Beach Road Motorway Over Bridge
PROJECT: Waterproof Concrete Deck
Owner: NZ Transport Agency
Principal Contractor: Fulton Hogan (Auckland Motorway Alliance)
Project Specification: Stirling Lloyd No. 2 Primer
Stirling Lloyd Two Coat Eliminator
Stirling Lloyd Bond Coat No. 3
Contract Applicator: Polymer Group Ltd – Bridge Coating Contract Manager
Completion Date: March 2017
The Stirling Lloyd Eliminator waterproofing membrane system was chosen to waterproof and protect the concrete deck of the Beach Road motorway over bridge.
The motorway over bridge is a 50 year old concrete structure. There was minimal concrete covering the steel reinforcing, the concrete surface was cracking and was only protected with a bitumen emulsion and asphalt.
The concrete bridge deck needed better waterproofing protection to prevent the steel reinforcing from corroding that would lead to spalling of the concrete.
The road surfacing was removed, the concrete deck prepared and primed and two waterproofing layers of Stirling Lloyd Eliminator waterproofing membrane applied to the concrete bridge deck. A bond coat was applied over the Stirling Lloyd Eliminator waterproofing membrane and then the asphalt wear layer was the reapplied.
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Milling of the existing SMA down to the concrete deck.
The concrete deck was then fine-milled using a bobcat, then diamond ground and captive shot blasted to remove the bitumen remnants.
The primer application and first layer of Eliminator (yellow) spray-applied.
After a one hour set time, the second coat of Eliminator (white) is spray-applied.