It's hard to find the right epoxy resin for injecting overhead cracks in concrete. The resin needs to have a low viscosity for good penetration and exhibit good flexibility to withstand minor movement from shocks and vibration.
In early 1998, when a waterproofing contractor was awarded the contract to repair ceilings in primary wastewater storage tanks in Detroit's Jefferson Avenue Treatment Plant, his decision was easy - Prime Rez 1200 Low Mod LV. It is the injection resin specified by the City of Detroit Water and Sewerage Department.
About a year earlier, Detroit's Water and Sewerage Department had contracted with Mid-America Gunite to repair overhead cracks in the same facility. The repair was done in two sections. In one section they used Prime Rez 1200 Low Mod LV injection resin, and in the other, they used a competitive product. Core samples revealed that the Prime Rez 1200 had completely penetrated into the hairline fissures and fractures, while the other product had not.
Mike Blaska of B & D Associates is the Mt. Morris, Michigan Prime Resins dealer who supplied the material. He said engineers were so impressed by its penetration and flexibility that Prime Rez 1200 Low Mod LV is now the Detroit Water and Sewerage Department's choice for concrete ceiling crack injection.
