4.7 Article

Studies on the carboaluminate formation in limestone filler-blended cements

Journal

CEMENT AND CONCRETE RESEARCH
Volume 31, Issue 6, Pages 853-859

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-8846(01)00491-4

Keywords

blended cement; filler; hydration products; sulfoaluminate; X-ray diffraction

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Carboaluminates are hydration products of limestone-blended cements and they compete with monosulfoaluminate stability and ettringite transformation. In this paper a study about the hydration of pure C(3)A phase with CaCO3 in the presence or not of gypsum and in a calcium hydroxide solution is related to the hydration products of portland and limestone-blended cements. Results show the formation of monocarboaluminates in systems containing C(3)A and CaCO3 while the tricarboaluminate was not found. Calcium hydroxide intervenes in these systems to form a calcium hemicarboaluminate hydroxide. In limestone-blended cements, calcium monocarboaluminate is immediately detected after hydration bt gun and the transformation of monosulfoaluminate to monocarboaluminate occurs at 28 days while the conversion of ettringite to monosulfoaluminate is deferred. (C) 2001 Elsevier Science Ltd. All rights reserved.

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