrete.
  8. KS F 2501, Method of Sampling Aggregate.
  9. KS F 2502, Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates.
  10. KS F 2503, Testing Method for Density and Absorption of Coarse Aggregate.
  11. KS F 2504, Testing Method for Density and Absorption of Fine Aggregate.
  12. KS F 2543, Copper Slag Aggregate for Concrete.
  13. KS F 2544, Blast Furnace Slag Aggregate for Concrete.
  14. KS F 2546, Standard Test Method of for Potential Alkali Reactivity of Cement-aggregate Combinations(Mortar-bar Method).
  15. KS F 2553, Method for Samples of Aggregated to Testing Size.
  16. KS F 2580, Test Method of the Inmersion Expansion in $80^{\circ}C$ Water of the Iron and Steel Slag.
  17. KS F 2583, Lead Slag Aggregate for Concrete.
  18. KS F 2585, Standard Test Method for Alkali-silica Reaction of Concrete.
  19. KS F 2586, Standard Test Method for Autogenous Shrinkage and Expansion of Cement Paste, Mortar and Concrete.
  20. KS F 2790, Ferronickel Slag Fine Aggregate for Concrete.
  21. KS F 2825, Methods of Rapid Test for Identification of the Alkali Reactivity of Aggregates-Methods of Test for Production Control of Concrete.
  22. KS F 4571, Electric Arc Furnace Oxidizing Slag Aggregate for Concrete.
  23. KS L 2308, Method for Chemical Analysis of Soda-lime-magnesia-silica Glasses.
  24. KS L 5107, Testing Method for Autoclave Expansion of Portland Cement.
  25. KS L 5120, Method of Chemical Analysis of Portland Cement.
  26. Kuo, W. T., and Shu, C. Y. (2014), Application of High-temperature Rapid Catalytic Technology to Forecast the Volumetric Stability Behavior of Containing Steel Slag Mixtures, Construction and Building Materials, 50, 463-470. https://doi.org/10.1016/j.conbuildmat.2013.09.030
  27. Lim H. S., and Lee H. S. (2013), An Experimental Study on the Free-CaO Quantitative Analysis in Electric Arc Furnace Slag Using Ethylene Glycol, Korea institute for structural maintenance and inspection, 17(2), 388-389.
  28. Onoue, K., Tokitsu, M., Ohtsu, M., and Bier, T. A. (2014), Fatigue Characteristics of Steel-making Slag Concrete Under Compression in Submerged Condition, Construction and Building Materials, 70, 231-242. https://doi.org/10.1016/j.conbuildmat.2014.07.107
  29. Sheen, Y. D., Le, D. H., and Sun, T. H. (2015), Innovative Usages of Stainless Steel Slags in Developing Self-compacting Concrete, Construction and Building Materials, 101, 268-276. https://doi.org/10.1016/j.conbuildmat.2015.10.079
  30. Sturm, T., Milacic, R., Murko, S., Vahcic, M., Mladenovic, A., Suput, J. S., and Scancar, J. (2009), The Use of EAF Dust in Cement Composites: Assessment of environmental impact, Journal of Hazardous Materials, 166, 277-283. https://doi.org/10.1016/j.jhazmat.2008.11.015
  31. Wamg, G. (2010), Determination of the Expansion Force of Coarse Steel Slag Aggregate, Construction and Building Materials, 24, 1961-1966. https://doi.org/10.1016/j.conbuildmat.2010.04.004