Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Carbonation Behavior of GGBFS-based Concrete with Cold Joint Considering Curing Period

재령 변화에 따른 콜드조인트를 가진 GGBFS 콘크리트의 탄산화 거동

  • Cho, Sung-Jun (Department of Civil and Environmental Engineering, Hannam University) ;
  • Yoon, Yong-Sik (Department of Civil and Environmental Engineering, Hannam University) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Engineering, Hannam University)
  • 조성준 (한남대학교 토목환경공학과) ;
  • 윤용식 (한남대학교 토목환경공학과) ;
  • 권성준 (한남대학교 토목환경공학과)
  • Received : 2018.09.28
  • Accepted : 2018.12.11
  • Published : 2018.12.30
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Abstract

In the work, the carbonation behavior and strength characteristics in cold-joint concrete are evaluated for OPC(Ordinary Portland Cement) and GGBFS(Ground Granulated Blast Furnace Slag)concrete considering three levels of curing age (28, 91 and 365 days). The compressive strength in GGBFS concrete is level of 86% of OPC concrete at the 91 days of curing period, but is level of 107% at 365 curing days due to hydration reaction. Carbonation velocities in both OPC and GGBFS concrete significantly decease after 91 curing days. The effect of cold joint on carbonation is evaluated to be small in GGBFS concrete. The increasing ratios of carbonation velocity in cold joint are 1.06 and 1.33 for 28-day and 365-day curing condition, respectively. However they decreases to 1.08 and 1.04 for GGBFS concrete for the same curing conditions.

본 연구에서는 3가지 수준의 재령(28일, 91일, 365일)을 고려하고 OPC 콘크리트와 GGBFS 콘크리트를 대상으로 콜드조인트 콘크리트의 탄산화 거동 및 강도특성을 평가하였다. GGBFS 콘크리트의 압축강도는 91일에서 OPC 콘크리트의 86% 수준이었으나, 지속적인 수화반응으로 인해 재령 365일 재령에서는 107%로 높게 평가되었다. 탄산화 속도계수는 91일을 기점으로 OPC 및 GGBFS 콘크리트 모두 크게 감소하였으며 콜드조인트 효과는 OPC 콘크리트에서 크게 평가되지만 GGBFS 콘크리트에서는 비슷한 수준으로 평가되었다. 콜드조인트에서 OPC 콘크리트의 경우 28일에서는 1.06배, 365일에서는 1.33배 수준으로 탄산화 속도계수가 증가하였다. 그러나 GGBFS 콘크리트의 경우 28일에서는 1.08배, 재령 365일에서는 1.04배로 큰 차이가 발생하지 않았다.

Keywords

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Fig. 1. Representative of carbonation behavior(Ishida et al. 2003)

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Fig. 2. Performance in cold joint concrete with delayed concrete placing(JSCE. 2000)

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Fig. 3. Photos for making speciman of concrete

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Fig. 4. Photos of disk concrete

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Fig. 5. Photo of the carbonation test of concrete

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Fig. 6. Results of compressive strength

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Fig. 7. Carbonation velocity coefficient of OPC concrete

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Fig. 8. Comparative analysis of carbonation velocity coefficient

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Fig. 9. Carbonation velocity coefficient of GGBFS concrete

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Fig. 10. Comparative analysis of carbonation velocity coefficient

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Fig. 11. Comparative analysis between OPC and GGBFS concrete

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Fig. 12. Carbonation velocity coefficient considering cold joint and GGBFS

Table 1. Mixing design of OPC and GGBFS concrete

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Table 2. Chemical composition of OPC and GGBFS

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Table 3. Accelerated carbonation test conditions

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Table 4. Result of compressive strength

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Table 5. Result of depth of carbonation

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Table 6. Carbonation velocity coefficient of OPC concrete

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Table 7. Result of depth of carbonation

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Table 8. Carbonation velocity coefficient of GGBFS concrete

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