The formation of ettringite at elevated temperature

✍ Scribed by E. Grusczscinski; P.W. Brown; J.V. Bothe Jr.

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 580 KB
• Volume: 23
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(93)90052-b

✦ Synopsis

The formation of ettringite was investigated by isothermal calorimetry over the range of temperature from 50 to 70°C. Ettringite was formed using three sources of alumina: tricalcium aluminate, high alumina cement and calcium aluminate sulfate. In accord with a diffusionally controlled reaction mechanism, the kinetics of ettringite formation exhibit minimal temperature dependence over this range. C4A3~ and HAC evolve comparable amounts of heat in ettringite formation while the heat evolved when the alumina-containing reactant is C3A is significantly higher.