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Porosity and specific surface area of Roman cement pastes / Renata Tišlova in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 950–956 Titre : Porosity and specific surface area of Roman cement pastes Type de document : texte imprimé Auteurs : Renata Tišlova, Auteur ; Antonina Kozłowska, Auteur ; Roman Kozłowski, Auteur Année de publication : 2009 Article en page(s) : pp. 950–956 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Mercury  porosimetry;  Pore  size  distribution;Surface  area;Cement  paste;  Roman  cement Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Mercury porosimetry, water vapour and nitrogen adsorption were used to follow the hydration of Roman cements — belite cements calcined at low temperature. Generally, unimodal distribution of pore sizes was observed, with the threshold pore width decreasing considerably with increasing curing time. An open porous structure with the threshold pore diameter between 0.2 and 0.8 μm and the specific surface area not exceeding 20 m2/g was produced at early ages when quick growth of the C–A–H phases is observed. The surface area reached up to 120 m2/g and the threshold pore width shifted to around 0.02 μm when the subsequent formation of C–S–H gel filled the larger pores. Both mercury porosimetry and water vapour adsorption were found to be capable of following the progress of hydration of the Roman cements with high reliability at least for a comparative evaluation of historic Roman cement mortars and repair materials used in restoration projects. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001501 [article] Porosity and specific surface area of Roman cement pastes [texte imprimé] / Renata Tišlova, Auteur ; Antonina Kozłowska, Auteur ; Roman Kozłowski, Auteur . - 2009 . - pp. 950–956. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 950–956 Mots-clés : Mercury  porosimetry;  Pore  size  distribution;Surface  area;Cement  paste;  Roman  cement Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Mercury porosimetry, water vapour and nitrogen adsorption were used to follow the hydration of Roman cements — belite cements calcined at low temperature. Generally, unimodal distribution of pore sizes was observed, with the threshold pore width decreasing considerably with increasing curing time. An open porous structure with the threshold pore diameter between 0.2 and 0.8 μm and the specific surface area not exceeding 20 m2/g was produced at early ages when quick growth of the C–A–H phases is observed. The surface area reached up to 120 m2/g and the threshold pore width shifted to around 0.02 μm when the subsequent formation of C–S–H gel filled the larger pores. Both mercury porosimetry and water vapour adsorption were found to be capable of following the progress of hydration of the Roman cements with high reliability at least for a comparative evaluation of historic Roman cement mortars and repair materials used in restoration projects. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001501