AUSTRALIAN URETHANE SYSTEMS
Asia Pacific Industrial Newsletter Vol. 1 2012
Sydney Harbour Bridge resurfaced
using Graco equipment
The Sydney Harbour Bridge is listed in the Guinness Book of Records as the world’s
widest long-span bridge. When it opened in 1932, 11,000 vehicles crossed the
bridge each day. Today that’s grown to more than 160,000 each day. Total length of
bridge is 1149 meters including approach spans.
After 80 years, the Sydney Harbour Bridge required essential waterproofing and
resurfacing work. This was the first time in the bridge’s history that the original
concrete deck had been stripped for essential maintenance. The purpose of the
resurfacing and waterproofing was to create a smoother, more durable road surface,
reduce road noise, reduce risk of corrosion and structural damage on the bridge
deck, and rejuvenate the bridge.
Waterproofing the bridge deck has minimized the need for future repairs. Three
Graco XP70 Plural-Component Sprayers and four Graco Reactor H-XP3 Hydraulic
Proportioners were used for adhesive and polyurethane spray. Everything was set
up on trucks including material, generators, compressors and Graco equipment.
The trucks travelled down one lane while spraying the adjacent lane. A three-layer
polyurethane waterproofing system was applied to the concrete deck of the north
and south approach spans. The first primer layer was applied using a power roller.
The polyurethane waterproofing layer and the final primer layer was applied by
A heated crumbed rubber bitumen was sprayed onto the concrete deck of the arch
span to provide a waterproofing seal. Aggregate was then spread over and rolled
into the spray seal. Excess aggregate was swept up and removed. After waterproofing
activities, the construction team applied the asphalt and made the pavement.
Essential bridge maintenance work was completed over the weekends of 13-16
and 20-23 January 2012. In spite of the rain, the construction team managed to
complete the waterproofing and resurfacing 10 hours ahead of schedule.
Graco Reactor H-XP3 Hydraulic Proportioner
Graco XP70 Plural-Component Sprayer
Australian Urethane Systems Pty Ltd
Concrete Remedial Services