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

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Cement and Concrete Research

DOI:https://doi.org/10.1016/0008-8846(95)00091-P· OSTI ID:99589

Collepardi, M; Monosi, S; Piccioli, P ^[1]

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1. Ancona Univ. (Italy). Dept. of Materials Science

High alumina cement is particularly suitable for manufacturing sulphate resistant concretes and in particular cement mixes which are able resist the sear water aggression. High alumina cement paste, in the presence of silica fume, shows an increasing strength trend even at 20 C and 40 C, since this pozzolan causes the formation of gehlenite hydrate (C{sub 2}ASH{sub 8}) and therefore strongly reduces the transformation of hexagonal aluminate hydrates (CAH{sub 10}, C{sub 2}AH{sub 8}) into the cubic hydrate (C{sub 3}AH{sub 6}) which is responsible for the strength loss of high-alumina cement mixes at higher temperatures (>20 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.

• OSTI ID: 99589
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 5 Vol. 25; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
42 ENGINEERING
ALUMINATES
ALUMINIUM OXIDES
ASHES
CALCIUM COMPOUNDS
CONCRETES
CORROSION RESISTANCE
CORROSIVE EFFECTS
FLY ASH
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
SEAWATER
SULFATES
WASTE PRODUCT UTILIZATION