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Microstructure of Portland cement mortar amended by burnt kaolin sand

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Abstract

Two types of raw materials, original kaolin sand OKS I and OKS II were used for experiment. They were transformed (1 h at 650 °C with 10 °C/min temperature increase) to burnt kaolin sand (BKS I and BKS II) with pozzolanic properties. Contents of decisive mineral—metakaolinite—in BKSs are as follows: BKS I (fraction below 0.06 mm) 20%; BKS II (fraction below 0.06 mm) 36% and BKS II (fraction below 0.1 mm) 31% by mass. Mortars with blends of Portland cement (PC) and BKS were prepared announced as: MK I (0.06) with 5 and 10% cement substitution by metakaolinite; MK II (0.06) with 5 and 10% cement substitution by metakaolinite and MK II (0.1) with 5, 10, 15 and 20% cement substitution by metakaolinite. The reference mortar with 100% of PC was made for comparison. All mortars were adjusted on the constant workability 180 ± 5 mm flow. Besides significant increase in compressive strengths—the refinement of pore structure in mortars with BKS connected with decreases in permeability and Ca(OH)2 content were revealed. The above facts confirm pozzolanic reaction of BKS in contact with hydrated PC and indicate perceptiveness of BKS for the use in cement-based systems as a pozzolanic addition.

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Acknowledgements

The authors are thankful to the Slovak Grant Agency (project No. 2/0053/09) for the financial support of this work.

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Authors and Affiliations

  1. Institute of Construction and Architecture of Slovak Academy of Sciences, Dúbravská cesta 9, 845 03, Bratislava, Slovak Republic

    L’. Krajči, M. Kuliffayová & I. Janotka

  2. Department of Engineering, University of New Brunswick, Saint John, NB, E2L 4L5, Canada

    S. C. Moujmdar

  3. Building Testing and Research Institute, Studená 3, Bratislava, 821 04, Slovak Republic

    I. Janotka

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  1. L’. Krajči
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  2. S. C. Moujmdar
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  3. M. Kuliffayová
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  4. I. Janotka
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Correspondence to S. C. Moujmdar.

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Krajči, L., Moujmdar, S.C., Kuliffayová, M. et al. Microstructure of Portland cement mortar amended by burnt kaolin sand. J Therm Anal Calorim 100, 779–787 (2010). https://doi.org/10.1007/s10973-010-0718-8

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