To repair a damaged concrete bridge, the best product to use is Concrete Welder. The process is slightly different than we normally recommend. Because of the unique construction of concrete bridges, they are the one application where there is a need to cut and prepare the concrete.
To begin, cut a section around the affected concrete bridge repair area, spalled area, and expose any steel or rebar. Sandblast the steel or rebar until it is clean. Sweep or blow area so it is clean and dry. Note: If the expansion joint needs to be replaced, it should be filled according to standard procedure.
If the concrete bridge repair area is deeper than 2 inches, pre-fill section with special aggregate. Using Roklin’s Concrete Welder, carefully pour contents of bottle “a” into provided 5-gallon bucket then add treated sand. Next, shake bottle “b” thoroughly and pour into sand mixture. Mix with an egg-beater style pail mixer, using a drill. (In colder months or when there is little time for the repair, catalyst can be supplied as an additive to speed the reaction.)
When mixture is completely wet, pour Concrete Welder onto damaged area and use a trowel or lute to smooth material into cut section. When damage is sufficiently smooth, toss topping sand by hand over repaired area to create a uniform look and feel. The concrete bridge repair area can be ready for traffic in about an hour.