Remediation of concrete using cathodic protection
An investigation by The Times found that in April 2019, 4,000 of around 9,000 bridges and large culverts on England’s motorways or A-roads showed evidence of defects or damage that may significantly affect their capacity.
There’s a huge cost involved in maintaining these structures with National Highways (NH) having spent a mammoth £4.5 billion operating, maintaining and improving its main road networks in 2019-2020 and allocating £0.3 billion for maintenance and repairs.
Over the next five years NH intends to spend £1.5bn on structural maintenance, £200M more than in the previous five-years. Therefore, any reductions in the frequency of maintenance of concrete structures will play an important role in cost saving.
With concrete structures at constant risk of attack from water and salt ingress, deterioration can occur quickly yet take several years for the effects of corroding reinforcement to appear.
When specifying products used in repairs where cathodic protection is being used, resistivity is a very important characteristic to take into account.