期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 25, 期 5, 页码 2275-2282出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2010.11.017
关键词
Kaolin; Calcinations; Metakaolin; Temperature; Hydration heat; Compressive strength; Durability
The use of calcined clay, in the form of metakaolin (MK), as a pozzolanic material for mortar and concrete has received considerable attention in recent years. The present paper describes the results of a research project initiated to study the calcination of local kaolin at various temperatures (650-950 degrees C) and durations (2,3 and 4 h) to produce MK with a high pozzolanic activity. The pozzolanic activity was assessed by 28-days compressive strength and hydration heat methods. The maximum identified activity was obtained at 850 degrees C for 3 h duration. An increase of both hydration heat and compressive strength was obtained when ordinary Portland cement was replaced by 10% MK. The use of ternary blended cement improves the early age and the long-term compressive strength. The durability was also enhanced as better acidic resistance was observed. (C) 2010 Elsevier Ltd. All rights reserved.
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