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Effect of Fly Ash Fineness on Sorption Properties of Geopolymers Based On Liquid Glass
Fly ash (FA) thanks to the significant presence of SiO2 and Al2O3 as the main components is a potential raw material for geopolymers production. Mechanical activation is a method for improving FA reactivity and also the porosity of final mixture; those parameters can be analysed through sorption properties. They have direct impact on the durability of fly ash based geopolymer mortars. In the paper, effect of FA fineness on sorption properties of geopolymers based on sodium silicate, as well as relationship between fly ash fineness and apparent density, compressive and flexural strength of geopolymers are presented. The best results in the evaluated area reached the sample H1, which contents the highest portion of particle under 20μm (100% of GFA). The interdependence of individual tested properties was confirmed for geopolymer mixtures corresponding to those in the cement based mixtures: higher is portion of fine particles < 20μm, higher is strength, density and lower are sorption properties. The compressive strength as well as sorption parameters of the geopolymer can be reasonably controlled by grinding process and also ensured by the higher share of fine particle (to 20μm) in total mass of the material.
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[1] J. Junak, N. Stevulova, “Alkali activated binder based on fly ash, “Chemicals sheets, Vol. 108, No. 6, pp. 620-623, 2014 (in Slovak).
[2] J. Junak, N. Stevulova, “Activation techniques of coal fly ash for its application as a partial cement replacement in concrete,“ Folia Oecologica 3, Vol. 51, No. 3, pp. 142-147, 2010.
[3] K. Komintsas and D. Zaharaki, “Geopolymerisation: A review and prospects for the mineral industry,” Mineral Engineering 20, pp. 1261– 1277, 2007.
[4] G. Mucsi, J. Lakatos, Z. Molnar and R. Szabo, “Development of geopolymer using industrial waste materials”, in Proc. The 9th International Conference “Environmental engineering,” Vilnius, Lithuania, 2014, ISBN 978-609-457-640-9
[5] J. Davidovits, Geopolymer Chemistry and Application, Institut Geopolimére, Saint Quentin (France), 2008.
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[7] P. Balaz, Extractive Metallurgy of Activated Minerals, Elsevier, Amsterdam 2000, p. 278.
[8] Tkacova, K. Mechanical Activation of Minerals, Elsevier, Amsterdam 1989, p. 293
[9] N. Marjanović, Komljenović, Z. Bascarević and V. Nikolić, “Improving reactivity of fly ash and properties of ensuing geopolymers through mechanical activation,” Construction and Building Materials. Vol. 57, pp. 151-162, 2014.
[10] S. Tokchom et al., “Effect of water absorption, porosity, and sorptivity on durability of geopolymer mortars,” ARPN Journal of Engineering and Applied Sciences, Vol. 4, pp. 28-32, 2009.
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[13] STN 73 1316, Determination of moisture, water absorption and capillarity of concrete, national standard, 1989.
[14] EN 1015-18, Methods of test for mortar for masonry. Part 18: Determination of water absorption coefficient due to capillary action of hardened mortar, 2003.
[15] EN 1015-11, Methods of test for mortar for masonry. Part 11: Determination of flexural and compressive strength of hardened mortar, 2001.
[16] N. Sivakumar and L. Tan, “Effect of fly ash fineness on the performance of cement mortar,” Jordan Journal of Civil Engineering, Vol. 7, No. 3, 2013.
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[18] P. Chindaprasirt, Ch. Jaturapitakkul and T. Sinsiri, “Effect of fly ash fineness on compressive strength and pore size of blended cement paste,” Cement & Concrete Composites, Vol. 27, pp. 425-428, 2005.
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