Evaluation of Total Reactive Oxide Ratios and Working Solution Ratios on Strength Development in Fly Ash–Based Geopolymers
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 4
Abstract
Fly ash–based geopolymers are being developed as sustainable alternate binders for producing concrete. The consistent production of a stable geopolymeric binder suitable for use in structural applications from alkaline activation of low-calcium fly ash was explored in this paper. The role of working solution and total reactive oxide ratios in consistently achieving high compressive strength in fly ash–based geopolymers were evaluated using different source fly ashes. The primary source variability was identified with the reactive silica and alumina contents in the fly ash. The maximum strength achieved from the activated fly ash was determined by the reactive alumina content in the fly ash. Due to source variability of reactive species contributed by fly ash, maintaining a constant composition of the activating solution resulted in varying compressive strength from the activated fly ash. Keeping constant reactive oxide contents in the activated system produced consistent strength from the fly ash–based geopolymers. The composition of the aluminosilicate gel depended on the reactive oxide ratios, and it varied with the fly ash composition for identical solution ratios. Global reactive oxide ratios, which are calculated based on the reactive oxide contents of the fly ash and the alkaline solution, were established. The link between strength and product formation was established, and the global reactive oxide ratios resulted in a larger reaction product content.
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Data Availability Statement
Some or all data used during the study are available from the corresponding author by request.
References
ASTM. 2010. Standard specification for coal fly ash and raw or calcined natural pozzolan for use. ASTM C618. West Conshohocken, PA: ASTM.
Aughenbaugh, K. L., T. Williamson, and M. C. G. Juenger. 2015. “Critical evaluation of strength prediction methods for alkali-activated fly ash.” Mater. Struct. 48 (3): 607–620. https://doi.org/10.1617/s11527-014-0496-z.
Bhagath Singh, G. V. P., C. Subrahmanyam, and K. V. L. Subramaniam. 2017. “Dissolution of the glassy phase in low-calcium fly ash during alkaline activation.” Adv. Cem. Res. 30 (7): 313–322. https://doi.org/10.1680/jadcr.17.00170.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2016a. “Quantitative XRD analysis of binary blends of siliceous fly ash and hydrated cement.” J. Mater. Civ. Eng. 28 (8): 04016042. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001554.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2016b. “Quantitative XRD study of amorphous phase in alkali activated low calcium siliceous fly ash.” Constr. Build. Mater. 124 (Oct): 139–147. https://doi.org/10.1016/j.conbuildmat.2016.07.081.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2017. “Evaluation of sodium content and sodium hydroxide molarity on compressive strength of alkali activated low-calcium fly ash.” Cem. Concr. Compos. 81 (Aug): 122–132. https://doi.org/10.1016/j.cemconcomp.2017.05.001.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2018. “Characterization of Indian fly ashes using different experimental techniques.” Indian Concr. J. 92 (3): 10–23.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2019a. “Effect of active components on strength development in alkali-activated low calcium fly ash cements.” J. Sustainable Cem.-Based Mater. 8 (1): 1–19. https://doi.org/10.1080/21650373.2018.1520657.
Bhagath Singh, G. V. P., and K. V. L. Subramaniam. 2019b. “Influence of processing temperature on the reaction product and strength gain in alkali-activated fly ash.” Cem. Concr. Compos. 95 (Jul): 10–18. https://doi.org/10.1016/j.cemconcomp.2018.10.010.
BIS (Bureau of Indian Standards). 2003. Pulverized fuel ash-specification. BIS 3812-part 1. New Delhi, India: BIS.
CEA (Central Electricity Authority). 2016. Annual report on fly-ash utilization. New Delhi, India: CEA.
Chindaprasirt, P., P. De Silva, K. Sagoe-Crentsil, and S. Hanjitsuwan. 2012. “Effect of and on the setting and hardening of high calcium fly ash-based geopolymer systems.” J. Mater. Sci. 47 (12): 4876–4883. https://doi.org/10.1007/s10853-012-6353-y.
Criado, M., A. Fernández Jiménez, I. Sobrados, A. Palomo, and J. Sanz. 2012. “Effect of relative humidity on the reaction products of alkali activated fly ash.” J. Eur. Ceram. Soc. 32 (11): 2799–2807. https://doi.org/10.1016/j.jeurceramsoc.2011.11.036.
Criado, M., A. Fernández-Jiménez, A. G. de la Torre, M. A. G. Aranda, and A. Palomo. 2007. “An XRD study of the effect of the ratio on the alkali activation of fly ash.” Cem. Concr. Res. 37 (5): 671–679. https://doi.org/10.1016/j.cemconres.2007.01.013.
Criado, M., A. Fernández-Jiménez, and A. Palomo. 2010. “Alkali activation of fly ash. Part III: Effect of curing conditions on reaction and its graphical description.” Fuel 89 (11): 3185–3192. https://doi.org/10.1016/j.fuel.2010.03.051.
Duxson, P., A. Fernández-Jiménez, J. L. Provis, G. C. Lukey, A. Palomo, and J. S. J. Van Deventer. 2007. “Geopolymer technology: The current state of the art.” J. Mater. Sci. 42 (9): 2917–2933. https://doi.org/10.1007/s10853-006-0637-z.
Duxson, P., J. L. Provis, G. C. Lukey, S. W. Mallicoat, W. M. Kriven, and J. S. J. Van Deventer. 2005. “Understanding the relationship between geopolymer composition, microstructure and mechanical properties.” Colloids Surf., A 269 (1–3): 47–58. https://doi.org/10.1016/j.colsurfa.2005.06.060.
ENVIS Centre on Flyash. 2017. Summary of fly ash generation and utilization during the year 2011-12, 2012-13, 2013-14, 2014-15 and 2015-16, 2016-2017. New Delhi, India: ENVIS Centre on Flyash.
Fernández-Jiménez, A., A. G. de la Torre, A. Palomo, G. López-Olmo, M. M. Alonso, and M. A. G. Aranda. 2006. “Quantitative determination of phases in the alkali activation of fly ash. I: Potential ash reactivity.” Fuel 85 (5–6): 625–634. https://doi.org/10.1016/j.fuel.2005.08.014.
Hajimohammadi, A., and J. S. J. van Deventer. 2017. “Characterisation of one-part geopolymer binders made from fly ash.” Waste Biomass Valorization 8 (1): 225–233. https://doi.org/10.1007/s12649-016-9582-5.
Hardjito, D., and B. V. Rangan. 2005. Development and properties of low-calcium fly ash based geopolymer concrete. Perth, Australia: Faculty of Engineering, Curtin Univ. of Technology.
Jang, J. G., and H. K. Lee. 2016. “Effect of fly ash characteristics on delayed high-strength development of geopolymers.” Constr. Build. Mater. 102 (Jan): 260–269. https://doi.org/10.1016/j.conbuildmat.2015.10.172.
Khale, D., and R. Chaudhary. 2007. “Mechanism of geopolymerization and factors influencing its development: A review.” J. Mater. Sci. 42 (3): 729–746. https://doi.org/10.1007/s10853-006-0401-4.
Leong, H. Y., D. E. L. Ong, J. G. Sanjayan, and A. Nazari. 2016. “The effect of different and ratios of alkali activator on compressive strength of fly ash based-geopolymer.” Constr. Build. Mater. 106 (Mar): 500–511. https://doi.org/10.1016/j.conbuildmat.2015.12.141.
Oh, J. E., Y. Jun, and Y. Jeong. 2014. “Characterization of geopolymers from compositionally and physically different Class F fly ashes.” Cem. Concr. Compos. 50 (Jul): 16–26. https://doi.org/10.1016/j.cemconcomp.2013.10.019.
Oh, J. E., P. J. M. Monteiro, S. S. Jun, S. Choi, and S. M. Clark. 2010. “The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers.” Cem. Concr. Res. 40 (2): 189–196. https://doi.org/10.1016/j.cemconres.2009.10.010.
Ryu, G. S., Y. B. Lee, K. T. Koh, and Y. S. Chung. 2013. “The mechanical properties of fly ash-based geopolymer concrete with alkaline activators.” Constr. Build. Mater. 47 (Oct): 409–418. https://doi.org/10.1016/j.conbuildmat.2013.05.069.
Songpiriyakij, S., T. Kubprasit, C. Jaturapitakkul, and P. Chindaprasirt. 2010. “Compressive strength and degree of reaction of biomass- and fly ash-based geopolymer.” Constr. Build. Mater. 24 (3): 236–240. https://doi.org/10.1016/j.conbuildmat.2009.09.002.
Soutsos, M., A. P. Boyle, R. Vinai, A. Hadjierakleous, and S. J. Barnett. 2016. “Factors influencing the compressive strength of fly ash based geopolymers.” Constr. Build. Mater. 110 (May): 355–368. https://doi.org/10.1016/j.conbuildmat.2015.11.045.
Tennakoon, C., A. Nazari, J. G. Sanjayan, and K. Sagoe-Crentsil. 2014. “Distribution of oxides in fly ash controls strength evolution of geopolymers.” Constr. Build. Mater. 71 (Nov): 72–82. https://doi.org/10.1016/j.conbuildmat.2014.08.016.
Van Jaarsveld, J. G. S., J. S. J. Van Deventer, and G. C. Lukey. 2002. “The effect of composition and temperature on the properties of fly ash- and kaolinite-based geopolymers.” Chem. Eng. J. 89 (1–3): 63–73. https://doi.org/10.1016/S1385-8947(02)00025-6.
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©2020 American Society of Civil Engineers.
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Received: May 4, 2019
Accepted: Sep 5, 2019
Published online: Jan 31, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 30, 2020
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