Project Case Study: Ben Lomond Bridge – Concrete Remedial and Coating Works
The Ben Lomond Bridge was constructed circa 1972 and it is a concrete box girder
bridge with three spans across the Bow Bowing Channel in Minto, NSW.
The approach spans are approximately 8.5 m in length and the central span was
approximately 29.2 m in length. Each approach span consists of nine box girder cells
and the central span consists of 10 posttensioned, precast beams, with a concrete
infill between beams. Supporting the ends of the approach spans and each end of
the central span of the bridge are two piers each with five rectangular reinforced
Scope of Works
The works were to remove the existing coating from the northern and southern edge
beams, and affected areas of the deck soffit (mid-section) by abrasive blasting
Replace the deck joints on the road and extend the scuppers below the deck soffit to
prevent water seepage to the substructure.
Also, as part of the works, carry out epoxy crack injection to repair the cracks in the
northern and southern edge beams and other areas that show signs of cracking.
Finally apply anti carbonation protective coating system (as per below) to the
blasted areas of the structure.
Protective Coating to be applied as follows:
Prime the area with one coat of Parchem Emer – Acrylic Sealer or equivalent.
Supply and spray two coats of Parchem Emer – Acrylic Low Sheen or equivalent.
Preparation of concrete surfaces
Finished view of concrete repairs and coating works