The Role of Temperature on Hydration of Binary System of Metakaolin/Portland Cement

Abstract:

The role of temperature of metakaolin/Portland cement binary system was studied by isothermal calorimetry. Sample with 50 % of metakaolin replacement were monitored at 30 °C, 40 °C, 50 °C and 60 °C. Structural and chemical characterization of hardened pastes was obtained by scanning electron and Raman microscopy. Paper deals with kinetics of main exothermal reactions during early hydration of the system. Activation energies were calculated for processes related to each exothermic peak. The nature of hydration products at different temperatures was revealed by microstructural studies.

• Periodical: Materials Science Forum (Volume 851)
• Pages: 51-56
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.851.51
• Online since: April 2016
• Authors: Martin Boháč, Radoslav Novotný, Jakub Tkacz, Miroslava Hajdúchová, Martin Palou, Theodor Staněk
• Keywords: Calorimetry, Cement, Metakaolin, Microstructure, Role of Temperature

References

[1] H.F.W. Taylor, P. Barret, P.W. Brown, D.D. Double, G. Frohnsdorff, V. Johansen, D. Ménétrier-Sorrentino, I. Odler, L.J. Parrott, J.M. Pommersheim, M. Regourd, J.F. Young, The hydration of tricalcium silicate, Mater. Struct. 17 (1984) 457–468.

DOI: 10.1007/bf02473986

[2] E.M. Gartner, J.M. Gaidis, Hydration mechanisms, I, in: J. Skalny (Ed. ), Materials Science of Concrete, Vol. 1, American Ceramic Society, Westerville, OH, (1989) 95–125.

[3] J.M. Gaidis, E.M. Gartner, Hydration mechanisms, II, in: J. Skalny, S. Mindess (Eds. ), Materials Science of Concrete, Vol. 2, American Ceramic Society, Westerville, OH, (1989) 9–39.

[4] E.M. Gartner, J.F. Young, D.A. Damidot, I. Jawed, Hydration of portland cement, in: J. Bensted, P. Barnes (Eds. ), Structure and Performance of Cements, 2nd Edition, Spon Press, New York, (2002) 57–113.

[5] M. Frías, M.I. Sánchez de Rojas, J. Cabrera, The effect that the pozzolanic reaction of metakaolin has on the heat evolution in metakaolin-cement mortars, Cem Concr Res. 30 (2000) 209-16.

DOI: 10.1016/s0008-8846(99)00231-8

[6] A. Nadeem, S.A. Memon, T.Y. Lo, Mechanical performance, durability, qualitative and quantitative analysis of microstructure of fly ash and metakaolin mortar at elevated temperatures, Constr Build Mater. 38 (2013) 338–47.

DOI: 10.1016/j.conbuildmat.2012.08.042

[7] W. Sha, G.B. Pereira, Differential scanning calorimetry study of ordinary Portland cement paste containing metakaolin and theoretical approach of metakaolin activity, Cem Concr Comp. 25 (2001) 455-61.

DOI: 10.1016/s0958-9465(00)00090-1

[8] M.S. Morsy, Effect of temperature on hydration kinetics and stability of hydration phases of metakaolin–lime sludge–silica fume system, Ceramics. 49 (2005) 225-9.

[9] K.L. Scrivener, P.L. Pratt, Microstructural studies of the hydration of C3A and C4AF independently and in cement paste, in: F.P. Glasser (Ed. ), Brit. Ceram. Proc. 35, Stoke-on-Trent, British Ceramic Society, (1984) 207–219.

[10] H.J.H. Brouwers, The work of Powers and Brownyard revisited: part 2, Cem Conr Res. 35 (2005) 1922-36.