Application of Fly Ash-Based Geopolymer for Structural Member and Repair Materials

Abstract:

The applications of using fly ash-based geopolymer as a structural member and a repair materials in reinforced concrete structure was conducted. The optimum mix proportion of fly ash-based geopolymer concrete using for structural beam and fly ash-based geopolymer mortar using for repair material were developed. The flexural behavior of fly ash-based geopolymer reinforced concrete and the durability aspect namely the corrosion of steel reinforcement were investigated using the electrical acceleration. For the repair purpose, the fundamental properties; that is, compressive strength, flexural strength, bonding strength between fly ash-based geopolymer mortar and mortar substrate, setting time and chloride penetration were investigated. Also, the durability of conventional reinforced concrete beam repaired by the fly ash-based geopolymer mortar comparing with the comercial repair mortar was investigated. The behavior of the fly ash-based geopolymer reinforced concrete beam was similar to that of the conventional reinforced concrete beam; however, the corrosion of the steel reinforcement of the fly ash-based geopolymer reinforced concrete beam was higher than that of the conventional reinforced concrete beam. The fundamental properties of the fly ash-based geopolymer mortar were not different from that of the commercial repair materials; however, the durability of the reinforced concrete beam repaired by the fly ash-based geopolymer mortars performed a little lower than that of repaired with the commercial repair motar and also the control reinforced concrete with no repair. As a result, even there will be still a need of improvement there was a good tendency for using the fly ash-based geopolymer as the structural member and the repair materials.

• Periodical: Advances in Science and Technology (Volume 92)
• Pages: 74-83
• DOI: https://doi.org/10.4028/www.scientific.net/AST.92.74
• Online since: October 2014
• Authors: Wanchai Yodsudjai*
• Keywords: Flexural Behavior, Fly Ash-Based Geopolymer, Rebar Corrosion, Reinforced Concrete (RC) Beam, Repair Materials

References

[1] P.K. Mehta, Concrete technology for sustainable development, Concrete International, 21 (1999) 47-52.

[2] D. Hardjito, S.E. Wallah, D.M.J. Sumajouw, B.V. Rangan, On the development of fly ash based geopolymer concrete, ACI. Material Journal. 101 (2004) 467-472.

DOI: 10.1080/13287982.2005.11464946

[3] J. Davidovits, M. Davidovics, Geopolymer room temperature ceramic matrix for composite, Ceram. Eng. Sci. Proc. 9 (1988) 842-853.

[4] A. Palomo, A. Macias, M.T. Blanco, F. Puertas, Physical, chemical and mechanical characterization of geopolymers, Proc of the 9th Internatl Congress on the Chem of Cem (1992) 505-511.

[5] G. Nounnu, Z.U.H. Chaudhary, Reinforced concrete repair in beams, Constr Build Mater, 13 (1999) 195-212.

[6] N. Mailvaganam, L. Mitchell, Repairs to restore serviceability in concrete structures, Construction Technology Update, 59, Institute for Research in Construction-National Research Council of Canada, Ottawa, Canada. (2003).

[7] W. Yodsudjai, P. Suwanvitaya, W. Pikulprayong, B. Taweesappaiboon, Testing of geopolymer mortar as a repair material, Ceramic Transaction 215 (2009) 325-334.

DOI: 10.1002/9780470909836.ch31