Sika ViscoCrete® admixture for major tunnel project

The Waterview Connection project is one of the most important infrastructure developments ever to take place in New Zealand. Completing a motorway ring route around the city, it will combat regional congestion and create a direct, time-saving link between the International Airport and the Auckland Central Business District.

Sika has been involved in major tunnel construction projects for over 100 years. Sika New Zealand's involvement has been to supply the specialty superplasticizer ViscoCrete® admixture for more than 24,000 pre-cast concrete segments (each weighing up to 10.2 tonnes), used to line what will in fact be twin tunnels – one for three lanes of North bound traffic, the other for three lanes of South bound traffic.

The $1.4b Waterview Connection is the largest road project ever undertaken in New Zealand. It involves construction of 4.8km of six-lane motorway to link State Highways 16 and 20 and therefore complete Auckland’s much needed Western Ring Route. Half of this new motorway link will be underground in Australasia’s largest road tunnel, being constructed using a custom-built tunnel boring machine (TBM) called Alice. With a cutting diameter of 14.4m, it is the 10th largest machine of its kind ever built.