Effects of Sodium Silicate Proportion on Strength Development of Calcined Clay Geopolymer Mortar

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

Abstract

Geopolymers are derived from the synthesis of reactive alumino silicate source with alkali metal source to produce a binder that has lower carbon footprint compared to the traditional Portland cement. The long-term supply of precursors for geopolymers in the UK will be difficult to secure based on the dominant used materials – PFA, GGBS and white Metakaolin. Iron rich lateritic clay may offer a good alternative due to its low embodied energy and abundance. In this study, seven mixes were designed and tested. The first five mixes were based on varying the molar oxide ratios of the mortar mixes by activating the flash calcined lithomarge clay with different proportions of 54.5% Na2SiO3 solution. The last two mixes were grouts based on different water to
geopolymer solid ratios. The important characteristics of the fresh and hardened mortars that were investigated based on the relevant standards are: strength development, setting times, UPV and rheological properties. The mix that achieved the peak strength of 30 MPa at 28 days cured under sealed
condition has molar oxide ratios - SiO2/Al2O3, Na2O/Al2O3, Na2O/SiO2 and H2O/Na2O of 4.12, 1, 0.24 and 14.1 respectively. The results also showed that a more controllable and consistent rheology was achieved by increasing the water to geopolymer solid ratio of the grout.
Original languageEnglish
Title of host publicationEffects of Sodium Silicate Proportion on Strength Development of Calcined Clay Geopolymer Mortar
EditorsRichard J, Ball, Barrie Dams, Veronica Ferrandiz-Mas, Xinyuan Ke, Kevin Paine, Mark Tyrer, Peter Walker
Place of PublicationBath, UK
Publisher University of Bath
Pages148-152
Number of pages5
ISBN (Print)9780861972012
Publication statusPublished - 9 Sep 2019
Event39th Cement and Concrete Science Conference 2019
- University of Bath, Bath, United Kingdom
Duration: 9 Sep 201910 Sep 2019
Conference number: 39th

Conference

Conference39th Cement and Concrete Science Conference 2019
CountryUnited Kingdom
CityBath
Period9/09/1910/09/19

Keywords

  • Calcined lithomarge clay
  • Na2SiO3
  • geopolymer
  • mortar
  • compressive strength

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  • Cite this

    Shinkafi, A. B., Khorami, M., Ganjian, E., & Tyrer, M. (2019). Effects of Sodium Silicate Proportion on Strength Development of Calcined Clay Geopolymer Mortar. In R. J. Ball, B. Dams, V. Ferrandiz-Mas, X. Ke, K. Paine, M. Tyrer, & P. Walker (Eds.), Effects of Sodium Silicate Proportion on Strength Development of Calcined Clay Geopolymer Mortar (pp. 148-152). [053] Bath, UK: University of Bath.