Influence of triethanolamine on the hydration characteristics of tricalcium silicate

The hydration characteristics of 3CaO.SiO[2] or beta2CaO.SiO[ 2] are studied by an addition of 0.0, 0.1, 0.5 or 1.0% triethanolamine. The amount of Ca(OH)[2] found at 1, 3, 7 or 28 days was in the order C[3]S + 0% TEA > C[3]S + 0.1% TEA > C[3]S + 0.5% TEA > C[3]S + 1.0% TEA, irrespective of whether lime was estimated by X-ray, DTA, TGA or chemical analysis. The rate of hydration, in terms of the disappearance of 3CaO.SiO[2], showed that hydration proceeded faster in the presence of TEA after 1 day. Additions of TEA increase the induction period, promote the formation of a C-S-H with higher CaO/SiO[2] ratio, increase the formation of non-crystalline Ca(OH)[2] and enhance the surface area of the hydrated silicate product.L'auteur \ue9tudie les caract\ue9ristiques d'hydratation du 3CaO. SiO[2] ou beta2CaO.SiO[2] par l'addition de 0.0%, 0.1%, 0.5% ou 1.0% de tri\ue9thanolamine (TEA). La quantit\ue9 de Ca(OH)[2] qui se forme en 1, 3, 7, ou 28 jours \ue9tait de l'ordre de C[3] S + 0% TEA > C[3]S + 0.1% TEA > C[3]S + 0.5% TEA > C[3]S + 1. 0% TEA, peu importe que la chaux ait \ue9t\ue9 \ue9valu\ue9e au moyen de rayons X, de l'analyse thermique diff\ue9rentielle, de l'analyse thermogravim\ue9trique ou de l'analyse chimique. Le taux d'hydratation, c'est-\ue0-dire de disparition du 3CaO.SiO[ 2], indique que l'hydratation se produit plus rapidement en pr\ue9sence du TEA apr\ue8s un jour. L'addition de TEA prolonge la p\ue9riode d'induction, favorise la formation d'un C-S-H ayant un taux plus \ue9lev\ue9 de CaO/SiO[2], augmente la formation de Ca(OH)[2] non cristallin et accro\ueet l'aire du produit de silicate hydrat\ue9.Peer reviewed: YesNRC publication: Ye