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The influence of pozzolanic materials on the mechanical stability of aluminous cement

✍ Scribed by M. Collepardi; S. Monosi; P. Piccioli

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 482 KB
Volume: 25
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(95)00091-p

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✦ Synopsis

High alumina cement paste, in the presence of silica fume, shows an increasing strength trend even at 20°C and 4O"C, since this pouolan causes the formation of gehlenite hydrate (C2ASHS) and therefore strongly reduces the transformation of hexagonal aluminate hydrates (CAHlg, C2AHS) into the cubic hydrate (QAHS) which is responsible for the strength loss of high-alumina cement mixes at higher temperatures (>2O"C). On the contrary, fly ash is not suitable for reducing the transformation of hexagonal hydrates into the cubic phase. Consequently, the strength at 20°C and 40°C of the fly ash-high alumina cement mixes decrease as well as the high alumina cement pastes in the absence of pozzolan.

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