/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Materials and Structures, 1, 6, pp. 509-520, 1969-04-01 A model for hydrated portland cement paste as deduced from sorptionlength change and mechanical properties Feldman, R. F.; Sereda, P. J. Materiaux et constructions.
Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Mechanism of hydration of calcium oxide Ramachandran, V. S.; Sereda, P. J.; Feldman, R. F. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=20375070&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=20375070&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.
/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Society, 51, 6, pp. 337-340, 1968-09-01 Interrelation of hardness, modulus of elasticity, and porosity in various gypsum systems Soroka, I.; Sereda, P. J. Journal of the American CeramicA &A i.'p87tz,
/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Chemistry, 18, 4, pp. 111-1117Chemistry, 18, 4, pp. 111- , 1968 Mechanism of the carbonatation shrinkage of lime and hydrated cement Swenson, E. G.; Sereda, P. J. Carbonatation of hydrated lime compacts produces shrinkage and changes in ~ncchanical properties comparable with those found in similarly treated compacts of bottle-hydrated cerncnt and samples of hardened Portland cement paste. From experimental results obtained with the simpler limc system a mechanism for carbonatation shrinkage is proposed that postulates a through-solution reaction and induced cycles of wetting and drying. Experiments on compacts of bottle-hydrated cement show that carbonatation of the 'combined lime' is at least as rapid and extensive as the carbonatation of the 'free lime,' and that contrary to currenl opinion the former reaction results in even greater carbonalation shritikage. The mechanism for carbonatation shrinkage of this system is considered to be connected with dehydration and polyinerisation of the Iiydro~~s silica product of carbonatation. Journal of Applied
IfJEuence of CuC03 on the Hydration of 3CuO.AL203 25The tetrakaidekahedral model fills space efficiently, but i t does not fulfill the dihedral angle requirements of a sintering modcl, that is, its faces should form dihedral angles of 120°. The square-hexagon dihedral angle is about 125' while its hexagon-hexagon angle is about 110'. The tetrakaidekahcdron can, however, be slightly distorted so as to fulfill these requirements by introducing curved interparticle contact surfaccs.6 The relative contact areas between conducting grains and the path lengths through the conducting grains would not, however, be changed significantly by this distortion from those of the case treated.The low surface-to-volume ratio and the average dihedral snglc of the tetrakaidekahedron suggest its applicability to the analysis ol conduction paths and their statistics in other previously reported polyphase systems. The primary requirements which must be satisfied in the application of this modcl are that the grains be the same geometrically and that the effect of grain boundaries on the properties in question be negligible. V. ConclusionThe tetrakaidekahedral model provides an excellent fit to normalized electrical conductivity data from the system Zr02-Ca0 in thc range 0.22 to 0.39 mole fraction CaO.The model also explains the observed sharp reduction in conductivity at 0.39 mole fraction CaO (i.e. a t 0.25 volume fraction of the conductor phase). From 0.39 to 0.50 mole fraction CaO, the experimental conductivities are higher than predicted owing to the conductor distribution and a low specimen-to-grain height ratio. Acknowledgment D. Root for reading the manuscript and for helpful discussions.
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