Concrete water tanks resist chemical erosion


Around 24 tonnes of materials have been provided by concrete repair manufacturer Flexcrete Technologies Limited for a refurbishment project at Ashford Water Treatment Works (WTW) near Cannington in Somerset.

Flexcrete worked alongside specialist coatings system contractor Ultimate Coatings on the project. The concrete water tanks at Ashford WTW had deteriorated over time due to chemical attack from the treatment process. The reinforced concrete substrate was showing extensive signs of erosion, resulting in 20mm losses of concrete in some areas. A well proven concrete repair and protection solution was sought and Flexcrete and Ultimate Coatings collaborated to provide a system designed to last at least 20 years before first maintenance would be required.
All areas were first high pressure jet washed to remove the weak concrete before rendering. The whole surface was then overcoated with two 1mm spray-applied coats of Flexcrete Cementitious Coating 851. A highly advanced, two-component waterborne cementitious modified polymer coating, 851 provides an effective barrier against the effects of aggressive acid gases, moisture and chlorides. It forms a hard, highly alkaline coating for the protection and structural waterproofing of concrete, resisting positive and negative pressure under a 100-metre head, and is approved under Regulation 31(4)(a) for use in contact with drinking water. It is also CE marked in accordance with BS EN 1504 Part 2, the pan European standard for concrete repair, and is approved by the British Board of Agrément (BBA).


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