Channel Tunnel Rail Link CTRL 250

Hanson UK was involved in the manufacture of the tunnel lining segments for CTRL 250 in 2002, producing over 80,000m3 of concrete.

The CTRL 250 project demonstrated Hanson’s expertise in:

Specialist concrete

•  Developed specialist concrete for steel and polypropylene fibre reinforced segmental tunnel linings.
•  Mix Design incorporating GGBS to reduce micro-cracking and to better prevent the diffusion of chlorides and other aggressive agents.

Tunnel segments

•  Dispensing polypropylene and steel fibres into the concrete mix using vacuum blowing and an Incite AB shaker system.
•  Excellent supply chain management, including dedicated concrete trucks discharging directly into moulds.
•  Prevention of freezing through use of steam generator on aggregate bins.

Sprayed concrete

•  Sprayed concrete using cement from Ketton in various sections of the tunnel.
•  Hanson UK was able to provide specialist technical solutions to maximise efficiency.