Effects of quartz particle size on hydrogarnet formation during autoclaving at 180°C in the CaO-Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf>-H<inf>2</inf>O system

Publication Type:
Journal Article
Citation:
Cement and Concrete Research, 1998, 28 (9), pp. 1309 - 1316
Issue Date:
1998-01-01
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The effects of quartz particle size on the nature of hydration products in unstirred, autoclaved metakaolin-lime-quartz slurries with Ca/(Al + Si) and Al/(Al + Si) ratios of 0.80 and 0.13 were investigated. While hydrogarnet invariably appeared before 11 Å tobermorite when using either fine or coarse quartz, its formation was more prominent in the presence of coarse quartz. The breakdown of hydrogarnet and the formation of 11 Å tobermorite were delayed in the presence of coarse quartz, suggesting that when using aluminous additives under autoclaving conditions, quartz fineness is a deciding factor. The amount of hydrogarnet formed during autoclaving followed by its breakdown is significant in relation to the formation of 11 Å tobermorite. © 1998 Elsevier Science Ltd.
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