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Porosity and specific surface area of Roman cement pastes
AbstractMercury 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 0.8μm and the specific surface area not exceeding 20m2/g was produced at early ages when quick growth of the C–A–H phases is observed. The surface area reached up to 120m2/g and the threshold pore width shifted to around 0.02μm 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.
Porosity and specific surface area of Roman cement pastes
AbstractMercury 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 0.8μm and the specific surface area not exceeding 20m2/g was produced at early ages when quick growth of the C–A–H phases is observed. The surface area reached up to 120m2/g and the threshold pore width shifted to around 0.02μm 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.
Porosity and specific surface area of Roman cement pastes
Tišlova, Renata (author) / Kozłowska, Antonina (author) / Kozłowski, Roman (author) / Hughes, David (author)
Cement and Concrete Research ; 39 ; 950-956
2009-06-18
7 pages
Article (Journal)
Electronic Resource
English
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