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

Sungchul Kang; Gyeonghun Kim; Jihae Wi; Taebong Ahn; Dae-Soo Lee; Hangseok Choi

doi:10.7843/kgs.2015.31.10.17

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2015 Vol.31, Issue 10 Preview Page Next Page

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

31 October 2015. pp. 17-28

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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.

Keywords

Recycled aggregate

Compaction

Thermal resistivity

Particle breakage

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.

References

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 31
No :10
Pages :17-28
Received Date : 2015-08-18
Revised Date : 2015-09-26
Accepted Date : 2015-09-30
DOI :https://doi.org/10.7843/kgs.2015.31.10.17

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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