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Characterization of Flowable Fill with Ferro-Nickel Slag Dust

페로니켈 슬래그 미분말을 이용한 유동성 뒤채움재 특성

  • Lee, Kwan-Ho (Dept. of Civil Engineering, Kongju National University)
  • 이관호 (국립공주대학교 건설환경공학부)
  • Received : 2017.01.31
  • Accepted : 2017.05.12
  • Published : 2017.05.31

Abstract

The aim of this study was to utilize ferronickel slag produced in the manufacture of stainless steel as a flowable backfill material for underground use using crushed fine powder. Experimental combinations were made using two components: Case A (sand) and Case B (soil). The optimal mixing ratio of Case A was sand (58.4%), ferronickel slag fine powder (21.6%), cement (1.8%), and water (18.2%). In the case of B, the optimal mixing ratio was determined to be soil (53.0%), ferronickel slag fine powder (20.0%), cement (1.7%), and water (25.3%). The uniaxial compressive strength of case A, which is a mixture of ordinary sand and ferronickel slag powder, was relatively larger than that of case B using soil. In addition, the strength of the specimen increased with increasing curing time. The uniaxial compressive strength tended to increase with increasing curing time. In addition, the unconfined compression strength of the fluid backfill material using common sand as the main material was relatively larger than that of the mixed material using soil as the main material. In case A, the uniaxial compressive strength ranged from 0.17-0.33 MPa, 0.21-0.39 MPa, and 0.19-0.40 MPa, respectively, at curing times of 7, 14, and 28 days. From the experimental results, it was concluded that the ratio of FNS powder and cement mixture was the most appropriate for Case A3. Case B, which used soil as the main material, showed a similar tendency to Case A. As a result of the dissolution test for evaluating the environmental harm of the FNS fine powder, there was no dissolution of substances harmful to the environment.

Keywords

Ferro-Nickel Slag;Flowable Backfill;Optimim Mixing Ratio;Compressive Strength;Flowability

Acknowledgement

Supported by : 국토교통과학기술원

References

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