MORTAR IN THE WATER
Another way to reinforce steel piling that has been subjected to ALWC is to use a reinforcing concrete. UK-based Flexcrete uses a wide range of purpose-designed marine mortars, sprayed mortars and unique cementitious coatings based on its advanced microsilica, polymer and fibre technology, to protect marine structures.
Flexcrete marine products can be installed between tides to damp substrates and will cure under water to form a resilient, durable finish. An exceptionally durable thin film cement-based system, E942 can be applied to surfaces to protect against the severe bacterial corrosion associated with ALWC and provides excellent resistance to chlorides present in seawater, oxygen and aggressive chemicals. It also forms an excellent barrier against the diffusion of chlorides and offers superb flexibility properties.
Cemprotec E942 is water-based and non-hazardous to apply, and is, says Flexcrete, a safer alternative to traditional application systems, such as solvent-based high-build coal tar epoxy, which are believed to cause health problems. "With excellent resistance to corrosion creep on damaged areas, E942 is extremely damp tolerant, and, unlike some other systems, it can be immersed around two hours after application, " Cook explains. Solvent free, E942 cures in 4-8 hours, and becomes durable in 24 hours, unlike some other conventional systems, which are susceptible to mechanical damage following application.
Based in Belgium, with facilities in Norway, the US and in Korea, Acotec uses a solvent-free and coal-tar free modified epoxy coating to tackle ALWC, applying the coating to the substrate from within a Dry Setting Installation or cofferdam. Managing director Bart Sonck told PS that Acotec's Humidur coating has a number of advantages, not least that it can cure underwater so that the cofferdam can be removed and a quay recommissioned as quickly as possible. The coating is impermeable to water - and thus isolates the bacteria from water and the atmosphere - and has been used at numerous ports and harbours.
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