Faulty concrete affects major transport project
Quality control systems on the huge Waterview Connection project helped identify faulty concrete delivered by Firth.
A section of ramp four on the Great North Rd interchange will have to be repaired and some retaining walls, footpaths and crash barriers have also been affected.
The planned opening in early 2017 will not affected, however.
Firth, a subsidiary of Fletcher Building, delivered faulty concrete to commercial and residential projects late last month and then stopped production at one of its plants while the problem was sorted out.
The projects ranged from backyard paths and post holes to commercial projects.
Firth general manager Andrew Moss says clients were told the same day the issue was discovered. He says faulty measuring equipment is to blame and isolated to one production plant.
Each site where the faulty concrete was delivered has been visited by Firth to assess remedial action on a case-by-case basis. “In half the cases no action is needed, while concrete will be replaced where necessary,” Mr Moss says.
He says each site has a stringent quality control daily testing programme and it was through this that Firth discovered the substandard concrete.
The plant with the faulty testing equipment has since been reopened.