CRL was engaged to deliver multiple work packages on the North-East Link Project, including base slab waterproofing and structural crack repair across three sites, totalling 75,000m² of waterproofing membrane. All works were completed using Sika’s Sikaplan WP system with compartmentalisation.

In January 2025, works commenced at Southern Surface Works(SSW), where the base slab tanking was followed by structural crack epoxy injection works at the Western Abutment Wall—part of the tunnel entry and future land bridge support structure. While the original crack map identified only three cracks, detailed inspection revealed many more, exceeding 0.2mm in width. These were approved by the client for repair using Nitofill LV injected through surface-mounted packers epoxied in place with Nitomortar AP. Post-injection, Ultrasonic Pulse Velocity (UPV) testing was performed to verify complete crack filling in accordance with VicRoads standards.

In April 2025, works commenced at the Manningham base slab, starting with D-wall substrate preparation and micropile termination detailing. Geotextile and Sikaplan membrane were then installed, followed by application of auxiliary components to form reinjectable compartments.

By May 2025, CRL commenced work at Lower Plenty, beginning with D-wall injection using Sika Injection 306—a four-component acrylic material—to seal the first 2 metres of the D-wall at the base slab interface. Subsequent stages included micropile terminations and full base slab waterproofing.

All works were independently tested by a third-party inspector to ensure waterproofing integrity at handover.

Testing includes:

• Weld testing of membrane joints
• Compartment pressure testing
• Verification of epoxy injection using UPV at  SSW
• Daily QA documentation including photographic     evidence, test logs, and supervisor sign-off

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