The protective coatings (cement filler and polymer resin) are used in renovation of the concrete surface in order to fill the holes, to reinforce the underlaying surface or to protect the concrete structure from the environmental ageing. Those coatings should have a good adherence to the concrete base.

Pull-off tests were made to investigate adhesion of those coatings to the concrete. Then the analysis of the concrete cracking was performed, by tearing off the roller. The influence of cement mortar and aggregates during pulling-off the roller was pointed out. The tests were carried out on concrete cubes in which natural aggregates were replaced by granulated foamed polystyrene. The results were compared with ordinary concrete.

This approach was developed in order to fix the proportional contribution of the cement mortar and the aggregates to the adhesion through the pull-off tests.

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