2007 Volume 56 Issue 8 Pages 742-747
In order to improve the durability of concrete structures under harsh chloride-laden environments the use of surface coating and cross sectional restoration methods has been increased. For these methods polymer cement mortar becomes of a primary repair material. Then interface phenomena between the polymer cement mortar and concrete as the substrate needs to be clarified with regard to chloride penetration. In this paper the results of electrical resistance tests and chloride migration tests have been provided. Interface resistance of repaired concretes has been studied by comparing electrical resistance obtained experimentally and by calculations using the ohm's law on a series circuit. It is found that the interface resistance is controlled by the type of polymer cement mortars, mix proportions of concrete and the ages. Increased interface resistance is verified by decreased flux in the chloride migration tests. For repaired concrete by cross sectional restoration, the interface resistance may be ignored where the resistance obtained by the experiment and calculation was equal.
