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Thermal stability and decomposition mechanisms of ettringite at <120 degree C
Ettringite has been synthesised in phase-pure form and its decomposition and reformation studied as a function of water vapour pressure and temperature. Isobars at PH(2)O=6, 35, 75 and 400 mm were determined and combined with data on decomposition at the self-generated water vapour pressure achieved at (similar to)120 degree C. These data follow a well-defined curve although considerable hysteresis occurs in the temperatures for reformation, which are typically 15-20 degree C less than the corresponding decomposition temperature at each isobar. The dehydrated product is amorphous or nearly so to X-ray powder diffraction, but still gives an electron diffraction pattern: it has a water content that is fixed or variable within narrow limits, 10-13 H2O per ettringite formula unit. This product is termed meta-ettringite. Recommendations are also made for the upper safe service limits for ettringite-based cements.
Thermal stability and decomposition mechanisms of ettringite at <120 degree C
Ettringite has been synthesised in phase-pure form and its decomposition and reformation studied as a function of water vapour pressure and temperature. Isobars at PH(2)O=6, 35, 75 and 400 mm were determined and combined with data on decomposition at the self-generated water vapour pressure achieved at (similar to)120 degree C. These data follow a well-defined curve although considerable hysteresis occurs in the temperatures for reformation, which are typically 15-20 degree C less than the corresponding decomposition temperature at each isobar. The dehydrated product is amorphous or nearly so to X-ray powder diffraction, but still gives an electron diffraction pattern: it has a water content that is fixed or variable within narrow limits, 10-13 H2O per ettringite formula unit. This product is termed meta-ettringite. Recommendations are also made for the upper safe service limits for ettringite-based cements.
Thermal stability and decomposition mechanisms of ettringite at <120 degree C
Zhou, Q. (author) / Glasser, F.P. (author)
Cement and Concrete Research ; 31 ; 1333-1339
2001
7 Seiten, 13 Quellen
Article (Journal)
English
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