An optimal mix design of sound absorbing block on concrete ballast in urban train tunnel
도시철도 터널내 콘크리트 도상용 흡음블럭의 최적 배합설계

Hong-Joo Lee, Soon-Taek Oh, Dong-Jun Lee
2016 Journal of Korean Tunnelling and Underground Space Association  
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
more » ... 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.
doi:10.9711/ktaj.2016.18.1.075 fatcat:jkbap4dwjzaqbm2kmb62bfzk2a