The effect of inorganic salts on tricalcium silicate hydration

✍ Scribed by Paul Wencil Brown; Caroline L. Harner; Edward J. Prosen

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 345 KB
• Volume: 16
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(86)90063-3

✦ Synopsis

Hydration of C3S in salt solutions having ions in common with its hydration products was investigated by calorimetry and aqueous phase analyses. Soluble calcium salts, which depress hydroxyl ion concentrations in solution by promoting Ca(OH) 2 precipitation, were observed to accelerate hydration. Acceleration did not occur prior to Ca(OH) 2 precipitation.

A saturated CaSO 4 solution, which delayed Ca(OH) 2 precipitation, was initially retarding but subsequently accelerated hydration as the hydroxyl ion concentration in solution decreased.

Of the solutions investigated, a 0.2M CaCI 2 solution was the most effective in depressing the hydroxyl ion concentration and caused the greatest acceleration.