Retraction Notice to: The influence of Al2O3 nanoparticles on the properties of traditional concrete with ground granulated blastfurnace slag as binder

By the decision of the Editor-in-Chief, article (1) has been withdrawn from Issue 5 Volume 17 (2012) of the Cement Wapno Beton journal. The withdrawn article contains content borrowed without citation, e.g. from Jo et al. (2). The presented cement composition is identical to the cement composition presented in the work of Givi et al. (3). Also, some images taken from (2) were reused in other paper submitted at a similar time (4, 5) claiming, that they present different materials.We would like to apologize to the Readers of Cement Wapno Beton for this situation. We assure You that the Editorial Board makes every effort to avoid such situations. The authors did not respond to messages regarding the withdrawal of the article sent to them by the Editorial Office.