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Activation Property of Blast furnace Slag by Alkaline Activator

알칼리 자극제에 의한 고로수쇄슬래그의 활성화 특성

  • Ahn, Ji-Whan (Vinerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Jin-Sang (Vinerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Hyung-Seok (Vinerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Gi-Chun (Vinerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Ki-Suk (Vinerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Hwan (Department of Materials Science and Engineering)
  • 안지환 (한국지질자원연구원 자원활용소재연구부) ;
  • 조진상 (한국지질자원연구원 자원활용소재연구부) ;
  • 김형석 (한국지질자원연구원 자원활용소재연구부) ;
  • ;
  • 한기석 (한국지질자원연구원 자원활용소재연구부) ;
  • 김환 (서울대학교 재료공학부)
  • Published : 2003.10.01

Abstract

This paper examines the hydration and physical properties of alkali-blast furnace slag cement activated by Na$_2$SiO$_3$, Na$_2$CO$_3$, NaOH, Na$_2$SO$_4$. Four levels of Na$_2$O content in mixtures, 1, 3, 5, and 7 wt%, were investigated, and a W/S ratio 0.5 was used to prepare paste and mortar specimens. Compressive strength measurement of mortars was carried out adding alkali activated slag 30 wt% to OPC. The main hydration products with alkali activator kinds were C-S-H,C$_4$AH$\_$13/, AFt and Al(OH)$_3$ etc. For using Na$_2$CO$_3$ activated slag, hydration ratio of slag was higher than that of different activators, and Na$_2$SO$_4$ activated slag mortar appeared the highest compressive strength values at 28 days with activator content of 5 and 7 wt%.

알칼리 자극제의 종류에 따른 고로수쇄슬래그의 수화 및 물리적 특성을 조사하였다 활성화제는 $Na_2$SiO$_3$, $Na_2$CO$_3$, NaOH, $Na_2$SO$_4$를 사용하였고, $Na_2$SiO$_3$, $Na_2$CO$_3$, $Na_2$SO$_4$$Na_2$O, NaOH는 $\frac{1}{2}$$Na_2$O로 환산하여 1, 3, 5, 7 wt%를 첨가한 후 W/S=0.5로 실험을 실시하였다. 또한, 압축강도 실험은 OPC에 대해 각각 30 wt% 첨가하여 실험을 하였다. 활성화제의 종류에 따라 주요 수화생성물은 C-S-H, $C_4$AH$_{13}$, AFt, Al(OH)$_3$ 등이었으며, $Na_2$CO$_3$의 경우가 가장 큰 슬래그의 수화율을 보였다. $Na_2$SO$_4$를 사용하였을 때 압축강도가 가장 크게 나타났다.

Keywords

References

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  2. on Early Strength of High Volume Slag Cement vol.28, pp.3, 2016, https://doi.org/10.4334/JKCI.2016.28.3.349
  3. The Strength Properties of Alkali-Activated Slag Mortars by Combined Caustic Alkali with Sodium Carbonate as Activator vol.24, pp.6, 2012, https://doi.org/10.4334/JKCI.2012.24.6.745