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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

Hong-Joo Lee1
,
Soon-Taek Oh2*
,
Dong-Jun Lee3
이 홍주1
,
오 순택2*
,
이 동준3
1MS Candidate, Department of Civil Engineering, Seoul National University of Science and Technology
2Professor, Department of Civil Engineering, Seoul National University of Science and Technology
3Researcher, Department of Civil Engineering, Seoul National University of Science and Technology
1서울과학기술대학교 건설시스템공학과 석사과정
2서울과학기술대학교 건설시스템공학과 교수
3서울과학기술대학교 건설시스템공학과 연구원
*교신저자. *Corresponding Author. 
31 January 2016. pp. 75-82
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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.

Keywords
Light sound absorbing block
Concrete ballast
Lightweight aggregate
Optimal mix design
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.

키워드
경량 흡음블럭
콘크리트 도상
경량골재
최적배합설계
도시철도 터널구간
References
1
1.Choi, I.Y. (2009), “Noise absorptive concrete panel for railway slab”, Korea Intellectual Property Information Service, KIPRIS 10-0910171.
2
2.Choi, P.G., Park, W.I., Yun, K.K., Lee, B.H. (2010), “Air-void structure of very-early strength latex-modified concrete using ultr-fine fly ash”, Journal of Korean Society of Hazard Mitigation, Vol. 10, No. 2, pp. 47-53.
3
3.Kang, S.P. (2012), “A study on the effect of high- calcium fly ash on the compressive strength of the portland blast-furnace slag cement concrete”, Journal of the Construction and Environment Research Institute, Vol. 7, No. 1, pp. 23-30.
4
4.Kang, D.M., Seo, J.W., Lee, I.Y., Park, Y.G. (2008), “A study on the sound absorption properties of sound absorption block using by artificial light weight aggregate”, Conference of The Korean Society for Railway, The Korean Society for Railway, pp. 803-839.
5
5.KRRI, Seoul Metro, KRTC, GETPC (2013), “Ballast sound absorbing block of urban railway”, Korea Intellectual Property Information Service, KIPRIS 10-1276083, 2013.
6
6.KRS (2015), “Noise absorption materials on track bed”, Korean Railway Strandard, KRS TR 0016- 15.
7
7.Yoo, S.B., Lee, A.H., Kim, S.J., Kang, K.D. (2011), “A study on the sound absorption effect of concrete track the sound absorption blocks in urban transit”, Conference of Korean Society of Railway, pp. 329-336.
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 18
  • No :1
  • Pages :75-82
  • Received Date : 2015-12-21
  • Revised Date : 2016-01-06
  • Accepted Date : 2016-01-11
  • DOI :https://doi.org/10.9711/KTAJ.2016.18.1.075
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