Effect of Kaolinite Mass Ratio on Compressive Strength of Kaolinite-Calcite Based Geopolymer

This study focuses on the preparation of geopolymers using various proportions of kaolinite and calcite mixture, and the effects of kaolinite mass ratio to calcite on compressive strength of kaolinite/calcite-based geopolymer. Several geopolymer samples were formed using pure kaolinite, pure calcite, and various mass ratio of kaolinite to calcite to examine properties of the geopolymers. The impact of NaOH concentration on the compressive strength of the geopolymers was also examined. The results of the laboratory analyses indicate that the compressive strength of geopolymers did not increase steadily with increasing concentration of NaOH. The optimum workability of geopolymers was obtained at 10 M NaOH and 30 % kaolinite content in the mixture. Several sensitivity experiments were carried out using the parameters at cure temperatures of 22, 45, 65 and 85oC. The best compressive strength of 12.68 MPa was obtained on the 28th day of curing process at 85oC. The structural evolution of the geopolymers prepared was investigated using FTIR spectroscopy. They were also characterized by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).

Keywords:

Geopolymers, Compressive strength, Kaolinite Calcite, Curing temperature,

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[1] Villa, C., E.T.Pecina, R.Torres, L.Gomez “Geopolymer synthesis using alkaline activation of natural zeolite” Construction and Building Materials. 24 (2010) 2084-2090 [2] Beycioğlu, A., C.Başyiğit “Rule-Based Mamdani-Type Fuzzy Logic Approach to Estimate Compressive Strength of Lightweight Pumice Concrete” ACTA PHYSICA POLONICA A. 128(2B) (2015) 424-426 [3] Kusak, I., M.Lunak, P.Rovnanik “Electric conductivity changes in geopolymer samples with added carbon nanotubes” Procedia Engineering 151 ( 2016 ) 157 – 161 [4] Heah, C., Y., H Kamarudin, A.M.Mustafa Al Bakri, M.Bnhussain, M. Luqman, I.Khairul Nizar, C.M.Ruzaidi Y.M.Liew “Study on solids-to-liquid- and alkaline activator ratios on kaolin-based geopolymers” Construction and Building Materials. 35 (2012) 912–922 [5] Autef, A., E.Joussein, G.Gasgnier, S.Pronier, I.Sobrados, J.Sanz, S. Rossignol “Role of metakaolin dehydroxylation in geopolymer Synthesis” Powder Technology. 250 (2013) 33–39 [6] Lee, N., K., E.M.Kim, H.K.Lee “Mechanical properties and setting characteristics of geopolymer mortar using styrene-butadiene (SB) latex” Construction and Building Materials. 113 (2016) 264–272 [7] Mijarsh, M., J., A., M.A.Megat Johari, Z.A.Ahmad “Synthesis of geopolymer from large amounts of treated palm oil fuel ash: Application of the Taguchi method in investigating the main parameters affecting compressive strength” Construction and Building Materials 52 (2014) 473–481 [8] Alshaaer, M., B.El-Esweed, R.I.Yousef, F.Khalili, H.Rahier “Development of functional geopolymers for water purification, and construction purposes” Journal of Saudi Chemical Society. 20 (2016) 85–92 [9] Alshaaer, M. “Two-phase geopolymerization of kaolinite-based geopolymers” Applied Clay Science. 86 (2013) 162–168 [10] Fiocco, L., B.Michielsen, E.Bernardo “Silica-bonded apatite scaffolds from calcite-filled preceramic polymers” Journal of the European Ceramic Society. 36 (2016) 3211–3218 [11] Provis, J., L., P.Duxson, J.S.J.Van Deventer, G.C.Lukey “The Role of Mathematical Modelling and Gel Chemistry in Advancing Geopolymer Technology” Chemical Engineering Research and Design. 83 (2005) 853-860