With high performance, it’s complimented by the fact it is made from recycled glass and is deemed non-combustible. Reapor was then specified to be affixed to the tunnel lower walls. Viterolite 900 was cast into large tiles custom designed to fit in between tracks. One track absorber for the tunnel floor and another for the tunnel walls. Viterolite 900 is a 100% non‐combustible, concrete‐like material with high impact resistance and a broad range of frequency absorption to address the project’s difficult criteria. When approached by NRT, Pyrotek proposed two materials. The complete system was engineered to create the best environment possible with calculations successfully predicting to overcome noise level requirements to deliver greater comfort for commuters. Pyrotek secured the contract to work with NRT against global competitors after presenting Viterolite 900 as the solution for the floor between tracks in the underground rail tunnels.
Northwest Rapid Transit (NRT) was awarded the operations, trains and systems contract to improve comfort & safety in carriages, with maximum noise levels of 78 dB(A) specified within passenger areas of carriages when operating in the tunnels.
Also, a designated pathway as a method of safe egress meant materials needed to be "trafficable", and durable enough to be walked on during an emergency or in times of routine maintenance.
Non-combustibility was crucial to ensure the material will not emit smoke or toxic fumes particularly with regard to inhalation in the case of a fire emergency in the tunnel. Sydney Metro Northwest, the first stage of Australia’s largest new public transport project runs from Rouse Hill to Epping including twin15 km tunnels, a 4 km elevated skytrain, and 270 metre cable-stayed bridge.Ī suitable absorbing material to reduce reverberation was required to line the tunnel near tracks and walls, however, it would safely need to form part of a fire safe environment.
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