The Second Severn Crossing

Project Summary:

Bridge project: Crossing point for the M4 motorway, over the Severn Estuary

 Start/finish dates: 1992/1996

 Bridge type: Cable-stayed

 Length: 5km (456m main span)

 Structure: 150m concrete pylons, precast cross beams, composite deck and twin box girder viaduct

 Production: Precast on shore and shipped into position

 Tidal range: 14.5m

 Main Contractor: Laing-GTM

 Product and volume supplied by Hanson:

  •  All aggregate, cement (Ketton), Regen (GGBS/Llanwern) and asphalt/laying 
  •  C70 concrete mixes for piles, foundation and bridge segments (6500 ton ship at 20 knots)
  •  CEM I and between 20% and 70% Regen (GGBS) mixes (durability, control of heat of hydration and colour)
  •  Concrete volume 320,000m3
  •  Regen volume 60,000m3
United Kingdom