What can be done to repair badly damaged bridge deck joints before resealing them?

The joint shoulders can be rebuilt with a mortar made of sand and low-viscosity epoxy resin. All loose material must first be broken free, the joint cleared of debris and the freshly exposed surface cleaned of dust by compressed air.

To build up the joint the epoxy mortar should be edged up against a backstop that has been coated with a bond breaker and has been wedged in the slot. (A steel plate or trowel held vertically against the edge may be used as an alternative, as shown in the picture.) The mortar is struck off flush along the top surface. The backstop is then removed, leaving a clean, even lip along both sides of the slot.