Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography / M.A.B. Promentilla in Cement and concrete research, Vol. 39 N° 6 (Juin 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. 548–557 Titre : Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography Type de document : texte imprimé Auteurs : M.A.B. Promentilla, Auteur ; T. Sugiyama, Auteur ; T. Hitomi, Auteur Année de publication : 2009 Article en page(s) : pp. 548–557 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Tortuosity  Microstructure  Cement paste  Synchrotron microtomography  Random walk simulation Résumé : Tortuosity, as being influenced by the 3D pore micro-geometry, is an important physical quantity to understand better the effect of pore structure on transport properties of cement-based materials. This study attempts to evaluate directly this pore structure-transport parameter from the microtomographic images at spatial resolution of 0.5 μm. This resolution, is by far, to our knowledge, the highest resolution reported for 3D non-invasive imaging of hardened cement pastes. The results show the feasibility of using synchrotron microtomography coupled with 3D image analysis and random walk simulation to measure the diffusion tortuosity that has a direct bearing on transport properties. The tortuosity associated with the percolating pore space seems to reflect the pore morphology that mainly controls the transport properties in young cement pastes; thus, explaining the rough agreement of the results with the computer model or experimental evidence. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000532 [article] Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography [texte imprimé] / M.A.B. Promentilla, Auteur ; T. Sugiyama, Auteur ; T. Hitomi, Auteur . - 2009 . - pp. 548–557. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. 548–557 Mots-clés : Tortuosity  Microstructure  Cement paste  Synchrotron microtomography  Random walk simulation Résumé : Tortuosity, as being influenced by the 3D pore micro-geometry, is an important physical quantity to understand better the effect of pore structure on transport properties of cement-based materials. This study attempts to evaluate directly this pore structure-transport parameter from the microtomographic images at spatial resolution of 0.5 μm. This resolution, is by far, to our knowledge, the highest resolution reported for 3D non-invasive imaging of hardened cement pastes. The results show the feasibility of using synchrotron microtomography coupled with 3D image analysis and random walk simulation to measure the diffusion tortuosity that has a direct bearing on transport properties. The tortuosity associated with the percolating pore space seems to reflect the pore morphology that mainly controls the transport properties in young cement pastes; thus, explaining the rough agreement of the results with the computer model or experimental evidence. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000532

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