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Wastewater treatment infrastructure - structural asset surveys
Initial circumferential shrinkage of this cylindrical tank is now evident as stained cracks at reinforcement locations.
Andrew Sadleir was the specialist adviser on a team inspecting six wastewater treatment works, and principal author of the comprehensive report for the Client, a PFI consortium, led by a major UK/European contractor.
The detailed condition report also included costed remedial works and maintenance specifications.
Insufficient cover to reinforcement warns of possible widespread future problems in this tank wall, while adjacent poorly-executed column repairs are already failing.
Sadleir's experience in concrete repair contracting and materials consultancy informed the pragmatic approach adopted in the study, for which detailed results were delivered against a tight commercial deadline.
In this case, a reasonably good - and no doubt expensive - repair has been applied to a defective substrate, which exhibits classic signs of frost damage and poor quality mix.
The Operator's preliminary classification of structural condition was revised, taking into account the realistic ‘repairability’ of each structure.
Attention could thus be focussed on specifying remedial solutions for the high-value structures, while proposing low-cost interim measures for those clearly in need of wholesale renewal.