Influence of calcium gluconate with calcium chloride or glucose on the hydration of cements

✍ Scribed by N.B. Singh

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 331 KB
• Volume: 5
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(75)90055-1

✦ Synopsis

The effects of CaCl 2, calcium gluconate, mixture of CaCl 2 and calcium gluconate, glucose and mixture of glucose and calcium gluconate on the hydration of three different portland cements have been studied using isothermal microcalorimetry, x-ray diffraction, chemical analysis of the liquid phase and differential thermal analyses. The results indicated that (I) CaCl 2 accelerates whereas calcium gluconate retards the hydration of all the phases of the cement, (2) glucose accelerates the formation of ettringite whereas it retards the hydration of silicate phase, and (3) in the presence of mixture of admixtures the hydration process is more similar to that in the presence of calcium gluconate. It is believed that the action of one admixture in the presence of the other is a competitive process between the two. L'action des ajouts CaCl 2, gluconate de calcium, de leur m~lange, glucose et m~lange de glucose et de gluconate de calcium sur l'hydration de trios ciments portland a ~t6 6tudi~e a l'aide de la microcalorim6trie isotherme, la diffraction des rayons X, l'analyse thermique diff6rentielle et pour ce qui concerne la phase liquide il a 6t~ fait appel a l'analyse chimique. Les resultats indiquent que (1) Le chlorure de calcium acc~lere alors que le gluconate de calcium retarde l'hydration de toutes le phases du ciments. (2) Le glucose accelerate la formation des d'ettringite alors qu'll retarde la formation des silicates hydrates. (3) En presence de m~lange d'ajouts le processus d'hydration est similaire a celui en presence de gluconate seul. II faut eroire que l'action d'un ajout en presence d'un autre est un processus competetif entre les deux ajouts.