Influence of calcined kaolin on mortar properties |
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Authors: | Mohamed Said-Mansour El-Hadj Kadri Said Kenai Mohamed Ghrici Rachid Bennaceur |
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Affiliation: | 1. Geomaterials Laboratory, Civil Engineering Department, University of Blida, Algeria;2. Laboratory L2MGC, University of Cergy Pontoise, F9500, France;3. Civil Engineering Department, University of Chelef, Algeria |
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Abstract: | 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 °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 °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. |
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