From a View of Alkali Solution: Alkali Concentration to Determine Hydration Process of Alkali Activating Metakaolin

  • Mu SongEmail author
  • Jiang Qian
  • Liu J. Zhong
  • Shi Liang
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)


With increasing concerns on concept of sustainability from the world, alkali activating binder materials has gained lots of concerns from academy and industry. However, hydration mechanism of alkali activating metakaolin is still not clearly understood. As a key component of alkali activating binder material, role of alkali solution and its action mechanism on hydration of alkali activating metakaolin are reported rarely. The present research studied influence of alkali concentration on hydration process and microstructure formation of alkali activating metakaolin. Penetration resistance, setting time, compressive strength, hydration heat, and scanning electron microscope, were adopted to reveal the hydration process influenced by concentration of alkali solution. Results show that high concentration of alkali solution accelerated hydration process of metakaolin, but over high concentration was resulted in a decreasing trend of compressive strength in the entire age of 60 days.


Compressive Strength Alkali Solution Penetration Resistance Water Glass Alkali Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.



Authors appreciate the financial supports from the China Postdoctoral Science Foundation under the contract No. 2013M531296, and the Postdoctoral Science Foundation of Jiangsu Province under the contract No. 1301160C.


  1. 1.
    Al Bakri, A.M.M., Kamarudin, H., et al.: Effect of Na2SiO3/NaOH ratios and NaOH molarities on compressive strength of fly-ash-based geopolymer. ACI Mater. J. 109(5), 503–508 (2012)Google Scholar
  2. 2.
    Gorhan, G., Kurklu, G.: The influence of the NaOH solution on the properties of the fly ash-based geopolymer mortar cured at different temperatures. Compos. Part B-Eng. 58, 371–377 (2014)CrossRefGoogle Scholar
  3. 3.
    Heah, C.Y., Kamarudin, H., et al.: Study on solids-to-liquid and alkaline activator ratios on kaolin-based geopolymers. Constr. Build. Mater. 35, 912–922 (2012)CrossRefGoogle Scholar
  4. 4.
    Heah, C.Y., Kamarudin, H., et al.: Kaolin-based geopolymers with various NaOH concentrations. Int. J. Min. Metall. Mat. 20(3), 313–322 (2013)CrossRefGoogle Scholar
  5. 5.
    Tchakoute, H.K., Elimbi, A., et al.: Synthesis of geopolymers from volcanic ash via the alkaline fusion method: effect of Al2O3/Na2O molar ratio of soda-volcanic ash. Ceram. Int. 39(1), 269–276 (2013)CrossRefGoogle Scholar
  6. 6.
    Chindaprasirt, P., Chareerat, T., Sirivivatnanon, V.: Workability and strength of coarse high calcium fly ash geopolymer. Cem. Concr. Compos. 29(3), 224–229 (2007)CrossRefGoogle Scholar
  7. 7.
    Xu, H., Van Deventer, J.S.J.: The geopolymerisation of alumino-silicate minerals. Int. J. Miner. Process. 59(3), 247–266 (2000)CrossRefGoogle Scholar
  8. 8.
    Phair, J.W., Van Deventer, J.S.J.: Effect of silicate activator pH on the leaching and material characteristics of waste-based inorganic polymers. Miner. Eng. 14(3), 289–304 (2001)CrossRefGoogle Scholar

Copyright information

© RILEM 2015

Authors and Affiliations

  • Mu Song
    • 1
    • 2
    Email author
  • Jiang Qian
    • 1
    • 2
  • Liu J. Zhong
    • 1
    • 2
  • Shi Liang
    • 1
    • 2
  1. 1.State Key Laboratory of High Performance Civil Engineering MaterialsJiangsu Research Institute of Building ScienceNanjingPeople’s Republic of China
  2. 2.Jiangsu SOBUTE New Materials Co., LtdNanjingPeople’s Republic of China

Personalised recommendations