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Archives of Civil Engineering

The Journal of Polish Academy of Sciences

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Synthesis of Geopolymer Based Class-F Fly Ash Aggregates and its Composite Properties in Concrete

P. Gomathi / A. Sivakumar
Published Online: 2014-03-12 | DOI: https://doi.org/10.2478/ace-2014-0003


This study explores the influence of alkali activators on the initiation of polymerization reaction of alumino-silicate minerals present in class-F fly ash material. Different types of fly ash aggregates were produced with silicate rich binders (bentonite and metakaolin) and the effect of alkali activators on the strength gain properties were analyzed. A comprehensive examination on its physical and mechanical properties of the various artificial fly ash aggregates has been carried out systematically. A pelletizer machine was fabricated in this study to produce aggregate pellets from fly ash. The efficiency and strength of pellets was improved by mixing fly ash with different binder materials such as ground granulated blast furnace slag (GGBS), metakaolin and bentonite. Further, the activation of fl y ash binders was done using sodium hydroxide for improving its binding properties. Concrete mixes were designed and prepared with the different fly ash based aggregates containing different ingredients. Hardened concrete specimens after sufficient curing was tested for assessing the mechanical properties of different types concrete mixes. Test results indicated that fly ash -GGBS aggregates (30S2-100) with alkali activator at 10M exhibited highest crushing strength containing of 22.81 MPa. Similarly, the concrete mix with 20% fly ash-GGBS based aggregate reported a highest compressive strength of 31.98 MPa. The fly ash based aggregates containing different binders was found to possess adequate engineering properties which can be suggested for moderate construction works.

Keywords: Bentonite; Metakaolin; Fly ash; Ground granulated blast furnace slag; Alkali activator; Pelletized aggregates; crushing strength


  • 1. K. I. HARIKRISHNAN, K. RAMAMURTHY, Influence of Pelletization Process on the Properties of Fly Ash Aggregates, Waste Manag, 26, 846-852, 2006.Google Scholar

  • 2. J. M. J. M. BIJEN, The manufacturing processes of artificial lightweight aggregates from fly ash, Int. J. Cement Composites Lightweight concrete, 8, 3, 191-9, 1986.Google Scholar

  • 3. R. MANIKANDAN, K. RAMAMURTHY, Influence of fineness of fly ash on the aggregate pelletization process, Cement Concrete Composites, 29, 456-464, 2007.Web of ScienceCrossrefGoogle Scholar

  • 4. R. MANIKANDAN, K. RAMAMURTHY, Effect of Curing Method on Characteristics of Cold Bonded Fly Ash Aggregate, Cement Concrete Composites, 30, 848-853, 2008.Web of ScienceCrossrefGoogle Scholar

  • 5. K. RAMAMURTHY, K. I. HARIKRISHNAN, Influence of binders on properties of sintered fly ash aggregate, Cement Concrete Composites, 28, 33-38, 2006.Google Scholar

  • 6. WANG LIJIU, ZHANG SHUZHONG, ZHAO GUOFAN, Investigation of the Mix Ratio Design of Lightweight Aggregate Concrete, Cement Concrete Res., 35, 931-935, 2005.Google Scholar

  • 7. BEKIR ILKER TOPCU, TAYFUN UYGUNOGLU, Properties of Autoclaved Lightweight Aggregate Concrete, Build. Environ, 42, 4108-4116, 2007.Web of ScienceGoogle Scholar

  • 8. C. L. VERMA, S. K. HANDA, S. K. JAIN, R. K. YADAW, Techno-commercial perspective study for sintered fl y ash light-weight aggregates in India, Constr. Build. Mater, 12, 341-346, 1998.Google Scholar

  • 9. S. GEETHA, K. RAMAMURTHY, Properties of Sintered Low Calcium Bottom Ash Aggregate with Clay Binders, Constr. Build. Mater, 25, 2002-2013, 2011.Google Scholar

  • 10. NIYAZI UGUR KOCKAL, TURAN OZTURAN, Effects of lightweight fl y ash aggregate properties on the behavior of lightweight concretes, Journal of Hazardous Materials, 179, 954-965, 2010.Google Scholar

About the article

Received: 2013-10-07

Revised: 2014-02-24

Published Online: 2014-03-12

Published in Print: 2014-03-01

Citation Information: Archives of Civil Engineering, Volume 60, Issue 1, Pages 55–75, ISSN (Online) 1230-2945, DOI: https://doi.org/10.2478/ace-2014-0003.

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© Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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