Microstructure and strength development of beta-dicalcium silicate pastes with and without admixtures

✍ Scribed by J.F. Young; H.-S. Tong

• Book ID: 102995693
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 767 KB
• Volume: 7
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(77)90044-8

✦ Synopsis

Microstructural development in hydrating be~-dicalcium silicate pastes was studied up to 188 days using scanning electron microscopy. The overall development is stmtlar to that observed previously for tricalcium silicate pastes, but some unusual features were observed and are described. The calcium silicate hydrate, Type I, is larger and better developed than that which is formed in tricalcium silicate pastes; and, moreover, calcium hydroxide also forms larger crystals. Tensile strength development follows the same relationship to gel-space ratio found for tricalcium silicate pastes, and is unaffected by the presence of admixtures. Chlortde and carbonate salts promote the formation of Type II calcium silicate hydrate.