During the past seven years repairs to cracks in various types of structure have been carried out using epoxy and other synthetic resins. Cracks in floor slabs, walls, precast units, underwater structures, etc. were included in the defects for which remedies
were sought by using some type of injection process. In most cases it was desirable that complete structural restoration be achieved and for this reason epoxy resins with their excellent adhesion and stable volume characteristics together with their high tensile and compressive strengths, were selected.