Concrete Services
The M12 Motorway is a key infrastructure project in Western Sydney, providing a direct connection between the M7 Motorway and the new Western Sydney International (Nancy-Bird Walton) Airport. The Western section, delivered by CPB Contractors and Georgiou JV on behalf of Transport for NSW, includes approximately six kilometres of dual carriageway, bridges, retaining walls, drainage, and safety barriers

Dowsing Group was engaged to deliver machine-laid slipform barriers, extruded kerbing and low noise diamond grinding works to support the project’s pavement quality, safety, and long-term performance objectives.

Client

CPBGG JV (CPB & Georgiou)

Sector

Infrastructure

Project Type

Slipform Barriers, Kerbing, LNDG

Location

Western Sydney, NSW

Duration

Jan 2024 - Jun 2025

Type

Construct Only
Scope of Works

Dowsing’s works involved the construction of machine-laid TL-4 concrete barriers, kerbing in various profiles and a combination of diamond grinding and grooving treatments to meet ride quality and surface finish specifications.

  •  7,000lm of TL-4 double-sided wall slipform barrier construction
  • 6,600lm kerbing (various profiles)
  • 20,250m² conventional diamond grinding (patch)
  • 10,900m² flush diamond grinding (patch)
  • 92,402m² grooving
  • Continuous placement of high-strength concrete using slipform paving machine to TL-4 profile
  • Surface finish verification and QA testing in accordance with TfNSW specification requirements

Dowsing successfully constructed compliant TL-4 slipform barrier, achieving consistent alignment, profile, and structural performance in accordance with TfNSW specifications.

By supporting the CPBGG JV’s revised pavement strategy, Dowsing optimised program efficiency and resource utilisation while maintaining road safety and functional outcomes. All works were completed safely, on schedule, and to specification, reinforcing Dowsing’s capability in delivering large-scale slipform and diamond grinding works for major road infrastructure projects.

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