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2017 Vol.33, Issue 12 Preview Page
A Study on Crushing and Engineering Characteristics Caused by Compaction of Recycled Aggregates

다짐으로 인한 순환골재의 파쇄 및 공학적 특성에 관한 연구

Sung-Sik Park1
,
KeQiang Chen2
,
Young-Jae Lee3
,
Hong-Duk Moon4*
박 성식1
,
천 커챵2
,
이 영재3
,
문 홍득4*
1Associate Prof., Dept. of Civil Eng., Kyungpook National Univ.
2Graduate Student, Dept. of Civil Eng., Kyungpook National Univ.
3Prof., Dept. of Civil Eng., Kyungpook National Univ.
4Prof., Dept. of Civil Eng., Gyeongnam National Univ. of Science and Technology
1경북대학교 공과대학 건설환경에너지공학부 부교수
2경북대학교 공과대학 건설환경에너지공학부 석사과정
3경북대학교 공과대학 토목공학과 교수
4경남과학기술대학교 건설환경공과대학 토목공학과 교수
*교신저자. *Corresponding Author. 
31 December 2017. pp. 35-44
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Abstract

A large amount of recycled aggregates was produced and crushed from old buildings and pavements. In this study, when these aggregates are re-used in subbase or subgrade materials in near construction sites, their engineering characteristics caused by crushing are investigated in terms of permeability and shear strength. Three different sizes of aggregates (31.5-45.0 mm, 19.0-31.5 mm, 9.5-19.0 mm) and their mixtures, a total of 7 types of aggregates were used in compaction tests (modified D and B methods). After compaction tests, aggregates were sieved and analyzed with four different breakage factors (B15, Cc, B10, Br). The D compaction method gave 2.0-8.0 times more crushable than B compaction method. The breakage factors for the largest size aggregate was 1.4-3.0 times higher than those of the smallest size aggregate. For aggregates with 5.6-9.5 mm sizes, the samples were prepared with B15 of 1, 3, 10, 20, 30, 50, 60, and 70 for permeability and direct shear tests. As B15 increased, the hydraulic conductivity decreased up to 1/22 for B15 = 50. As B15 increased from 1 to 50, the peak friction angle increased from 46.1° to 54.5°. On the other hand, the friction angle decreased after B15 = 60.

Keywords
Recycled aggregate
Crushing
Breakage factor
Hydraulic conductivity
Friction angle

노후화된 콘크리트 포장 및 건물 철거 시 많은 양의 폐콘크리트가 발생하고 있다. 본 연구에서는 폐콘크리트를 파쇄 처리하여 생산된 순환골재가 다시 인근 도로 현장의 노체 또는 노상 재료로 사용될 경우, 다짐으로 인한 파쇄 정도와 입도 변화가 공학적 특성(투수계수 및 전단강도)에 미치는 영향에 대해 연구하였다. 현장에서 수거된 순환골재의 크기를 3 종류(31.5-45.0mm, 19.0-31.5mm, 9.5-19.0mm)로 나눈 다음, 이를 일정한 비율로 혼합한 총 7 종류의 시료를 대상으로 수정 B 및 D 다짐시험을 실시하였다. 다짐으로 파쇄된 순환골재에 대한 체분석을 실시하여 다짐 에너지와 골재 크기에 따른 파쇄 정도를 4 종류의 파쇄지수(B15, Cc, B10, Br)로 계산하였다. 다짐에너지에 따른 파쇄지수는 지수에 따라 D 다짐의 경우가 2.0-8.0배 정도 더 높은 파쇄성을 보였으며, 가장 큰 골재의 파쇄성이 가장 작은 골재에 비해 1.4-3.0배 정도 더 높았다. 한편, 5.6-9.5mm 사이 순환골재를 분쇄하여 파쇄지수 중 B15에 따라 1, 3, 10, 20, 30, 50, 60, 70이 되도록 입도 조정한 시료에 대해 투수시험과 직접전단시험을 실시하였다. 파쇄지수(B15)가 증가함에 따라 투수계수는 계속 감소하였으며, 파쇄지수가 50일 경우 1/22까지 감소하였다. 한편, 순환골재의 마찰각은 파쇄지수가 1에서 50까지 증가함에 따라 46.1°에서 54.5°까지 증가하다가 60 이후는 다시 감소하는 경향을 보였다.

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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 : 33
  • No :12
  • Pages :35-44
  • Received Date : 2017-09-27
  • Revised Date : 2017-11-07
  • Accepted Date : 2017-11-22
  • DOI :https://doi.org/10.7843/kgs.2017.33.12.35
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