Influence of sea water solution on mortar containing calcium carbonate

Normal Portland cement mortar discs containing precipitated or ground limestone at dosages of 0, 2.5, 5 and 15% were made at water/cement ratios of 0.42 or 0.60. They were hydrated in lime water or sea water solution for periods up to 1 year. The length and modulus of elasticity changes were monitored periodically. Some mortars containing CaCO3 exhibited more than three times the expansion of the reference in sea water. The expansions were greater in samples containing fine CaCO3. The modulus of elasticity was especially low for samples containing precipitated CaCO3 and exposed to sea water.Des disques de mortier de ciment portland ordinaire contenant de la pierre \ue0 chaux moulue ou pr\ue9cipit\ue9e \ue0 des dosages de 0, de 2,5, de 5 et de 15 % ont \ue9t\ue9 fabriqu\ue9s \ue0 des rapports eau de g\ue2chage/ciment de 0,42 ou de 0,60. On les a hydrat\ue9s dans une solution d?eau de chaux ou d?eau de mer pendant des p\ue9riodes allant jusqu?\ue0 un (1) an. Les changements de longueur et de module d?\ue9lasticit\ue9 ont fait l?objet d?une surveillance p\ue9riodique. Certains mortiers contenant du CaCO3 ont pr\ue9sent\ue9 plus de trois (3) fois la valeur de dilatation de l?\ue9chantillon-t\ue9moin dans l?eau de mer. Les valeurs de dilatation \ue9taient plus \ue9lev\ue9es dans les \ue9prouvettes contenant du CaCO3 fin. Le module d?\ue9lasticit\ue9 \ue9tait particuli\ue8rement faible dans le cas des \ue9prouvettes contenant du CaCO3 pr\ue9cipit\ue9 et expos\ue9es \ue0 l?eau de mer.Peer reviewed: YesNRC publication: Ye