Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 96, Issue 2, Pages 335-345Publisher
SPRINGER
DOI: 10.1007/s10973-007-8439-3
Keywords
calcium; aluminate cement; fly ash; microstructure; silica fume; TG-DTA; WAXS
Funding
- ESDRED EC project: 'Engineering Studies and Demonstration of repository Designs', the Spanish
- Region Poitou-Charentes [04/RPC-R-120]
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The most widely identified degradation process suffered by calcium aluminate cement (CAC) is the so-called conversion of hexagonal calcium aluminate hydrate to cubic form. This conversion is usually followed by an increase in porosity determined by the different densities of these hydrates and the subsequent loss of strength. Mixes of calcium aluminate cement (CAC) and silica fume (SF) or fly ash (FA) represent an interesting alternative for the stabilization of CAC hydrates, which might be attributed to a microstructure based mainly on aluminosilicates. This paper deals with the microstructure of cement pastes fabricated with mixtures CAC-SF and CAC-FA and its evolution over time. Thermal analysis (DTA/TG), X-ray diffraction (XRD) and mid-infrared spectroscopy (FTIR) have been used to assess the microstructure of these formulations.
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