Investigation of drying shrinkage, water absorption and strength properties of metakaolin based geopolymer mortars
Rim ALLAM, Jamal KHATIB, Mohamad EZZEDINE El DANDACHY
Abstract. This paper investigates strength and selected durability properties (drying shrinkage and water absorption) of metakaolin-based geopolymer mortar (GPm). Four geopolymer mixes of different proportions are prepared using metakaolin as precursor with sodium hydroxide and sodium silicate as activators. The ratio of alkaline activator to precursor, the ratio between activators Na2SiO3 to NaOH and the curing temperature, varied (1.2, 1.4), (2, 3), (30, 45, and 60°C) respectively between these mixes to assess their influence on the properties. Geopolymer mortar exhibited significant improvement in shrinkage and compressive strength with values of 482µm/m and 35 MPa compared to ordinary Portland cement-based mortar (OPCm) that shows results equal to 1820µm/m and 15 MPa respectively. A significant disparity in the performance of GPm mixes is observed, which refers to the variation of the ratios and of the oven curing temperature between mixes. Results reveal that the optimum alkaline to binder ratio should be first considered to obtain a dense mortar structure. For a more complete geopolymerization, the increase of alkaline activator content should be coupled with an increase in curing temperature to block any successive dissolution.
Keywords
Geopolymer, Metakaolin, Durability, Drying Shrinkage, Water Absorption, Compressive Strength
Published online 2/25/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Rim ALLAM, Jamal KHATIB, Mohamad EZZEDINE El DANDACHY, Investigation of drying shrinkage, water absorption and strength properties of metakaolin based geopolymer mortars, Materials Research Proceedings, Vol. 48, pp 342-349, 2025
DOI: https://doi.org/10.21741/9781644903414-38
The article was published as article 38 of the book Civil and Environmental Engineering for Resilient, Smart and Sustainable Solutions
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] Saeed, A., Najm, H. M., Hassan, A., Sabri, M. M. S., Qaidi, S., Mashaan, N. S., & Ansari, K. (2022). Properties and Applications of Geopolymer Composites/ A review study of mechanical and microstructural properties. Materials, 15(22), 8250. https://doi.org/10.3390/ma15228250
[2] Issa, TarreckMahaman Manssour, et al. “Geopolymers—Base Materials and Properties of Green Structural Materials.” Materials Proceedings, vol. 13, no. 1, 2023, p. 43, www.mdpi.com/2673-4605/13/1/43, https://doi.org/10.3390/materproc2023013043 Accessed 7 July 2024.
[3] Fu, Qiang, et al. “The Microstructure and Durability of Fly Ash-Based Geopolymer Concrete/ A Review.” Ceramics International, vol. 47, no. 21, 1 Nov. 2021, pp. 29550–29566, www.sciencedirect.com/science/article/pii/S0272884221022318?via%3Dihub, https://doi.org/10.1016/j.ceramint.2021.07.190
[4] Luhar, I., &Luhar, S. (2022). A Comprehensive Review on Fly Ash-Based Geopolymer. Journal of Composites Science, 6(8), 219. https://doi.org/10.3390/jcs6080219.
[5] Brindley, G. W., & Nakahira, M. (1959). The Kaolinite‐Mullite Reaction Series/ II, Metakaolin. Journal of the American Ceramic Society, 42(7), 314–318. https://doi.org/10.1111/j.1151-2916.1959.tb14315
[6] Diffo, B. B. K., Elimbi, A., Cyr, M., Manga, J. D., &Kouamo, H. T. (2015). Effect of the rate of calcination of kaolin on the properties of metakaolin-based geopolymers. Journal of Asian Ceramic Societies, 3(1), 130–138. https://doi.org/10.1016/j.jascer.2014.12.003
[7] Singh, B., Ishwarya, G., Gupta, M., & Bhattacharyya, S. (2015). Geopolymer concrete/ A review of some recent developments. Construction & Building Materials, 85, 78–90. https://doi.org/10.1016/j.conbuildmat.2015.03.036
[8] Han, W., Lv, Y., Wang, S., Qiao, J., Zou, C., Su, M., & Peng, H. (2023). Effects of Al/Na and Si/Na Molar Ratios on the Alkalinity of Metakaolin-Based Geopolymer Pore Solutions. Materials, 16(5), 1929. https://doi.org/10.3390/ma16051929
[9] Preetha, R., Kishore, G. V. V. S. R., Sundaramurthy, C., &Laharia, A. K. (2014). Effect of Curing Methods And Environment on Properties of Concrete. ResearchGate. https://www.researchgate.net/publication/305787368_Effect_of_Curing_Methods_And_Environment_on_Properties_of_Concrete
[10] Adak, D., Sarkar, M., & Mandal, S. (2014). Effect of nano-silica on strength and durability of fly ash based geopolymer mortar. Construction & Building Materials, 70, 453–459. https://doi.org/10.1016/j.conbuildmat.2014.07.093
[11] Han, Q., Zhang, P., Wu, J., Jing, Y., Zhang, D., & Zhang, T. (2022). Comprehensive review of the properties of fly ash-based geopolymer with additive of nano-SiO2. Nanotechnology Reviews, 11(1), 1478–1498. https://doi.org/10.1515/ntrev-2022
