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Stainless steel dowels trialled for road repair

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NEW STAINLESS steel dowel bars are being inserted into failed joints in a concrete carriageway in Kent in the first full scale UK trial of an American road repair technique.

Contractor Nuttall is carrying out the repairs on the A20 Swanley Bypass in a five week operation.

Along the 3.6km length of the three lane bypass original dowel bars have corroded and failed at 49 of the road's 360 joints.

Without effective load transfer between sections the road will have a reduced working life, and surface irregularities will spoil ride comfort.

An American-developed concrete saw is cutting three slots half way into the 280mm thick concrete slabs at each failed slab.

New 40mm stainless steel bars 360mm long are inserted and the slots backfilled with a rapidhardening polymer-modified cementitious grout.

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