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Properties of high-alumina cement containing 2CaO-Al2O3-SiO2
This report presents the results of an investigation on the effects of SiO2 content in alumina cement. In particular, the formation of (2CaO)(Al2O3)(SiO2), the basic properties of the cement and the hardening time of the castables were studied. The investigation on the effects of the SiO2 content in alumina cement used as a binder for castables gave the following results. Scanning electron microscopy/energy-dispersive spectroscopy analysis and X-ray diffraction clarified that (2CaO)(Al2O3)(SiO2) was increased by increasing the SiO2 content in the alumina cement. The peak separation method showed that increasing the amount of (2CaO)(Al2O3)(SiO2) in the alumina cement made the vitrifying ratio high. Increasing the (2CaO)(Al2O3)(SiO2) in an alumina cement increases both the elution amount of Ca(2+)-ion and the hardening time of castables. It was confirmed by this investigation that the formation of (2CaO)(Al2O3)(SiO2), the increase in (2CaO)(Al2O3)(SiO2) and the lengthening of the hardening time was related to the increase of the SiO2 content as a constituent of an alumina cement. The workability values and the hardening time of the castable with cement containing more SiO2 were larger than those for castable containing less SiO2 due to the presence of (2CaO)(Al2O3)(SiO2). The strength of the castable with cement containing less SiO2 after curing and drying was higher than that of the cement with more SiO2. However, there was no difference between the crushing strengths of castables containing cement with high and low SiO2-contents after firing at 1400 deg C. The alumina cement presented in this report has suitable properties for use in the labour saving wet gunning method that has been recently popularized. Future work will be directed toward investigation of the combination of minerals and the optimization of powder properties.
Properties of high-alumina cement containing 2CaO-Al2O3-SiO2
This report presents the results of an investigation on the effects of SiO2 content in alumina cement. In particular, the formation of (2CaO)(Al2O3)(SiO2), the basic properties of the cement and the hardening time of the castables were studied. The investigation on the effects of the SiO2 content in alumina cement used as a binder for castables gave the following results. Scanning electron microscopy/energy-dispersive spectroscopy analysis and X-ray diffraction clarified that (2CaO)(Al2O3)(SiO2) was increased by increasing the SiO2 content in the alumina cement. The peak separation method showed that increasing the amount of (2CaO)(Al2O3)(SiO2) in the alumina cement made the vitrifying ratio high. Increasing the (2CaO)(Al2O3)(SiO2) in an alumina cement increases both the elution amount of Ca(2+)-ion and the hardening time of castables. It was confirmed by this investigation that the formation of (2CaO)(Al2O3)(SiO2), the increase in (2CaO)(Al2O3)(SiO2) and the lengthening of the hardening time was related to the increase of the SiO2 content as a constituent of an alumina cement. The workability values and the hardening time of the castable with cement containing more SiO2 were larger than those for castable containing less SiO2 due to the presence of (2CaO)(Al2O3)(SiO2). The strength of the castable with cement containing less SiO2 after curing and drying was higher than that of the cement with more SiO2. However, there was no difference between the crushing strengths of castables containing cement with high and low SiO2-contents after firing at 1400 deg C. The alumina cement presented in this report has suitable properties for use in the labour saving wet gunning method that has been recently popularized. Future work will be directed toward investigation of the combination of minerals and the optimization of powder properties.
Properties of high-alumina cement containing 2CaO-Al2O3-SiO2
Eigenschaften von (2CaO)(Al2O3)(SiO2)-haltigen Hochtonerdezementen
Sakai, H. (author) / Satou, M. (author) / Takata, M. (author) / Iwamoto, S. (author)
Taikabutsu Overseas ; 19 ; 48-51
1999
4 Seiten, 8 Bilder, 5 Tabellen, 5 Quellen
Article (Journal)
English
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