Development of Fly Ash Based Geopolymer As Anti Erosion Coating

Rapid development of marine resources increasingly demands the huge range
of concrete coastal structures and offshore structures. However, the concrete exposed
in rigorous marine environment is readily damaged by the erosive ocean-atmosphere
and seawater. Besides, erosion also happens because of acidic environment
especially from sewage and wastewater chemical treatment system. Several types of
coatings such as acrylic, polyurethane, epoxy and others now have been tried as
surface protection materials to inhibit the intrusion of corrosive and erosive ions.
However, organic coating usually covers the concrete surface by physical absorption
that makes it caduceus. The durability of thin coatings is also doubtful. The use of
inorganic polymer coatings to substitute organic coatings seems to be an alternative
way of improving the durability of marine concrete structures. The alternative
material which is geopolymer has been introduced to the concrete that is more
environmental friendly and saves cost. It is also known as inorganic polymer or
alkali activated binder has gained worldwide interest and its high anticorrosion
makes it a novel coating material. This development to the composite has been
investigated widely over the past 50 years. By using the fly ash that contains high
aluminosilicate and calcium to produce the geopolymer, the project will investigate
anddetermine the best formula for geopolymer as anti erosion coating. Moreover, fly
ash as has advantages over metakaolin in terms of lower cost as it is a waste from
coal and easy to produce geopolymer. The best formula will be use to produce
geopolymer and coat the concretes. The concretes that coat with fly ash based
geopolymer will go through erosion evaluation to prove that the coating is effective
anti erosion coating under acidic environment and rigorous marine environment.