KnE Engineering
ISSN: 2518-6841
The latest conference proceedings on all fields of engineering.
Development of the Strength of the Fluidized Bed Combustion Fly Ash Based Geopolymer in Time
Published date: Apr 13 2020
Journal Title: KnE Engineering
Issue title: REMINE International Conference on Valorization of Mining and Industrial Wastes into Construction Materials By Alkali-activation
Pages: 12–24
Authors:
Abstract:
ThispaperpresentsastudyintothemechanicalbehaviourofFluidizedBedCombustion (FBC)fly ash-based geopolymer.FBCflyashisaby-product of a burning of a solid fuel (hard coal in case of this study) in a furnace at a low temperature. FBC fly ash is a type of a waste which is more difficult to recycle than pulverized fly ash.UsingFBCflyashin geopolymers offers one possible way to recycle it. The main goals of the investigation were to determine the influence of curing temperature and curing conditions on the strength of FBC fly ash-based geopolymer; to determine the changes of strength over time and the changes of the temperature inside the geopolymer during the curing process. Tests have shown that the strength of the geopolymer generally increases in line with the increase of a curing temperature. The compressive strength stabilizes after 5 days of curing and yet continues to gain extra strength over the longer term. Theflexuralbehaviourisnotmonotonicandthereforehardtopredict.The temperature inside the geopolymer rises rapidly until reaching around 27.5°C and then decreases steadily.
Keywords: geopolymer, Fluidized Bed Combustion Fly ash, temperature, strength
References:
[1] Chindaprasirt, P., Jenjirapanya, S., Rattanasak, U. (2014). Characterizations of FBC/PCC fly ash geopolymeric composites. Construction and Building Materials, vol. 66, pp.72-78.
[2] Glinicki, M.A., Zieliński, M. (2008). The influence of CFBC fly ash addition on phase composition of air-entrained concrete. Bulletin of Polish Academy of Sciences, Technical Sciences, vol. 56, no. 1, pp. 45-52
[3] Brzozowski, P. (2011). Możliwości wykorzystania popiołów lotnych ze spalania w kotłach fluidalnych do betonów układanych pod wodą. Budownictwo i Inżynieria Środowiska, vol. 2, pp. 5-11.
[4] Giergiczny, Z. (2019). Fly ash and slag. Cement and Concrete Research, vol. 124, 10582.
[5] Siler, P., Bayer, P., Sehnal, T., Kolarova, I., Opravil, T., Soukal, F. (2015). Effects of high-temperature fly ashandfluidizedbedcombustionashonthehydrationofPortlandcement. Construction and Building Materials, vol. 78, pp. 181-188.
[6] Glinicki, M.A., Jóźwiak-Niedźwiedzka, D., Dąbrowski, M. (2019). The Influence of Fluidized Bed CombustionFlyAshonthePhaseCompositionandMicrostructureofCementPaste. Materials,vol.12, 2838.
[7] Chi, M. (2016). Synthesis and characterization of mortars with circulating fluidized bed combustion fly ash and ground granulated blast-furnace slag. Construction and Building Materials, vol. 123, pp. 565-573.
[8] Haniskova,D.,Bartonickova,E.,Koplik,J.,Opravil,T.(2016).The ash from fluidized bed combustion as a donor of sulfates to the Portland clinker. Procedia Engineering, vol. 151, pp. 394-401.
[9] Song, Y., Guo, C., Qian, J., Ding, T. (2015). Effect of the Ca-to-Si ratio on the properties of autoclaved aeratedconcretecontainingcoalflyashfromcirculatingfluidizedbedcombustionboiler. Construction and Building Materials, vol. 83, pp. 136-142.
[10] Zhang, Z., Qian, J., You, C., Hu, C. (2012). Use of circulating fluidized bed combustion fly ash and slag in autoclaved brick. Construction and Building Materials, vol. 35, pp. 109-116.
[11] Wu, W., Matalkah, F., Darsanasiri, A.G.N.D., Soroushian, P. (2019). Fluidized bed combustion coal fly ash: comparative evaluation for potential use in alkali-activated binders. International Journal of Coal Preparation and Utilization.
[12] Oyun-Erdene, G., Temuujin, J. (2019). Effect of Mechanical Activation of Fluidized Bed Fly Ash on Geopolymer Properties, Solid State Phenomena, vol. 288, pp. 51-58.
[13] Duan,P.,Yan,C.,Zhou,W.,Luo,W.,Shen,C.(2015).An investigation of the microstructure and durability of a fluidized-bed fly ash–metakaolingeopolymerafterheatandacidexposure. Materials and Design, vol. 74, pp. 125-137.
[14] EN 196-1 :2016, Method of testing cement – Part 1: Determination of strength, Brussels 2016.
[15] MustafaAlBakri,A.M.,Kamarudin,H.,BinHussain,M.,KhairulNizar,I.,Zarina,Y.,Rafiza,A.R.(2011).The Effect of Curing Temperature on Physical and Chemical Properties of Geopolymers. Physics Procedia, vol. 22, pp. 286-291.
[16] Hardjito,D.,Rangan,B.V.(2005).Development and properties of low-calcium fly ash-based geopolymer concrete.Research ReportGC1.Perth, Australia. Faculty of Engineering, Curtin University of technology.
[17] Sun, Z., Vollpracht, A. (2019). One year geopolymerisation of sodium silicate activated fly ash and metakaolin geopolymers. Cement and Concrete Composites, vol. 95, pp. 98-110.
[18] Zhang, M., Zhao, M., Zhang, G., Sietins, J.M., Granados-Focil, S., Pepi, M.S., Xu, Y., Tao, M. (2018). Reaction kinetics of red mud-fly ash based geopolymers: Effects of curing temperature on chemical bonding, porosity, and mechanical strength. Cement and Concrete Composites, vol. 93, pp. 175-185.
[19] Rovnanik, P. (2010). Effect of curing temperature on the development of hard structure of metakaolinbased geopolymer. Construction and Building Materials, vol. 24, pp. 1176-1183.
[20] Yuan,J.,He,P.,Jia,D.,Yang,C.,Zhang,Y.,Yan,S.,Yang,Z.,Duan,X.,Wang,S.,Zhou,Y.(2016).Effectof curing temperature and SiO2/K2O molar ratio on the performance of metakaolin-based geopolymers. Ceramics International, vol. 42, pp. 16184-16190.
[21] Chindaprasirt,P.,Chareerat,T.,Sirivivatnanon,V.(2007).Work ability and strength of course high calcium fly ash geopolymer. Cement and Concrete Composites, vol. 29, pp. 224-229.
[22] Ekaputri, J.J., Junaedi, S, Wijaya (2017). Effect of curing temperature and fiber on metakaolin-based geopolymer. Procedia Engineering, vol. 171, pp. 572-583.
[23] Swanepoel, J.C., Strydom, C.A. (2002). Utilisation of fly ash in a geopolymeric material. Applied Geochemistry, vol. 17, pp. 1143-1148.
[24] Criado, M., Palomo, A., Fernandez-Jimenez, A. (2005). Alkali activation of fly ashes. Part 1: Effect of curing conditions on the carbonation of the reaction products, Fuel, vol. 84, 2048-2054.