Title:
Properties of Fly Ash-Based Geopolymer Mortars
Author(s):
A.M. Said, O. Saleh and A. Ayad
Publication:
Symposium Paper
Volume:
334
Issue:
Appears on pages(s):
122-135
Keywords:
Geopolymer; High temperature; Compressive strength; Alkali activated binder; Fly ash
DOI:
10.14359/51720256
Date:
9/30/2019
Abstract:
There is a growing need for alternative binders with smaller carbon footprint. The cement manufacture is an energy intensive process that is one of the major global contributors to carbon dioxide emission. Fly ash-based geopolymer binders represent one of these potential alternatives. Beside consuming a largely produced byproduct, fly ash-based geopolymers generally have better mechanical performance when exposed to elevated temperatures. This study evaluates the effect of the initial curing temperature and the alkaline activation solution proportions on the strength, pores structure and crystal structure of fly ash-based geopolymer mortars. The geopolymer was synthesized using Class F fly ash, potassium hydroxide solution and sodium silicate solution. The specimens were made using various ratios of sodium silicate to potassium hydroxide and were initially cured at different temperatures and their properties were studied in terms of mechanical and microstructural properties.
Related References:
1. Hardjito, D., and Rangan, B.V. (2005). Development and properties of low-calcium fly ash-based geopolymer concrete. Research Report GC 1, Curtin University of Technology, Australia.
2. Lee, W. K. (2002). Solid-Gel Interactions in Geopolymers, Doctoral Dissertation University of Melbourne, Victoria, Australia, 317P
3. Davidovits, J. (1989). Geopolymers and geopolymeric materials. Journal of Thermal Analysis and Calorimetry, 35(2), 429-441.
4. Sun, P. (2006). Fly Ash Based Inorganic Polymeric Building Material. Doctoral Dissertation, Wayne State University, Detroit, Michigan, 215p.
5. Davidovits, J. (2008). Geopolymer chemistry and applications. Geopolymer Institute.
6. Bondar, D., Lynsdale, C., Milestone, N. B., Hassani, N., and Ramezanianpour, A. (2010). Effect of type, form, and dosage of activators on strength of alkali-activated natural pozzolans. Cement and Concrete Composites, 33(2), 251-260.
7. Hardjito, D., Wallah, S.E., Sumajouw, D., and Rangan, B.V. (2004). On the development of fly ash-based geopolymer concrete. ACI Materials Journal-American Concrete Institute, 101(6), 467-472.
8. ACAA, (American Coal Ash Association), 2010 coal combustion product production and use survey, Retrieved from http://www.acaa-usa.org, 2012
9. ASTM C618 (2017). Standard specification for coal fly ash and raw of calcined natural pozzolan for use in concrete, USA: American Society for Testing and Materials.
10. Bakharev, T. (2006). Thermal behaviour of geopolymers prepared using class F fly ash and elevated temperature curing. Cement and Concrete Research, 36(6), 1134-1147.
11. Doležal, J., Škvára, F., Kopecký, L., Pavlasová, S., Lucuk, M., Dvořáček, K., Šulc, R.Concrete based on fly ash geopolymers. Proceedings of 16th Intern.Baustofftagung IBAUSIL 2006, 1.
12. Fernández‐Jiménez, A., Pastor, J.Y., Martín, A., and Palomo, A. (2010). High‐temperature resistance in alkali‐activated cement. Journal of the American Ceramic Society, 93(10), 3411-3417.
13. Hardjito, D., Wallah, S., Summajouw, D., and Rangan, B. (2004). Properties of geopolymer concrete with fly ash as source material: Effect of mixture composition. Paper presented at the Proceedings of the 7th CANMET/ACI International Conference on Recent Advances in Concrete Technology, 109-118.
14. Hardjito, D., Wallah, S. E., Sumajouw, D., and Rangan, B. V. (2005). Fly ash-based geopolymer concrete. Australian Journal of Structural Engineering, 6(1), 77-84.
15. Hardjito, D., Wallah, S., Sumajouw, D., and Rangan, B.V. (2005). Effect of mixing time and rest period on the engineering of fly ash-based geopolymer concrete. Paper presented at the Geopolymer, Green Chemistry and Sustainable Development Solutions: Proceedings of the World Congress Geopolymer 2005, 145-147.
16. Jirasit, F., and Lohaus, L. (2005). Effects of high silica-content materials on fly ash-based geopolymeric cement properties. Paper presented at the Geopolymer, Green Chemistry and Sustainable Development Solutions: Proceedings of the World Congress Geopolymer 2005, 107-111.
17. Kong, D. L. Y., and Sanjayan, J.G. (2008). Damage behavior of geopolymer composites exposed to elevated temperatures. Cement and Concrete Composites, 30(10), 986-991.
18. Kong, D. L. Y., and Sanjayan, J.G. (2010). Effect of elevated temperatures on geopolymer paste, mortar and concrete. Cement and Concrete Research, 40(2), 334-339.
19. Kumar, S., Kumar, R., Alex, T., Bandopadhyay, A., and Mehrotra, S. (2005). Effect of mechanically activated fly ash on the properties of geopolymer cement. Paper presented at the Geopolymer, Green Chemistry and Sustainable Development Solutions: Proceedings` of the World Congress Geopolymer 2005, 113-117.
20. Lloyd, N., and Rangan, V. (2009). Geopolymer concrete-sustainable cementless concrete. Paper presented at the Proceedings of the 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues, 33-54.
21. Mandal, K. K., Thokchom, S., and Roy, M. (2011). Effect of Na2O content on performance of fly ash geopolymers at elevated temperature. International Journal of
Civil and Environmental Engineering, 3(1), 34-40.
22. Palomo, A., Grutzeck, M., and Blanco, M. (1999). Alkali-activated fly ashes: A cement for the future. Cement and Concrete Research, 29(8), 1323-1329.
23. Pan, Z., Sanjayan, J. G., and Rangan, B. (2009). An investigation of the mechanisms for strength gain or loss of geopolymer mortar after exposure to elevated temperature. Journal of Materials Science, 44(7), 1873-1880.
24. Pan, Z., and Sanjayan, J.G. (2010). Stress-strain behaviour and abrupt loss of stiffness of geopolymer at elevated temperatures. Cement and Concrete Composites, 32(9), 657-664.
25. Sumajouw, D., Hardjito, D., Wallah, S., and Rangan, B., (2005). Fly ash-based geopolymer concrete: An application for structural members. Paper presented at the
Geopolymer, Green Chemistry and Sustainable Development Solutions: Proceedings of the World Congress Geopolymer 2005, 149-152.
26. Temuujin, J., Van Riessen, A., and MacKenzie, K. (2010). Preparation and characterisation of fly ash based geopolymer mortars. Construction and Building
Materials, 24(10), 1906-1910.
27. Wallah, S.E., Hardjito, D., Sumajouw, D.M.J., and Rangan, B.V. (2005a). Performance of fly ash-based geopolymer concrete under sulfate and acid exposure. Paper presented at the Geopolymer, Green Chemistry and Sustainable Development Solutions: Proceedings of the World Congress Geopolymer 2005, 153-156.
28. Wallah, S., Hardjito, D., Sumajouw, D., and Rangan, B. (2005b). Performance of geopolymer concrete under sulfate exposure. ACI Special Publication, SP 225-03, 27-36.
29. Wu, H. C., and Sun, P. (2010). Effect of mixture compositions on workability and strength of fly ash-based inorganic polymer mortar. ACI Materials Journal, 107(6).
30. Van Jaarsveld, J., and Van Deventer, J. (1999). The effect of metal contaminants on the formation and properties of waste-based geopolymers. Cement and Concrete Research, 29(8), 1189-1200.
31. Rangan, B.V., Hardjito, D., Wallah, S.E., and Sumajouw, D.M.J. (2005). Studies on fly ash-based geopolymer concrete. Paper presented at the Proceedings of the World Congress Geopolymer. France: Saint Quentin, 133-137.
32. Wallah, S., and Rangan, B. V. (2006). Low-calcium fly ash-based geopolymer concrete: Long-term properties. Research Report GC 2, Curtin University of Technology, Australia.
33. Chindaprasirt, P., Chareerat, T., and Sirivivatnanon, V. (2007). Workability and strength of coarse high calcium fly ash geopolymer. Cement and Concrete Composites, 29(3), 224-229.
34. Van Dam, T. J. (2010). Geopolymer Concrete, Retrieved February 03, 2019. from US Department of Transportation, Federal Highway Administration website:
http://www.fhwa.dot.gov/pavement/concrete/pubs/hif10014/hif10014.pdf
35. ASTM C128 (2015). Standard test method for density, relative density (specific gravity), and absorption of fine aggregate, USA: American Society for Testing and Materials.
36. AiSTM C109 (2016). Standard test method for compressive strength of hydraulic cement mortars, USA: American Society for Testing and Materials.
37. ASTM C305 (2014). Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency, USA: American Society for Testing and
Materials 38. Garboczi, E. J. (1990). Permeability, diffusivity, and microstructural parameters: A critical review. Cement and Concrete Research, 20(4), 591-601.
39. Rovnaník, P. (2010). Effect of curing temperature on the development of hard structure of metakaolin-based geopolymer. Construction and Building Materials, 24(7), 1176-1183.
40. Fletcher, R.A., MacKenzie, K.J.D., Nicholson, C.L., and Shimada, S. (2005). The composition range of aluminosilicate geopolymers. Journal of the European Ceramic Society, 25(9), 1471-1477.