Morphology and microstructure of hydrating portland cement and its constituents. V. Changes in hydration of portland cement with and without the presence of triethanolamine and calcium lignosulphonate

Systematic sequential observations with the electron microscope were made of the morphological changes that occurred during the hydration of normal portland cement paste. The specific effect of each of two admixtures, triethanolamine and calcium lignosulphonate, was studied. The hydration products observed were clearly the same as those noted in the pastes of pure minerals or mixtures of these. The morphological changes that occurred appeared to be the same, and the rate of change effected by the presence of an organic admixture was found to be very similar.Des observations au microscope \ue9lectronique ont \ue9t\ue9 faites en s\ue9quence syst\ue9matique pour observer les changements morphologiques qui prennent place au cours de l'hydratation d'une p\ue2te de ciment portland ordinaire. Les effets sp\ue9cifiques de deux adjuvants, tri\ue9thanolamine et du lignosulfate de calcium ont \ue9t\ue9 \ue9tudi\ue9s. Les produits d'hydratation observ\ue9s \ue9taient nettement les m\ueames que ceux observ\ue9s dans les p\ue2tes de min\ue9raux purs ou des m\ue9langes de ceux-ci. Les changements morphologiques qui ont pris place sont apparus comme \ue9tant les m\ueames et la rapidit\ue9 des changements en pr\ue9sence d'adjuvants organiques a paru tr\ue8s similaire.Peer reviewed: NoNRC publication: Ye