Lea Valley Road over TWA Lane
This job was to address spalled concrete and corroded rebar within the eastern abutment wall of the Lea Valley Bridge over the Thames Water Authority (TWA) Lane.
We broke out concrete (1,2) from around the corroded rebar to an extent over 30 metres. The existing rebar was cleaned up to bright steel. About 15 metres of rebar displayed excessive material loss. 18 metres of new 20mm rebar was installed and electrically bonded this to the existing rebar. 73 Sikashield Compact anodes were placed and wired into the existing rebar structure. Connectivity of anodes and new rebar to existing was checked and confirmed as being less than 1 Ohm. A slurry primer of OPC and Hydrated lime was applied to all surfaces and especially the rebar. Sika Monotop 412N was packed in around the rebar and the anodes carefully to leave no voids. This was built up layer by layer (3,4) and floated off to match the existing finish. It is expected that this installation of anodes will extend the life of the abutment by several years.
