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Hydration reaction and hardening of calcined clays and related minerals.:II. Influence of mineralogical properties of the raw-kaolinite on the reactivity of metakaolinite

Authors
Journal
Cement and Concrete Research
0008-8846
Publisher
Elsevier
Publication Date
Volume
13
Issue
4
Identifiers
DOI: 10.1016/0008-8846(83)90010-8
Disciplines
  • Earth Science

Abstract

Abstract Hydrates which form during the setting of calcium hydroxide-activated metakaolinite cements are essentially hydrated gehlenite C 2ASH 8 and CSH I with small quantities of C 4-AH 13. Investigations on metakaolinite obtained by calcination of three different raw-kaolinites show that the content of CSH I in the cement at 28 days, thus the formation rate of this hydrate, depends on the mineralogical characteristics of the raw-kaolinite (grain size, nature of impurities, and chiefly crystallization state). In another hand, for a given Water/Cement ratio, it is pointed out that the higher the CSH I content in the material after hardening, the higher the compressive strengths.

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