ACHIEVING HIGH LEVELS OF SAFETY ALONG IRELANDS LONGEST BRIDGE

Before the commencement of concrete supply, trials were conducted to assess the mix performance. The trials demonstrated that if the mix arrived onsite too wet the placed concrete was prone too slumping resulting in levels being off. If the mix was too dry, the concrete was prone to setting too quickly, increasing the potential for cracking.

The trials resulted in the slipform contractor requiring a mix within a tight slump tolerance range. As a result, there was a particular focus placed on quality and service with the workability of each load tested prior to dispatch at the supply plant.

Close communication between the slipform contractor and the batching plant proved important to ensure that each load arrived onsite just on time.

The reinforcement was placed through rollers with checks at 5m, 10m and 15m intervals at the commencement of each pour. Additional checks were required at 100m intervals thereafter to ensure the cover and alignment of the steel reinforcement.