DOI QR코드

DOI QR Code

Study on Physical and Chemical Properties of CaO-Al2O3 System Melting Compound

CaO-Al2O3계 용융화합물의 물리·화학적 특성에 관한 연구

  • Received : 2012.10.29
  • Accepted : 2013.01.07
  • Published : 2013.04.30

Abstract

This study is aimed to identify the method to use the CaO-$Al_2O_3$ system of rapidly cooled steel making slag (RCSS) as the environment-friendly inorganic accelerating agent by analyzing its physical and chemical properties. The fraction of rapidly cooled steel making slag is distinguished from its fibrous, and the contents of CaO and $Fe_2O_3$ are inversely proportional across different fractions. In addition, as the content of CaO decreased and the content of $Fe_2O_3$ increased, the loss ignition tended to become negative (-) and the density increased. The pore distribution by mercury intrusion porosimetry is very low as compared to the slowly cooled steel-making slag, which indicates that the internal defect and the microspore rate are remarkably lowered by the rapid cooling. To analyze the major minerals the rapidly cooled steel-making slag, XRD, f-CaO quantification and SEM-EDAX analysis have been performed. The results shows that f-CaO does not exist, and the components are mainly consisted of $C_{12}A_7$ and reactive ${\beta}-C_2S$.

이 연구에서는 CaO-$Al_2O_3$계 급냉 제강슬래그(RCSS)의 물리 화학적 특성을 분석함으로써 친환경 무기 급결재로 활용방안을 모색하고자 하였다. RCSS의 성상은 섬유상과 구상으로 구별되었으며, 성상별로 CaO와 $Fe_2O_3$ 성분 함량이 반비례 경향을 나타냈다. 또한 CaO 함량이 낮아지고 $Fe_2O_3$ 함량이 증가함에 따라 강열감량은 (-)경향을 보였고 밀도는 증가하였다. 수은압입법에 의한 세공분포는 서냉 제강슬래그(SCSS)에 비해 매우 낮은 수치로 급냉에 의해 내부결함 및 미세기공률이 현저히 줄어든 것을 확인할 수 있었다. 급냉 제강슬래그를 구성하는 주요 광물을 분석하기 위해 XRD, f-CaO 정량, SEM-EDAX 분석을 실시한 결과에서 f-CaO의 존재는 관찰되지 않았으며, 구성성분이 주로 $C_{12}A_7$과 반응성 ${\beta}-C_2S$로 이루어져 있음을 확인할 수 있었다.

Keywords

References

  1. Moon, H. Y. and Yoo, J. H., "Utilization of Electric Arc Furnace Slag and Converter Slag after Aging for Concrete Aggregate," Journal of the Korea Concrete Institute, Vol. 14, No. 4, 2002, pp. 567-607. https://doi.org/10.4334/JKCI.2002.14.4.597
  2. Yoo, S. Y., Lee, K. J., Lee, S. L., Koo, J. S., and Kim, J. M., "A Fundamental Study on the Properties of CaO-$Al_{2}O_{3}$ Melt Blend according to Grinding Condition," Korea Recycled Construction Resource Institute, Vol. 12 No. 1, 2012, pp. 26-31.
  3. Kim, J. M., Kim, J. H., Lee, M. J., Choi, S. M., and Oh, S. Y., "Physical Characteristics of Rapidly Cooled Ladle Furnace Slag as Inorganic Binder," Korea Recycled Construction Resource Institute, Vol. 11, No. 2, 2011, pp. 11-14.
  4. Kwak, E. K., "Utilization of Rapidly Cooled Steel Slag as Fine Aggregate for Concrete," Doctoral Dissertations, Kongju University, 2011, pp. 16-29.
  5. Takayama, S., Idemitsu, T., Adia, N., Sugi, M., and Tokuhara, H., "The Utilization of Steel Making Slag Improved by the Method of Steam Aging as Upper Base Materials," Japan Society of Civil Engineering, Vol. 32, 1996, pp. 177-186.
  6. Tanaka, H., Yamada, S., Hasiba, M., and Ozeki, T., "Application of Steel Making Slag for Expansion Agent of Hybrid Composite Pile (鋼管複合パイル用膨脹材としての轉爐滓の活用)," Annual Meeting of JCA, Vol. 35, 1981, pp. 541-544.
  7. Kim, J. M., Cho, S. H., Oh, S. Y., and Kwak, E. G., "Properties of Rapidly-Cooled Steel Slag by Atomizing Process," Magazine of the Korea Concrete Institute, Vol. 9, No. 6, 2007, pp. 39-45. https://doi.org/10.4334/JKCI.2007.19.1.039
  8. Reed, J. S., Principles of Ceramics Processing, Vol. 2, John Wiley and Sons, Inc, New York, 1995, pp. 101-105.
  9. Yoo, S. Y., "Development of Superplasticizer Combined CASB and Performance Improvement of Ultra High Strength Concrete," Doctoral Dissertations, Chung-Ju University, 2011, pp. 52-62.

Cited by

  1. A Fundamental Experiment on Preventing Frost Damage at Early Age of Mortar in Low Temperature using Reduction Slag vol.16, pp.1, 2016, https://doi.org/10.5345/JKIBC.2016.16.1.001