Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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An optimal mix design of sound absorbing block on concrete ballast in urban train tunnel

도시철도 터널내 콘크리트 도상용 흡음블럭의 최적 배합설계

  • Lee, Hong-Joo (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Oh, Soon-Taek (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Lee, Dong-Jun (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 이홍주 (서울과학기술대학교 건설시스템공학과) ;
  • 오순택 (서울과학기술대학교 건설시스템공학과) ;
  • 이동준 (서울과학기술대학교 건설시스템공학과)
  • Received : 2015.12.21
  • Accepted : 2016.01.11
  • Published : 2016.01.30
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Abstract

As spreading of train concrete ballast leads to the increase resounding friction noise, an porous sound absorbing block is applied in urban train tunnel as a counterparts against the friction noise. Three steps of major variables tests for an optimal mix design of the block are conducted to pursue the light weight of the block. Pilot property tests of the block for the cases of the fly-ash only as lightweight aggregates are carried satisfying KRT(Korean Rail Transit) and new KRS(Korean Railway Standards). Based on the results of pilot tests, required structural strength and admixture effects are evaluated. Additionally, typical lightweight aggregates are replaced so that lightweight and strength are improved for serviceability of poor working conditions and proper maintenance in urban train tunnel.

최근 도시철도 터널내부에서 콘크리트 도상의 확대로 유발된 반사마찰소음에 대한 저감대책으로 다공성 흡음블럭이 적용되고 있다. 운영 중인 도시철도용 품질시험기준과 제정 중인 철도표준규격을 만족하는 흡음블럭의 개발을 위하여 3 단계의 최적 배합설계를 위한 주요 변수시험을 수행하였다. 순환 골재인 플라이애쉬를 혼합하여 건비빔 발포 시료를 개발하여 요구되는 구조성능을 시험하고 혼화재의 영향성을 평가하였다. 또한 도시철도 터널 내부에 시공할 경우 열악한 작업환경과 원활한 유지관리에 대한 대책으로 대표적인 경량골재들을 혼합하여 경량화와 구조성능을 평가하였다.

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References

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