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Hydrogarnet formation during autoclaving at 180 degree C in unstirred metakaolin-lime-quartz slurries
Autoclaved metakaolin-lime-quartz slurries with Ca/(Si+Al)composition of 0.8 and Al/(Si+Al) ratios between 0.03 and 0.38 were investigated. Hydrogarnet was always among the first phases formed and invariably appeared before 11 angstroms tobermorite. With increasing reaction time for Al/(Si+Al) ratios <=0.13, the amount of hydrogarnet decreased and finally disappeared while 11 angstroms tobermorite increased concurrently. For Al/(Si+Al) ratios >0.13, hydrogarnet coexisted with 11 angstroms tobermorite after 4 h and beyond. Thus, in the presence of aluminous additives, hydrogarnet formation appears to play a more significant role in relation to 11 angstroms tobermorite formation than was thought previously. Increasing addition of metakaolin retarded the lime-quartz reaction, while enhancing the initial C-S-H formation.
Hydrogarnet formation during autoclaving at 180 degree C in unstirred metakaolin-lime-quartz slurries
Autoclaved metakaolin-lime-quartz slurries with Ca/(Si+Al)composition of 0.8 and Al/(Si+Al) ratios between 0.03 and 0.38 were investigated. Hydrogarnet was always among the first phases formed and invariably appeared before 11 angstroms tobermorite. With increasing reaction time for Al/(Si+Al) ratios <=0.13, the amount of hydrogarnet decreased and finally disappeared while 11 angstroms tobermorite increased concurrently. For Al/(Si+Al) ratios >0.13, hydrogarnet coexisted with 11 angstroms tobermorite after 4 h and beyond. Thus, in the presence of aluminous additives, hydrogarnet formation appears to play a more significant role in relation to 11 angstroms tobermorite formation than was thought previously. Increasing addition of metakaolin retarded the lime-quartz reaction, while enhancing the initial C-S-H formation.
Hydrogarnet formation during autoclaving at 180 degree C in unstirred metakaolin-lime-quartz slurries
Klimesch, D.S. (author) / Ray, A. (author)
Cement and Concrete Research ; 28 ; 1109-1117
1998
9 Seiten, 12 Quellen
Article (Journal)
English
Kaolin , Kalk , Quarz , Granat , Aluminiumverbindung , Autoklav , Schlicker , Autoklavierung , Tobermorit
Hydrogarnet Formation During Autoclaving at 180C in Unstirred Metakaolin-Lime-Quartz Slurries
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