Effects of Reactive Magnesia on Microstructure and Frost Durability of Portland Cement–Based Binders
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 12
Abstract
The effects of portland cement (PC) replacement with magnesia (reactive magnesium-oxide) on properties of PC-based pastes, mortars, and concretes were investigated. The research included determination of mechanical properties and frost durability in addition to studies of the microstructure and microchemistry. The mortar and paste mixtures contained from 10–80 weight percent (wt%) replacement of PC by magnesia and had water to cementitious-binder ratios from 0.4–0.7, whereas concretes contained from 5–10 wt% magnesia and had a water to cementitious-binder ratio of 0.53. Replacement of PC by magnesia had adverse effects on the mechanical properties and frost durability. The magnesia reduced microcracking of the binder matrix in comparison with pastes containing only PC. The primary hydration product of magnesia was brucite in addition to regular hydration phases of PC. The amount of formed portlandite was increased. Magnesia caused densification of the microstructure but also increased the capillary porosity, resulting in lower frost-durability.
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References
Al-Amoudi, O. S. B. (2002a). “Attack on plain and blended cements exposed to aggressive sulfate environments.” Cement Concr. Compos., 24(3–4), 305–316.
Al-Amoudi, O. S. B. (2002b). “Durability of plain and blended cements in marine environments.” Adv. Concr. Res., 14(3), 89–100.
Bensted, J., and Barnes, P. (2002). Structure and performance of cements, 2nd Ed., Spon Press, London, 532–536.
Cwirzen, A., and Habermehl-Cwirzen, K. (2011a). “Reactive magnesium oxide modified cement–Microstructure and hydration products.” Proc., Symp. on High Performance Concrete (CD-ROM), New Zealand Concrete Society, Auckland, New Zealand.
Cwirzen, A., and Habermehl-Cwirzen, K. (2011b). “Reactive magnesium oxide as alternative secondary binder for portland cement.” Proc., Nordic Concr. Res., Nordic Concrete Federation, Denmark, 277–280.
Cwirzen, A., and Penttala, V. (2005). “Aggregate-cement paste transition zone properties affecting the salt-frost damage of high performance concretes.” Cement Concr. Res., 35(4), 671–679.
Deelman, J. C. (1999). “Low-temperature nucleation of magnesite and dolomite.” Neues Jahrbuch Mineralogie Monatshefte, 7(1), 289–302.
European Committee for Standardization (CEN). (2003). “Testing the freeze-thaw resistance of concrete internal structural damage.” CEN/TC 51 N772, Brussels, Belgium.
Fagerlund, G. (1975). “Critical moisture contents at freezing of porous materials.”, Swedisch Cement and Concrete Institute (CBI), Kew Gardens, NY, 1–17.
Harrison, J. (2003). “The properties of magnesia–Portland cement–Pozzolan blends.” Proc., Int. Seminar on Cement and Building Materials, National Council for Cement and Building Materials, New Delhi, India, 1–8.
Harrison, J. (2005). “Tec-cement reactions–Can hydraulic cements and geopolymers merge?” Proc. Geopolymer Institute, Geopolymer Institute, Saint Quentin, France, 1–15.
Hawlett, P. C. (1998). Lea’s chemistry of cement and concrete, Edward Arnold Press, London.
Lawry, J. (2005). “Thermal characterization of portland cement-magnesia blends.” Therm. Anal., 80(3), 637–641.
Li, Z., and Chau, C. K. (2008). “Reactivity and function of magnesium oxide in Sorel cement.” J. Mater. Civ. Eng., 20(3), 239–244.
Liska, M., Vandeperre, L. J., and Al-Tabba, A. (2008). “Influence of carbonation on the properties of reactive magnesia cement-based pressed masonry units.” Adv. Cement Res., 20(2), 53–64.
Litvan, G. G. (1972). “Phase transition of adsorbates: IV, mechanism of frost action in hardened cement paste.” J. Am. Ceram. Soc., 55(1), 38–42.
Mavroulidou, M., Murawski, M., and Hussain, A. H. (2011). “Properties of concrete with low energy demanding binders.” Proc., Int. Conf. on Environmental Science and Technology, IEEE, New York, 1218–1225.
Mitchell, L. D., and Margeson, J. C. (2006). “The effects of solvents on C-S-H as determined by thermal analysis.” J. Therm. Anal. Calor., 86(3), 591–594.
Powers, T. C. (1947). “A discussion of cement hydration in relation to the curing of concrete.” Proc., Annual Meeting of the Highway Research Board, Highway Research Board, Washington, DC, 178–188.
Scrivener, K. (1987). “Microstructural gradients in cement paste around aggregate particles.” Proc., Materials Research Society (MRS), Cambridge Univ. Press, Cambridge, UK, 114(1), 77.
Seehra, S. S., Gupta, S., and Kumar, S. (1993). “Rapid setting magnesium phosphate cement for quick repair of concrete pavements–Characterisation and durability aspects.” Cement Concr. Res., 23(2), 254–266.
Taylor, H. F. W. (1997). Cement chemistry, Reedwood Books, Trowbridge, UK.
Vandeperre, L. J., and Al-Tabba, A. (2007). “Accelerated carbonation of reactive MgO.” Adv. Cement Res., 19(2), 67–79.
Vandeperre, L. J., Liska, M., and Al-Tabba, A. (2008). “Microstructures of reactive magnesia cement blends.” Cement Concr. Compos., 30(8), 706–714.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 12 • December 2013
Pages: 1941 - 1950
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 4, 2012
Accepted: Dec 21, 2012
Published online: Dec 26, 2012
Discussion open until: May 26, 2013
Published in print: Dec 1, 2013
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