SEALING THE SUBSTRATE

Although generally speaking more resistant to corrosion and other forms of degradation than steel piles or many other marine structures, over the course of time concrete may itself need additional protection.

There are a number of techniques available for doing so, one being the use of a physical barrier that seals the substrate.

One well proven example of such a technique - which is applicable to concrete, steel and timber used in the marine environment - is Sea Shield, from corrosion specialists Denso.

UK representatives Winn & Coales (Denso) Ltd says Sea Shield can protect concrete against oxygen and water, thus preventing corrosion and deterioration. The Series 100 Sea Shield has been used to encapsulate jetty piles and a wide range of other marine structures, as has the Series 200 Heavy Duty Sea Shield.

Company spokesman Chris Todd says Sea Shield provides long-term corrosion protection, can be applied to damp and immersed surfaces, withstands extreme weather conditions and is environmentally friendly.

Another player, Resiblock in the US, provides protection for concrete paving in ports and harbours, using specially developed sealants to prevent ingress of water, potential degradation of bedding sand, damage to underlying pavement layers, and reduction in the strength of subgrades used beneath paving.

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