Repair of concrete structure results in formation of at least two-component system, i.e. concrete overlay/concrete substrate or repair material/repaired concrete. The adhesion between overlays and concrete substrate is one of the most important factors that affects the reliability and durability of repair. Recently, achievement of maximum bond strength is basic recommendation for various types of repair joints. The requirement for high adhesion arises from the higher tolerance on non-compatibility of properties of the both materials; in such a case, internal stresses involved with setting and shrinkage of the given repair material are usually higher as well.

In this paper, necessity of above recommendation has been discussed with regards to: repair material type, strength of concrete substrate and environmental conditions of bond service. The criteria for the creation of desired bond strength in relation to tensile strength of concrete substrate has been formulated. The possibilities of creation to attempt higher level of adhesion as well as economical and technical limitations of the adhesion improvement have been discussed.

The presentation has been prepared in the framework of Warsaw University of Technology grant - grant No. 504 G 1084 2815

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