Monitoring of Kinetics of Pozzolanic Reaction

Abstract:

The pozzolanic additions are widely used as concrete component for numerous technical, economic and environmental reasons. Obviously the hydration process in a pozzolana containing system differs from hydration of Ordinary Portland Cement (OPC) what is indicated macroscopically by slower increase of strength and lower hydration heat. This paper aims to study pozzolanic reaction from perspective of chemical kinetics. From this point of view pozzolanic reaction and carbonation are two parallel reactions which are competing for portlandite (Ca (OH)₂). The rate of each of these two reactions is characterized by rate constant and order of reaction. The system under study was 1:1 mixture lime – ceramic powder. The course of reaction was primarily studied by thermogravimetry which results were further subjected to kinetic analysis. MAS NMR spectroscopy was used for study of structural changes taking place in material in the course of pozzolanic reaction.

• Periodical: Key Engineering Materials (Volume 722)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.722.126
• Online since: December 2016
• Authors: Monika Čáchová, Lenka Scheinherrová, Libor Kobera, Martina Urbanová, Jiří Brus, Martin Keppert*
• Keywords: Chemical Kinetics, NMR MAS Spectroscopy, Pozzolanic Reaction, Reaction Mechanism, Thermal Analysis

References

[1] F. Izzo, A. Arizzi, P. Cappelletti, G. Cultrone, A. De Bonis, C. Germinario, S.F. Graziano, C. Grifa, V. Guarino, M. Mercurio, V. Morra, A. Langella, The art of building in the Roman period (89 B.C. – 79 A.D. ): Mortars, plasters and mosaic floors from ancient Stabiae (Naples, Italy), Con. Build. Mat. 117 (2016).

DOI: 10.1016/j.conbuildmat.2016.04.101

[2] C. Nunes, Z. Slizkova, Freezing and thawing resistance of aerial lime mortar with metakaolin and a traditional water-repellent admixture, Con. Build. Mat. 114 (2016) 896–905.

DOI: 10.1016/j.conbuildmat.2016.04.029

[3] E. Vejmelková, D. Koňáková, T. Kulovaná, M. Keppert, J. Žumár, P. Rovnaníková, Z. Keršner, M. Sedlmajer, R. Černý, Engineering properties of concrete containing natural zeolite as supplementary cementitious material: Strength, toughness, durability, and hygrothermal performance, Cem. Conc. Comp. 55 (2015).

DOI: 10.1016/j.cemconcomp.2014.09.013

[4] O. Holčapek, P. Reiterman, P. Konvalinka, Fracture characteristics of refractory composites containing metakaolin and ceramic fibers. Adv. Mech. Eng. 7 (2015) Art. Nr. 1687814015573619.

DOI: 10.1177/1687814015573619

[5] M. Ghrici, S. Kenai, M. Said-Mansour, Mechanical properties and durability of mortar and concrete containing natural pozzolana and limestone blended cements, Cem. Conc. Comp. 29 (2007) 542–549.

DOI: 10.1016/j.cemconcomp.2007.04.009

[6] D. Kastis, G. Kakali, S. Tsivilis, M.G. Stamatakis, Properties and hydration of blended cements with calcareous diatomite, Cem. Conc. Res. 36 (2006) 1821–1826.

DOI: 10.1016/j.cemconres.2006.05.005

[7] D.L. Carroll, T.F. Kemp, T.J. Bastow, M.E. Smith, Solid-state NMR characterisation of the thermal transformation of a Hungarian white illite, Solid State Nucl. Magn. Reson. 28 (2005) 31-43.

DOI: 10.1016/j.ssnmr.2005.04.001

[8] M.D. Andersen, H.J. Jakobsen, J. Skibsted, Incorporation of aluminum in the calcium silicate hydrate (C-S-H) of hydrated Portland cements: a high-field 27Al and 29Si MAS NMR investigation, Inorg. Chem. 42 (2003) 2280-22877.

DOI: 10.1021/ic020607b

[9] K.J.D. Mackenzie, M.E. Smith, Multinuclear solid-state NMR of inorganic materials, Pergamon, London, (2002).

[10] R. Kondo, K. Lee, M. Diamon, Kinetics and mechanism of hydrothermal reaction in lime-quartz-water system, J. Ceram. Soc. Japan 84 (1976) 573-578.

DOI: 10.2109/jcersj1950.84.975_573

[11] C. Shi, R.L. Day, Pozzolanic reaction in the presence of chemical activators. Part I. Reaction kinetics, Cem. Conc. Res. 30 (2000) 51–58.