Influence of Slag as Additive on Compressive Strength of Fly Ash-Based Geopolymer
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 6
Abstract
Slag was utilized as an additive for fly ash-based geopolymers in this study. It was found that the incorporation of slag could significantly increase the compressive strength of the geopolymer. The compressive strength of geopolymer with 4.0% slag reached 50 and when cured for at 30 and , respectively. The mechanism of slag as additive on the enhancement of compressive strength of geopolymer was investigated using X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and mercury intrusion porosimetry (MIP). The XRD and FTIR results showed that the addition of slag could generate more amorphous products and accelerate the reaction rate of raw materials. From XPS results, the decrease of binding energy and a broadening of peaks were observed for , , and elements due to the provided by slag. The decrease in binding energy was more favorable to zeolite formation. The results of MIP suggested that the 4% slag addition significantly influenced pore structure of geopolymer. A refinement of pore size was exhibited after 4% slag addition, especially for specimens being cured at . For these reasons, the compressive strength of geopolymer made with 4% slag addition was greatly improved.
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Acknowledgments
This research is supported by the project of HIA03/04.EG01 at HKUST.
References
Bakharev, T. (2005). “Geopolymeric materials prepared using Class F fly ash and elevated temperature curing.” Cem. Concr. Res., 35(6), 1224–1232.
Barr, T. L., Seal, S., He, H., and Klinowski, K. (1995). “X-ray photoelectron spectroscopic studies of kaolinite and montmorillonite.” Vacuum, 46(12), 1391–1395.
Barr, T. L., Seal, S., Wozniak, K., and Klinowski, J. (1997). “ESCA studies of the coordination state of aluminum in oxide environment.” J. Chem. Soc., Faraday Trans., 93(1), 181–186.
Black, L., Stumm, A., Garbev, K., Stemmermann, P., Hallam, K. R., and Geoffrey, C. A. (2005). “X-ray photoelectron spectroscopy of aluminum-substituted tobermorite.” Cem. Concr. Res., 35(1), 51–55.
Davidovits, J. (1999). “Chemistry of geopolymeric systems, terminology.” Proc., Geopolymer’99, Geopolymer Institute, Saint-Quentin, France, 9–39.
Fernández-Jiménez, A., and Palomo, A. (2003). “Characterisation of fly ashes. Potential reactivity as alkaline cements.” Fuel, 82(18), 2259–2265.
Fletcher, R. A., MacKenzie, K. J. D., Nicholson, C. L., and Shimada, S. (2005). “The composition range of alumino-silicate geopolymers.” J. Eur. Ceram. Soc., 25(9), 1471–1477.
Glukhovsky, V. D., Rostovskaja, G. S., and Rumyna, G. V. (1980). “High strength slag-alkaline cements.” Proc., 7th Int. Conf. on Chemical Cement Communication, Paris, Vol. 3, 164–168.
Hardjito, D., Wallah, S. E., Sumajouw, D. M. J., and Rangan, B. V. (2004). “On the development of fly ash-based geopolymer concrete.” ACI Mater. J., 101(6), 467–472.
Lee, W. K. W., and Van Deventer, J. S. J. (2002). “Structural reorganisation of class F fly ash in alkaline silicate solutions.” Colloids Surf., A, 211(1), 49–66.
Nefedov, V. I. (1988). X-ray photoelectron spectroscopy of solid surfaces, N. G. Shartse, translator, Alden, Oxford.
Palomo, A., Alonso, S., Fernández-Jiménez, A., Sobrados, I., and Sanz, J. (2004). “Alkaline activation of fly ashes: A NMR study of the reaction products.” J. Am. Ceram. Soc., 87(6), 1141–1145.
Palomo, A., Blanco-Varela, M. T., Granizo, M. L., Puertas, F., Vazquez, T., and Grutzeck, M. W. (1999a). “Chemical stability of cementitious materials based on metakaolin.” Cem. Concr. Res., 29(7), 997–1004.
Palomo, A., Grutzeck, M. W., and Blanco, M. T. (1999b). “Alkali-activated fly ashes: A cement for the future.” Cem. Concr. Res., 29(8), 1323–1329.
Phair, J. W., Van Deventer, J. S. J., and Smoth, J. D. (2000). “Mechanism of polysialation in the incorporation of zirconia into Fly ash-based geopolymer.” Ind. Eng. Chem. Res., 39(8), 2925–2934.
Shigemoto, N., Sugiyama, S., Hayashi, H., and Miyaura, K. (1995). “Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS, NMR, and XPS.” J. Mater. Sci., 30(22), 5777–5783.
Swanepoel, J. C., and Strydom, C. A. (2002). “Utilisation of fly ash in a geopolymeric material.” Appl. Geochem., 17(8), 1143–1148.
Van Jaarsveld, J. G. S., Van Deventer, J. S. J., and Lukey, G. C. (2002). “The effect of composition and temperature on the properties of fly ash and kaolinite-based geopolymers.” Chem. Eng. J., 89(1–3), 63–73.
Van Jaarsveld, J. G. S., Van Deventer, J. S. J., and Lukey, G. C. (2004). “A comparative study of kaolinite versus metakaolinite in fly ash based geopolymers containing immobilized metals.” Chem. Eng. Commun., 191(4), 531–549.
Xu, H., and Van Deventer, J. S. J. (2003). “The effect of alkali metals on the formation of geopolymeric gels from alkali-feldspars.” Colloids Surf., A, 216(1–3), 27–44.
Yip, C. K., Lukey, G. C., and Van Deventer, J. S. J. (2003). “Effect of blast furnace slag addition on microstructure and properties of metakaolinite geopolymeric materials.” Ceram. Trans., 153, 187–209.
Yip, C. K., Lukey, G. C., and Van Deventer, J. S. J. (2005). “The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation.” ⟨http://www.sciencedirect.com/⟩.
Zhang, Y. S. (2003). “Research on structure formation mechanism and properties of high performance geopolymer concrete.” Ph.D. dissertation, Southeast Univ., Nanjing, China.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 6 • June 2007
Pages: 470 - 474
Copyright
© 2007 ASCE.
History
Received: Aug 22, 2005
Accepted: May 9, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Maria Juenger
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