A hot substrate results in premature jelling of the resin with sequential loss of penetration. During extremely hot weather an open bridge deck may exceed temperatures as high as 140 Degrees F. Special precautions are necessary before injection work can be done in such weather. The precaution may be shading the bridge, and water cooling. Always check substrate temperature. The injection machine and its hoses require isolation from extremes of temperature.
Epoxy injection undertaken during cold weather also requires special precautions.
Epoxy injection machines should be equipped with silicone rubber strip heaters on the resin tanks, heat tapes on the hoses and a heater control element. Turn on the heater control elements, when the substrate or ambient temperature is below 70 Degrees F. Preheat the resin tanks for at least one hour before injection begins, longer for colder temperatures. When doing injection work in freezing conditions, determining if there is ice present in the crack is critical. Determining if a cracks inner surfaces are ice coated, is equally important. When injecting under these conditions, the resin will not bond to the substrate and no structural rebonding will result.