Metakaolin as an Extender in South African Cement
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 4
Abstract
Metakaolin is a pozzolanic material obtained through thermal activation of kaolinite. It has several important advantages when used as an extender for Portland cement. This note describes the strength enhancement observed in mortars containing metakaolin additions between 10 and 30%. It was found that compressive strengths increase with increased curing times and depended strongly on the activation temperature used. Strength enhancements did not depend significantly on the concentration of metakaolin addition. Significant improvements in compressive strengths of cement mortars, up to 80% or more, was found in selected cases.
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Acknowledgments
Serina Kaolin is gratefully acknowledged for supplying the material used in this investigation. The writers also thank the National Research Foundation (NRF) for supplying financial assistance.
References
Curcio, F., Deangelis, B. A., and Pagliolico, S. (1998). “Metakaolin as a pozzolanic microfiller for high-performance mortars.” Cem. Concr. Res., 28(6), 803–809.
De Silva, P. S., and Glasser, F. P. (1992). “Pozzolanic activity of metakaolin.” Adv. Cem. Res., 4(16), 167–178.
ECC International. (1996). “Metastar: A new pozzolanic material for the cement and concrete industry.” Application Note APP 030C, Cornwall, U.K.
Frias, M., Sanchey de Rojas, M. I., and Cabrera, J. (2000). “The effect that the pozzolanic reaction of metakaolin has on the heat evolution in metakaolin-cement mortars.” Cem. Concr. Res., 30(2), 209–216.
Gruber, K. A., Ramlochan, T., Boddy, A., Hooten, R. D., and Thomas, M. D. A. (2001). “Increased concrete durability with high-reactivity metakaolin.” Cem. Concr. Compos., 23(6), 479–484.
Gruber, K. A., and Sarker, S. L. (1996). “Exploring the pozzolanic activity of high reactivity metakaolin.” World Cem., 27(2), 78–80.
Mackechnie, J. R. (1997). “Laboratory trials with Western Cape metakaolin.” Beton/Concrete, 87(1), 16–23.
Morat, M., and Comel, C. (1983). “Hydration reaction and hardening of calcined clays and related minerals: III Influence of calcinations process of kaolinite on mechanical strength of hardened metakaolinite.” Cem. Concr. Res., 13(5), 631–637.
Norrish, K., and Hutton, J. T. (1969). “An accurate spectrographic method for the analysis of a wide range of geological samples.” Geochim. Cosmochim. Acta, 33, 431–453.
Ramlochan, T., Thomas, M., and Gruber, K. A. (2000). “The effect of metakaolin on alkali-silica reaction in concrete.” Cem. Concr. Res., 30(3), 339–344.
Sabir, B. B., Wild, S., and Bai, J. (2001). “Metakaolin and calcined clays as pozzolans for concrete: A review.” Cem. Concr. Compos., 23(6), 441–454.
Serina, Kaolin. (2004). ⟨www.kaolin.co.za⟩ (Dec. 15, 2004).
South African Bureau of Standards (SABS). (1994). “Methods of testing cement.” EN 196:1, Pretoria, South Africa.
Vu, D. D., Stroeven, P., and Vui, V. B. (2001). “Strength and durability aspects of calcined kaolin-blended Portland cement mortar and concrete.” Cem. Concr. Compos., 23(6), 471–478.
Wild, S., Khatib, J. M., and Jones, A. (1996). “Relative strength, pozzolanic activity and cement hydration in superplasticised metakaolin concrete.” Cem. Concr. Res., 26(10), 1537–1544.
Zhang, M. H., and Malhotra, V. M. (1995). “Characteristics of a thermally activated alumino-silicate pozzolanic material and its use in concrete.” Cem. Concr. Res., 25(8), 1713–1725.
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© 2006 ASCE.
History
Received: Mar 30, 2004
Accepted: Aug 30, 2004
Published online: Aug 1, 2006
Published in print: Aug 2006
Notes
Note. Associate Editor: Chiara F. Ferraris
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