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Marine Concrete Repairs - Colchester

July 29, 2019

Marine concrete repairs are being undertaken in Colchester for a client. The scope of works includes repairs to a concrete capping beam which has spalled in places and left exposed reinforcement which is corroding. There is also evidence of hollow sections which require breaking out and repairing.


The works are being carried out as part of a section 106 agreement to improve the condition of the river wall.


The scope of works is quite typical for Constructex and necessitates the use of specialist mortars in order for the repair to be effective.

On this project we are making use of Fosroc Renderoc GP and a thixotropic grout for smaller crack repairs.


It is essential the underlying reinforcement is exposed and cleaned off prior to effecting a repair. The underlying reinforcement must be treated with a zinc-rich primer. The concrete substrate is cleaned and treated with a specialist primer. Ideally chloride ingress test are performed prior to the repair taking place to better understand the extent of the problem.


BS EN 1504 provides approved codes of practice for structural concrete repairs and non-structural repairs. The concrete society also provides excellent guidance with its Technical Report #69 



All concrete repairs in the marine environment require careful planning and control to avoid contamination. Our supervisors are trained in these methods and we have rigorous quality processes that provide a framework for our work.




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