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An Experimental Study on the Setting Time and Compressive strength of Mortar using Ferronickel Slag Powder

페로니켈슬래그 미분말을 사용한 모르타르의 응결시간 및 압축강도특성에 관한 실험적 연구

  • Kim, Young-Uk (Department of Architectural Engineering, Wonkwang University) ;
  • Kim, Do-Bin (Department of Architectural Engineering, Wonkwang University) ;
  • Choi, Se-Jin (Department of Architectural Engineering, Wonkwang University)
  • Received : 2018.09.06
  • Accepted : 2018.11.12
  • Published : 2018.12.20

Abstract

This study evaluate the fluidity and hardening properties of mortar by replacement ratio of ferronickel slag powder to estimate the applicability of ferronickel slag powder for cement replacement materials. Ferronickel slag powder was replaced by 0, 5, 10, 15 and 20% of the cement weight. In addition, blast furnace slag powder and fly ash were also used for comparing with the mixtures using ferronickel slag powder. As the test results, the micro-hydration heat of the mixture containing the ferronickel slag powder was lower than that of the mixtures containing the same amount of blast furnace slag powder and fly ash. The flow of the sample with ferronickel slag powder was relatively higher than the other mixtures. In all ages, the compressive strength of the mixture with ferronickel slag powder and fly ash was similar to that of the mix containing only fly ash. In case of drying shrinkage, the mixture containing ferronickel slag powder exhibited lower drying shrinkage than the mixture using blast furnace slag powder, and similar to the mixture containing fly ash.

본 연구에서는 페로니켈슬래그 미분말의 시멘트 대체재로서의 가능성을 평가하기 위하여 페로니켈슬래그 미분말 사용 모르타르의 압축강도 및 건조수축특성을 비교 분석하였다. 연구결과 페로니켈슬래그 미분말을 사용한 배합의 경우 동일한 양의 고로슬래그 미분말 및 플라이애시를 사용한 배합에 비해 미소수화열량이 낮게 나타났으며 모르타르 플로우는 상대적으로 다소 높은 것으로 나타났다. 또한 페로니켈슬래그 미분말을 사용한 모르타르의 압축강도의 경우 초기 강도발현은 고로슬래그 미분말 및 플라이애시와 유사하게 나타났으나 재령 28일에서는 상대적으로 낮은 압축강도를 발현하였다. 건조수축의 경우 페로니켈슬래그 미분말을 사용한 배합에서 고로슬래그 미분말을 사용한 배합에 비해 낮은 건조수축값을 나타내었으며 플라이애시를 혼입한 배합의 건조수축과 유사하게 나타났다.

Keywords

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Figure 1. Ferronickel slag

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Figure 2. SEM image of ferronickel slag powder

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Figure 3. Multi micro calorimeter

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Figure 4. Demec strain gauge

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Figure 5. 72 hours maximum microhydration heat

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Figure 6. Mortar flow (Series I)

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Figure 7. Mortar flow (Series II)

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Figure 8. Setting time (Series I)

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Figure 9. Setting time (Series II)

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Figure 10. Compressive strength (Series I)

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Figure 11. Compressive strength (Series II)

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Figure 12. Drying shrinkage (Series I)

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Figure 13. Drying shrinkage (Series II)

Table 2. Mix proportions and Test plan

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Table 1. Chemical composition of powders

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Table 3. Test result

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