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Water carry-on

The 50km Talla aqueduct, built in 1896, supplies more than half the clean water used in the city of Edinburgh. But over the years exposure to the environment caused severe corrosion to the concrete.

All materials used for repair work needed to have the necessary approvals for use with potable water and these were supplied by Flexcrete.

The asphalt originally used to protect the roof of the aqueduct was first removed by contractor Accrete. The defective concrete was then broken out and a 25mm layer of Monomix lightweight cementitious mortar was applied to the roofs, the concrete arches and the tunnel lining.

Voids and defects in the lining were then filled using Flexcrete's Monolevel 844SP. In areas where there was ingress of water Cementious Coating 851 was applied to waterproof and damp-proof the concrete. This is claimed to also protect the concrete from the effects of freeze/thaw cycles, carbon dioxide and other acid gases.

Finally a coat of Cemprotec Elastic advanced cementitious coating was brush-applied to the tunnel roof.

In all, more than 45t of Flexcrete materials were applied to protect a 1600m2 area. Repair of the Talla aqueduct won an award for Accrete at the International Concrete Repairs awards in the USA.

Flexcrete (01772) 255024

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