Hostname: page-component-848d4c4894-mwx4w Total loading time: 0 Render date: 2024-06-30T22:03:23.751Z Has data issue: false hasContentIssue false
  • English
  • Français

Gypsum-Free Portland Cement Pastes of Low Water-to-Cement Rat10

Published online by Cambridge University Press:  21 February 2011

FrantiŠek ŠkvÁra
FrantiŠek ŠkvÁra*
Affiliation:
Institute of Chemical Technology, Department of Glass and Ceramics Technology 5, 16628 Prague 6, Czech Republic
Get access

Abstract

Gypsum-free portland cement is a low porosity hydraulic binder based on finely groundportland cement clinker with addition of synergetic system containing an anion-active surface active agent (usually a sulphonated polyelectrolyte) and an inorganic salt (usually sodium carbonate) for regulation of the hardening process. The properties of GF cement are different from ordinary portland cement; they display, for example, higher strength, better corrosion resistance and thermal stability. These positive differences arise from the different mineralogy and microstructure of the hydration products, for example the absence of portlandite crystals. The main component of the binder product in hardened GF cement pastes is C-S-H (mean C/S ratio 2.7, based on EDAX analysis) intergrown with very fine Ca(OH)2 and highly dispersed C-A-H phases (hexagonal and cubic). The absence of crystalline formations in the GF hardened pastes is responsible for highermechanical strength. In the Czech Republic, GF cement is produced in the cement works of CEVA Prachovice Inc. ( Holderbank group) and is used for special works in the building industry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 153
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Lukjanova, O.I., Segalova, E., Rebinder, P.A., “The influence of hydrophilic plasticizer additions on the properties of concentrated cement suspensions”, Koll. Zhurnal 19, 82 (1957).Google Scholar
2. Brunauer, S., Yudenfreund, Y., Skalny, J., and Odler, I. “Hardened portland cement pastes at low porosity VII, Summary”, Cem. Concr. Res. 3, 279 (1973).Google Scholar
3. Škáyra, F., Hrazdira, J., and Všetečka, T., “Method of milling the portland clinker for the production of gypsumless portland cements”, US Patent 5,125,976 (30 June 1991).Google Scholar
4. Škáyra, F., Ďurovec, P., Černovsky, B., Všetečka, T., Hrazdira, J., and Kadlec, Z., “Mixed gypsumless portland cement”, US Patent 5,076,851 (31 December 1991).Google Scholar
5. Škáyra, F., Kolář, K., Novotný, J., Zadak, Z., and Bažantová, Z.,“The cement for use at low temperatures” in Proc. 7th Intern. Congres on Chem. Cement, Paris 1980, Vol.111, p.V–57 Google Scholar
6. Škáyra, F., “The effect of the mineralogical composition of clinker on the properties of 7. gypsum-free portland cements”, Ceramics (Prague) 37, 181 (1993)Google Scholar
7. Škáyra, F., unpublished resultsGoogle Scholar
8. Špynova, L. G., Ostrovskij, O.L., and Sanickij, M.A.,“Concrete for winter conditions. Ed. skola, Visca. Lvov 1(1985).Google Scholar
9. Diamond, S., “Cement paste microstructure-an overview at several levels”, in Hydraulic Cement Pastes: Their Structure and Properties pp.2–20 (1976).Google Scholar
10. Macphee, D. E., Lachowski, E. E., Taylor, A. H., and Brown, T. J.,“Microstructural development in pore reduced cement (PRC)”, in Advanced Cementitious Systems: Mechanisms and Properties, Mat. Res. Soc. Proc. 245, Boston, MA, pp. 303–308 (1991).Google Scholar
11. Sarkar, S. L., Diatta, Y., and Aitcin, P.-C., “Microstructural study of aggregate-hydrated paste interface in very high strength river gravel concretes, in Bonding in Cementitious Composites. Mater.Res.Soc.Proc. 114, Boston, MA, pp. 111–116 (1988).Google Scholar
12. Xu, Z., Deng, Y., Wu, X., Tang, M. and Beaudoin, J.J.,“Influence of various hydraulic binders on performance of very low porosity cementitious systems”, Cem Concr. Res. 23, p.462 (1993)Google Scholar