1 This paper was published in Journal of Cultural Heritage, 11 (2010), p. 404- 410. Original publication is avaible at: doi:10.1016/j.culher.2010.03.002 Pore structure of historic and repair Roman cement mortars to establish their compatibility Anna Klisińska-Kopacz a , Renata Tišlova b , Grzegorz Adamski a , Roman Kozłowski a* a Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland b Faculty of Restoration, University of Pardubice, Jiraškova 3, 57001 Litomyšl, The Czech Republic * Corresponding author. Tel: +48-12-6395119, Fax: +48-12-4251923, E-mail address: nckozlow@cyf-kr.edu.pl Keywords: Roman cement; historic mortars; pore structure; compatibility; mortar recipes; mercury porosimetry