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Factors affecting the shrinkage of fly ash geopolymers

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Abstract

The shrinkage of fly ash geopolymers was studied in the present study. Fly ash was used as the source material for making the geopolymers. The effects of the concentration of NaOH, sodium silicate-to-NaOH ratio, liquid-to-ash ratio, curing temperature, and curing time on shrinkage were investigated. The geopolymers were cured at 25, 40, and 60°C, respectively. The results indicate that the shrinkage of geopolymers is strongly dependent on curing temperature and liquid-to-ash ratio. The increase in shrinkage is associated with the low strength development of geopolymers. It is also found that NaOH concentration and sodium silicate-to-NaOH ratio also affect the shrinkage of geopolymers but to a lesser extent.

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Authors and Affiliations

  1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand

    Charoenchai Ridtirud & Prinya Chindaprasirt

  2. Department of Industrial Chemistry, Faculty of Sciences, Chiang Mai University, Chiang Mai, 50200, Thailand

    Kedsarin Pimraksa

Authors
  1. Charoenchai Ridtirud
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  2. Prinya Chindaprasirt
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  3. Kedsarin Pimraksa
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Corresponding author

Correspondence to Prinya Chindaprasirt.

Additional information

This work was supported by the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (No.PHD/0120/2549).

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Ridtirud, C., Chindaprasirt, P. & Pimraksa, K. Factors affecting the shrinkage of fly ash geopolymers. Int J Miner Metall Mater 18, 100–104 (2011). https://doi.org/10.1007/s12613-011-0407-z

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  • DOI: https://doi.org/10.1007/s12613-011-0407-z

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