Tunnel Projects

The joints of the pre-cast unit and the basement core on level 4 of this service tunnel suffered water ingress. During the repair of the tunnel, water ingress measured 3,500 litres/hour and the entire area was under 44 mm of water during the rainy season. All joints were treated with Xypex Patch'n Plug, Dry-Pac and FCM. Xypex Admix C-1000 NF was then used in the new concrete fill.

Approximately 11,000 linear meters of cracks were repaired with Xypex Patch'n Plug to stop water ingress through the construction joints of this tunnel. A surface area of 5,600 m² was waterproofed with Xypex Concentrate and Modified.

Xypex Ultra Plug was used to prevent water leakage from the cracks and construction joints of the original box culvert tunnel. Xypex Concentrate was then applied to the entire surface. To reinforce the ‘box’, a U shaped concrete lining, using Xypex Admix C-2000 was then installed.

This tunnel passes under the lagoon in Ibirapuera park. A two-coat shotcrete application of Xypex Concentrate was applied to 2,800 meters of concrete, in two separate tubes within the tunnel. Xypex Patch'n Plug was used to seal the cracks with water seepage.

Xypex Admix, with a colored pigment, was used to stop water penetration into the underground tunnels and wine-storage caves. Xypex Patch’n Plug was used to repair larger cracks.

The Xypex products Concentrate and Patch'n Plug were used for crack repairs in equipment rooms and portable water tanks.

Prior to project start-up, CSI installed mechanical mix equipment that allows the concrete mix crews to monitor and quality check the quantity of Xypex Admix added to each pre-cast box. As the concrete cures, Xypex permanently seals the box to prevent the flow of liquids from the outside in, and the inside out. Time of manufacturing to shipping was cut from 30 days to less than 10.

The tunnel was to be built on a high water table and its entire length needed waterproofing; shoring of the walls would interfere with any barrier-type system; considerable rebar work was needed on the floor, thus raising the risk of damaging a membrane; and the ceiling would be covered with a 10-ft.-deep backfill making a membrane impractical to repair. Xypex Admix was the answer to all these concerns. 

Xypex Admix C-1000 NF was dosed into concrete roof elements of the Landbridge, Inner Northern Busway Tunnel and the RNA Tunnel as part of the Brisbane Inner City Bypass project. In excess of 3,000 cubic metres of concrete was dosed with Xypex for waterproofing and durability requirements. Xypex Admix C-1000 NF was dosed into concrete roof elements of the Land bridge, Inner Northern Busway Tunnel and the RNA Tunnel. In excess of 3,000 m³ of concrete was dosed with Xypex Admix C-1000 NF for waterproofing and durability requirements.

The concrete of the tunnel is solely waterproofed with Xypex products. The concrete of the walls, ceiling and slab of both the precast and cast in place are waterproofing with Xypex Admix C-1000 NF dosed at approximately 1% of the cementitious content of the mix. The joints of the cast in place section are waterproofed using typical bentonite and steel plane composite waterstops as well as a slurry coat of Xypex Concentrate.