Tobermorite as the final product of β-C2S hydration

✍ Scribed by F.A. Shebl; F.M. Helmy

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 423 KB
• Volume: 15
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(85)90054-7

✦ Synopsis

The final hydrated product of B-C2S is identical to the natural mineral tobermorite 5CaO. 6SiO.5-7H20 and not the tobermorite-like phase 3CaO. 2SiOp.3HgO as stated earlier . The mechanism of the hydration react -ion is f~llo~ed up to 3.5 years. The suggested mechanism is based on the extraction of the total liberated lime (free, interlayer and"bound")from the hardened paste. The hydration reaction is divided into five stages. Both topochemical and solution reactions are used to explain the hydration reaction. The infrared spectra of the hydrated B-CoS resemble the spectra of the tobermorite-like phase but after a total extraction of the total released lime, the spectra are identical to those of the mineral tobermorite. A discussion of published earlier work according the new approach on the hydration mechanism is also given.