Project Detail
  • Tunnels

    WestConnex M4E Tunnel

    Sydney, New South Wales, Australia

    Contractors CPB Samsung John Holland JV chose to use shotcrete treated with Xypex Crystalline Technology for the waterproofing of the tunnel. As typical, the underground excavation was first stabilized with a primary layer of shotcrete for the safety of the excavation.

    After that, a layer of Xypex-treated shotcrete was applied directly onto the primary lining, which serves as both the secondary lining and the waterproofing for the tunnel. This portion of the WestConnex project used a total of 5,578 m3 of Xypex- treated shotcrete for these purposes. 

    Xypex is a unique chemical treatment for the waterproofing, protection, and improvement of concrete. Xypex Admix C-1000/C-1000 NF is added to the concrete mix at the time of batching and consists of various active, proprietary chemicals.

    These active chemicals react with the byproducts of cement hydration in the presence of moisture to cause a catalytic reaction. This reaction generates a non-soluble crystalline lattice throughout the pores and capillary tracts of the concrete. This crystalline lattice permanently seals the concrete and prevents the penetration of water.

    The incorporation of Xypex Admix C-1000NF proved highly effective. Not only did it provide a permanent waterproofing solution, but it also yielded considerable cost and time savings for the project. The Xypex-treated shotcrete waterproofing system eliminated the need for an additional shotcrete smoothing layer over the primary lining required by sprayed waterproofing membranes. It also eliminated the application of the membrane itself, cutting two additional processes from the tunnel construction.  

    As a result of the success of the M4E Tunnel project, CPB contractors have continued the use of the Xypex tunnel waterproofing method on future projects.

    To learn more on how Xypex Crystalline Waterproofing protects tunnels, please click here.

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