Morphology and microstructure of hydrating portland cement and its constituents. III. Changes in the hydration of a mixture of C3S, C3A and gypsum with and without triethanolamine and calcium lignosulphonate present

Systematic sequential observations with the electron microscope were made of the morphological changes which occurred during the hydration of a paste mixture of C[3]S, C[ 3]A and gypsum. It was found that this system produced hydration products similar in nature to those produced by the monomineral systems with gypsum present. The two organic admixtures studied had some effect on changes in morphology and microstructure of the hydrating mixture, but they showed a pronounced influence on the rate of the hydration processes.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 compos\ue9e de C[3]S, C[3]A et de gypse. Ce syst\ue8me a des produits d'hydratation semblables par leur nature \ue0 ceux produits pas les syst\ue8mes monomin\ue9raux en pr\ue9sence de gypse. Les deux adjuvants organiques examin\ue9s ont un l\ue9ger effet sur la morphologie et la microstructure du m\ue9lange au cours de l'hydratation, mais ont une influence prononc\ue9e sur la dur\ue9e du processus d'hydratation.Peer reviewed: NoNRC publication: Ye