Mechanical Characterization of Hybrid (Organic-Inorganic) Geopolymers

Abstract:

The mechanical properties of geopolymers can be obtained through different kinds of experimental tests: this paper is focused on the compressive strength (i.e. in a direction parallel to the loading axis) for the case of uniaxial compression. The compressive strength of such materials is traditionally characterized by the 28^th-day value, but their strength is expected to increase in time at a continuously decreasing rate. The knowledge of the strength vs. time law is of importance when a structure is subjected to a certain type of loading at a later age. In this work inorganic polymers from activated metakaolin (alumina silicate inorganic polymers, obtained from alkali activation of powders containing SiO₂+Al₂O₃ > 80%_wt) are reported. In order to improve their compressive strength a percentage of polyethylene glycol has been added, thus obtaining a hybrid (organic-inorganic) geopolymer. Many factors can influence significantly the compressive strength of such materials e.g. w/c ration, aggregate content, water curing period, polyethylene/glycol ratio. Afterwards experimental compressive tests (performed in a Zwick-Roell^® testing machine) have been carried out varying the polyethylene/glycol ratio and the main dimensions of the samples.

• Periodical: Key Engineering Materials (Volumes 569-570)
• Pages: 119-125
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.569-570.119
• Online since: July 2013
• Authors: Giuseppe Lamanna, Alessandro Soprano, Flavia Bollino, Michelina Catauro
• Keywords: Compressive Strength, Geopolymer, Metakaolin (MK), Sensitivity Analysis

References

[1] Y. J. Zhang, Y. C. Wang, Li Sh, Mechanical performance an hydration mechanism of geoplymers reinforced by resin, Materials Science and Engineering A527 (2010) 6574-6580.

[2] T. Hanzliček, M. Steirenova, P. Straka, I. Pernà, P. Siegl, T. Švarcova, Reinforcement of the terracotta sculpture by geopolymer composite, Materials Science and Engineering 30 (2009) 3229-3234.

DOI: 10.1016/j.matdes.2008.12.015

[3] R. Alfani, P. Colombet, A. D'Amore, N. Rizzo, L. Nicolais, Effect of temperature on thermo-mechanical properties of Macro-Defect-Free cement-polymer composite, Journal of Materials Science 34-23 (1999) 5683-5687.

DOI: 10.1023/a:1004701529490

[4] S. Zhang, K. Gong, J. Lu, Novel modification method for inorganic polymer by using water soluble organic polymers, Materials Letters 58 (2004) 1292-1296.

DOI: 10.1016/j.matlet.2003.07.051

[5] P. Duxson, J. L. Provis, G. C. Lukey, S. W. Mallicoat, W. M. Kriven, J. S. J. van Deventer, Understanding the relationship between geopolymer composition, microstructure and mechanical properties, Colloids ad Surfaces A: Physicocemical Engineering Aspects 269 (2005).

DOI: 10.1016/j.colsurfa.2005.06.060

[6] M. Steinerova, Mechanical properties of geopolymer mortars in relation to their porous structure, Ceramics-Silikaty 55 (2011) 362-372.

[7] O. Burciaga-Diaz, J. I. Escalante-Garcia, A. Gorokhovsky, Geopolymers based on a coarse low-purity kaolin material: mechanical strength as a function of the chemical composition and temperature, Cement & Concrete Composites 34 (2012) 18-24.

DOI: 10.1016/j.cemconcomp.2011.08.001

[8] D. Penteado Dia, C. Thaumaturgo, Fracture toughness of geompolymeri concretes reinforced with basalt fibers, Cement & Concrete Composites 27 (2005) 49-54.

DOI: 10.1016/j.cemconcomp.2004.02.044

[9] M. Catauro, F. Bollino, I. Kansal, E. Kamseu, I. Lancellotti, C. Leonelli, Mechanical and biological characterization of geopolymers for potential application as biomaterials, The Azo journal of materials online, DOI: 10. 2240/azojomo0322 (2012).

DOI: 10.4028/www.scientific.net/ast.69.192

[10] R. G. Milkey, Infrared spectra of some tectosilicates, American Mineralogist 45 (1960) 990-1007.

[11] R. L. Frost, P. N. Fredericks, H. F. Shurvell, Raman microscopy of some kaolinite clay materials, Canadian Journal of Applied Spectroscopy 41 (1996) 10-14.

[12] R. W. Parker, R. L. Frost, The application of drift spectroscopy to the multicomponent analysis of organic chemicals adsorbed on montmorillonite, Clays and Clay Minerals 44 (1996) 32-40.

DOI: 10.1346/ccmn.1996.0440103

[13] Y. L. Tsai, J. V. Hanna, Y. L. Lee, M. E. Smith, J. C. C. Chan, Solid-state NMR study of geopolymer prepared by sol-gel chemistry, Journal of Solid State Chemistry 183 (2010) 3017-3022.

DOI: 10.1016/j.jssc.2010.10.008

[14] J. A. Gadsden, Infrared spectra of minerals and related inorganic compounds, Butterworths, London, (1975).

[15] W. Mozgawa, J. Deja, Spectroscopic studies of alkaline activated slag geopolymers, Journal of Molecular Structure 924-926 (2009) 434-441.

DOI: 10.1016/j.molstruc.2008.12.026