Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Enhancement of the Strength of MgO-Based Binder by Accelerated Carbonation

촉진탄산염화에 의한 마그네슘계 고화제의 강도 향상 특성

  • Yun, Do Youn (School of Civil & Environmental Engineering, Pusan National University) ;
  • Ahn, Jun-Young (School of Civil & Environmental Engineering, Pusan National University) ;
  • Kim, Cheolyong (School of Civil & Environmental Engineering, Pusan National University) ;
  • Kim, Tae Yoo (School of Civil & Environmental Engineering, Pusan National University) ;
  • Hwang, Inseong (School of Civil & Environmental Engineering, Pusan National University)
  • 윤도윤 (부산대학교 사회환경시스템공학과) ;
  • 안준영 (부산대학교 사회환경시스템공학과) ;
  • 김철용 (부산대학교 사회환경시스템공학과) ;
  • 김태유 (부산대학교 사회환경시스템공학과) ;
  • 황인성 (부산대학교 사회환경시스템공학과)
  • Received : 2016.11.15
  • Accepted : 2016.12.08
  • Published : 2016.12.31
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Abstract

MgO recently has been regarded as the alternative material for replacement of cement. The aim of this study is to investigate the effects of accelerated carbonation on the strength development of MgO-based binder which is binary mixtures of magnesium oxide (MgO) with portland cement (PC) or ground granulated blast furnace slag (GGBS) or fly ash (FA). The compressive strengths of all binders were higher in the 20% $CO_2$ condition and for longer curing time. The strength were generally higher as the following order: MgO/PC > MgO/GGBS > MgO/FA system. The binder composed of 20% MgO and 80% PC showed highest compressive strength (38.0MPa) which was higher than PC. The correlation analysis of the porosity and compressive strength showed that compressive strength was higher when porosity was lower. The hydration and carbonation products of MgO including brucite ($Ca(OH)_2$), magnesite ($MgCO_3$) and nesquehonite ($MgCO_3{\cdot}3H_2O$) presumably filled the pores and contributed to strength development. Thermogravimetric analyses elucidated that 0.34 kg of $CO_2$ could be stored the 50% MgO/50% PC binder which performed the maximum $CO_2$ uptake at 20% $CO_2$ condition.

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References

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