Hydrothermal synthesis of hydrogarnet and tobermorite at 175 °C from kaolinite and metakaolinite in the CaO–Al2O3–SiO2–H2O system: A comparative study.

2.50
Hdl Handle:
http://hdl.handle.net/2436/48196
Title:
Hydrothermal synthesis of hydrogarnet and tobermorite at 175 °C from kaolinite and metakaolinite in the CaO–Al2O3–SiO2–H2O system: A comparative study.
Authors:
Rios, Carlos A.; Williams, Craig D.; Fullen, Michael A.
Abstract:
The hydrothermal synthesis of hydrogarnet and tobermorite from kaolinite and metakaolinite was examined at 175 °C for 24 h in the CaO–Al2O3–SiO2–H2O (CASH) system, which is important in cement science and especially in cement chemistry and is closely related to the pozzolanic reaction, the CaO-aggregate reaction and the glass fibre reinforcement of hardened cement. Starting mixtures were prepared with molar ratios Al/(Si + Al) = 0.10–0.13 and Ca/(Si + Al) = 1.00–7.00. The hydration products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transformed infrared spectroscopy, Magic Angle Spinning Nuclear Magnetic Resonance and thermogravimetric analysis in order to elucidate their mineral chemistry and microstructure. Results reveal that several poorly crystalline materials were formed, with un-reacted Ca(OH)2 appearing at shorter reaction times. Hydrogarnet always tended to form more rapidly than tobermorite. It was transformed into aluminium-substituted tobermorite with curing time. CaO is present in the further reaction with SiO2 forming calcium silicate hydrates, and released Al3+ ions were inserted into tobermorite.
Citation:
Applied Clay Science, 43(2): 228-237.
Publisher:
Amsterdam: Elsevier
Journal:
Applied Clay Science
Issue Date:
2009
URI:
http://hdl.handle.net/2436/48196
DOI:
10.1016/j.clay.2008.09.014
Additional Links:
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V8Y-4TKPV8D-1&_user=1644469&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000054077&_version=1&_urlVersion=0&_userid=1644469&md5=0315aab0d6fc82221be52ec1cce71a3d
Type:
Article
Language:
en
ISSN:
01691317
Appears in Collections:
Plant and Environmental Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorRios, Carlos A.-
dc.contributor.authorWilliams, Craig D.-
dc.contributor.authorFullen, Michael A.-
dc.date.accessioned2009-01-28T19:51:50Z-
dc.date.available2009-01-28T19:51:50Z-
dc.date.issued2009-
dc.identifier.citationApplied Clay Science, 43(2): 228-237.en
dc.identifier.issn01691317-
dc.identifier.doi10.1016/j.clay.2008.09.014-
dc.identifier.urihttp://hdl.handle.net/2436/48196-
dc.description.abstractThe hydrothermal synthesis of hydrogarnet and tobermorite from kaolinite and metakaolinite was examined at 175 °C for 24 h in the CaO–Al2O3–SiO2–H2O (CASH) system, which is important in cement science and especially in cement chemistry and is closely related to the pozzolanic reaction, the CaO-aggregate reaction and the glass fibre reinforcement of hardened cement. Starting mixtures were prepared with molar ratios Al/(Si + Al) = 0.10–0.13 and Ca/(Si + Al) = 1.00–7.00. The hydration products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transformed infrared spectroscopy, Magic Angle Spinning Nuclear Magnetic Resonance and thermogravimetric analysis in order to elucidate their mineral chemistry and microstructure. Results reveal that several poorly crystalline materials were formed, with un-reacted Ca(OH)2 appearing at shorter reaction times. Hydrogarnet always tended to form more rapidly than tobermorite. It was transformed into aluminium-substituted tobermorite with curing time. CaO is present in the further reaction with SiO2 forming calcium silicate hydrates, and released Al3+ ions were inserted into tobermorite.en
dc.language.isoenen
dc.publisherAmsterdam: Elsevieren
dc.relation.urlhttp://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V8Y-4TKPV8D-1&_user=1644469&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000054077&_version=1&_urlVersion=0&_userid=1644469&md5=0315aab0d6fc82221be52ec1cce71a3den
dc.subjecthydrothermal treatmenten
dc.subjectCementen
dc.subjectHydration productsen
dc.subjectHydrogarneten
dc.subjectTobermoriteen
dc.subjectKaoliniteen
dc.subjectMetakaoliniteen
dc.titleHydrothermal synthesis of hydrogarnet and tobermorite at 175 °C from kaolinite and metakaolinite in the CaO–Al2O3–SiO2–H2O system: A comparative study.en
dc.typeArticleen
dc.identifier.journalApplied Clay Scienceen
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