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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.18 No.1
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An optimal mix design of sound absorbing block on concrete ballast in urban train tunnel

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2016, v.18 no.1, pp.75-82
https://doi.org/10.9711/KTAJ.2016.18.1.075



& (2016). An optimal mix design of sound absorbing block on concrete ballast in urban train tunnel. (사)한국터널지하공간학회, 18(1), 75-82, https://doi.org/10.9711/KTAJ.2016.18.1.075
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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, 경량 흡음블럭, 콘크리트 도상, 경량골재, 최적배합설계, 도시철도 터널구간

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