Impact resistance of epoxy resin coating with waste mineral powders: a drop-weight testing approach

The paper presents the results of impact resistance tests of epoxy resin coatings modified with waste granite powders. The aim of the study was to determine the effect of the type and amount of powder on the mechanical resistance of the coatings, while reducing the amount of epoxy resin and hardener. The tests were carried out in accordance with the EN ISO 6272-1:2011 standard, using weights of 1 kg and 2 kg. Based on the observation of damage, an original classification of failures was introduced: type I (localized) and type II (extensive). The results showed that the use of granite powders significantly increases impact resistance compared to the reference system, with the fine fraction (G1) better improving resistance to localized damage, and the coarse fraction (G2) better limiting crack propagation under higher impact energy. The obtained results confirm the possibility of using mineral waste as fillers in epoxy resin systems, supporting the concept of a circular economy.