Ing. Jakub Hodul took part in an internship at the University of Malta, Faculty of the Built Environment, under the Erasmus + program. The training was focused mainly on research and development of polymer-cement mortars with different content of crystallization additive in order to increase their long-term durability and impermeability to aggressive media. In the framework of research work, the basic physico-mechanical properties were determined. With sub-samples, further research will take place at the AdMaS Center. In particular, it will be a study of microstructure. In the future, further cooperation with the University of Malta is expected, especially in the field of development and research, to increase the long-term durability of concrete, and also to use waste and secondary raw materials to improve environmental aspects.