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Effect of Particle Breakage on Compaction and Thermal Resistivity of Concrete-based Recycled Aggregates

콘크리트 재생 순환골재의 파쇄 효과에 따른 다짐 및 열저항 특성 연구

  • Kang, Sungchul (Yujingeo Co., Ltd.) ;
  • Kim, Gyeonghun (School of Civil, Environmental and Architectural Engineering, Korea Univ.) ;
  • Wi, Jihae (School of Civil, Environmental and Architectural Engineering, Korea Univ.) ;
  • Ahn, Taebong (Dept. of Railroad Civil System Engineering Woosong Univ.) ;
  • Lee, Dae-Soo (Dept. Chief, Korea Electric Power Research Institute) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
  • 강성철 (유진지오(주)) ;
  • 김경훈 (고려대학교 건축사회환경공학부) ;
  • 위지혜 (고려대학교 건축사회환경공학부) ;
  • 안태봉 (우송대학교 철도건설시스템학과) ;
  • 이대수 (한국전력공사 전력연구원) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2015.08.18
  • Accepted : 2015.09.30
  • Published : 2015.10.31

Abstract

The strict regulations on eco-friendly construction and the significant reduction of natural aggregate resources have raised public concerns on the utilization of recycled aggregates for backfilling a power transmission pipeline trench. In this paper, the particle breakage of concrete-based recycled aggregates and river sand has been experimentally studied during the standard compaction test. The applied compaction energy does not significantly break the river sand particles down, and thus causes no change in the compaction curve, thermal resistivity, and particle gradation characteristics. On the other hand, considerable particle breakage was observed in case of the three recycled aggregates. Such particle breakage leads to enhancing compaction effort, reducing thermal resistivity, and changing particle gradation curve with finer particles that are broken during the first compaction. In addition, particle breakage is more dramatic in lower water contents because pore water may damp down the compaction energy.

최근 친환경 건설에 대한 엄격한 규제와 가용한 천연골재 자원의 고갈에 따른 대안으로 전력구 되메움재로서 순환골재에 대한 관심이 급증하고 있다. 본 논문에서는 일반적인 되메움재인 강모래와 콘크리트 재생 순환골재를 대상으로 다짐에너지가 가해질 때, 발생하는 골재의 입자파쇄를 실내다짐시험을 통해 규명하였다. 적용된 다짐에너지 수준에서 일반 강모래는 입자파쇄가 미미하여 다짐 전후 골재의 다짐특성과 열저항의 변화가 매우 적었다. 반면에 일반 강모래에 비하여 순환골재는 재생과정에서 이미 입자에 큰 응력이 가해진 상태이므로 추가 다짐에너지에 의한 입자파쇄가 발생했다. 다짐에 의한 순환골재 입자파쇄는 세립분 양을 증가시켜 전반적으로 되메움재의 열저항을 감소시키고 입도곡선의 모양을 변화시켰다. 특히, 순환골재의 입자파쇄는 다짐에너지의 댐핑이 상대적으로 적은 저함수비 구간에서 더 뚜렷하게 발생하였다.

Keywords

References

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