ABSTRACT
The durability of repaired concrete structures and their useful service life depend on many factors. One of the critical factors is the achievement of compatibility in such a composite system. As a prerequisite for meeting the repair service life objectives, the compatibility/incompatibility issues should be analyzed and adequately addresses at the design stage of the project. Despite the number of publications on durability and service life of repaired concrete structures, fundamental discussion and guidance on compatibility issues are lacking. The opinions and recommendations issued on the subject are in some cases confusing, misleading or incorrect, regrettably leading to fallacies about compatibility in the practicing community.
