Flexcrete's Cemprotec E942 anti-corrosion coating has been specified by Anglian Water to repair and protect structural steelwork in Lowestoft harbour tunnel in Suffolk.
Significant corrosion had taken place within the 1960s cast steel tunnel which contains service pipes and ducts carrying water and sewage under the harbour entrance.
First stage of preparation involved removing loose corrosion deposits by hand and then grit blasting the steel back to bright metal.
Cemprotec E942 reacts chemically with the substrate to accelerate the re-passivation of the steel, so minor corrosion appearing on the surface after blasting can be ignored. This allowed the entire blasting operation to be carried out before coating commenced.
A standard 2mm coating was put on in two applications and this is claimed to present a barrier to water penetration equivalent to 6m of structural concrete. This, combined with a high diffusion resistance to oxygen, carbon dioxide and chloride ions, ensures effective long term protection against the principal causes of corrosion and other aggressive agents.
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