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고로슬래그 자극재로써 건식 및 습식 배연탈황석고의 활용가능성 평가

Use of Flue Gas Desulfurization Gypsum as an Activator for a Ground Granulated Blast Furnace Slag

  • Lee, Hyun-Suk (Department of Architectural Engineering, Pukyong National University) ;
  • Kim, Ji-Hyun (Department of Architectural Engineering, Pukyong National University) ;
  • Lee, Jae-Yong (Department of Architectural Engineering, Pukyong National University) ;
  • Chung, Chul-Woo (Department of Architectural Engineering, Pukyong National University)
  • 투고 : 2017.02.24
  • 심사 : 2017.07.14
  • 발행 : 2017.08.20

초록

화력발전소의 전력 생산을 위한 연료의 연소 시 발생한 황산화물의 제거과정에서 생산되는 배연탈황석고의 경우 현재까지는 적극적인 재활용이 되지 않고 있다. 본 연구는 화력발전소의 배연탈황공정인 건식, 습식공법을 통해 발생된 배연탈황석고의 슬래그 자극재로써의 활용가능성을 연구하기 위하여 일정량의 건식 및 습식 배연탈황석고를 고로슬래그 미분말에 치환하고, 슬래그 페이스트를 제작한 후, 그에 따른 수화반응 특성과 압축강도 특성을 분석해서 슬래그 자극재나 천연석고의 대체재로서 역할을 할 수 있는지 검토하고자 하였다. 본 연구의 결과에 따르면, 건식 배연탈황석고의 경우 별도의 알칼리 자극이 없어도 슬래그를 충분히 자극하는 것으로 보이며, 습식배연탈황석고의 경우 일정수준 이상의 알칼리 자극이 주어져야만 충분한 슬래그 자극효과를 볼 수 있는 것으로 나타났다. 또한 건식과 습식 배연탈황석고를 슬래그 페이스트에 적정량 치환하면 슬래그 페이스트의 압축강도 개선효과를 얻을 수 있는 것으로 나타났다. 추후 추가적인 연구를 통해 치환율에 따른 강도증진 성상을 정량적으로 규명하면 배연탈황석고의 효율적 경제적 재활용이 가능하게 될 것으로 사료된다.

Flue gas desulfurization gypsum(FDG) is produced when removing sulfur oxides from combustion gas generated by coal power plant. However, the recycling of FDG is still limited to the certain purposes. In order to expand the possible application of FDG, this study aims to utilize FDG as an activator for ground granulated blast furnace slag. FDG produced by dry- and wet-process were used for the experiments. Slag paste specimens were produced by mixing with deionized water and simulated pore solution, and the role of FDG as an activator for blast furnace slag was evaluated using hydration study by XRD analysis and compressive strength development. According to the results, dry-type FDG was found to work as an activator for blast furnace slag without the presence of soluble alkalis. However, wet-type FDG needs assistance by soluble alkalis in order to work as an activator for blast furnace slag. It was also found that the substitution of dry- and wet-type FDG into blast furnace slag can increase the 28 day compressive strength of slag paste. It is expected that efficient and economical recycling of FDG will be possible if quantitative analysis of strength enhancement according to substitution rate of both dry- and wet-type FDG.

키워드

참고문헌

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피인용 문헌

  1. Revisiting the Effect of Slag in Reducing Heat of Hydration in Concrete in Comparison to Other Supplementary Cementitious Materials vol.11, pp.10, 2018, https://doi.org/10.3390/ma11101847