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Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag

Received: 28 May 2015     Accepted: 6 June 2015     Published: 19 June 2015
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Abstract

The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content.

Published in American Journal of Chemical Engineering (Volume 3, Issue 3)
DOI 10.11648/j.ajche.20150303.11
Page(s) 30-38
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2015. Published by Science Publishing Group

Keywords

Accelerated Ageing, GBFS, MK, Compressive Strength Regression, pH

References
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Cite This Article
  • APA Style

    Hamdy Abd El-Aziz Abdel Gawwad, Hesham Mohamed Khater, Saleh Abd El-Aleem Mohamed. (2015). Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. American Journal of Chemical Engineering, 3(3), 30-38. https://doi.org/10.11648/j.ajche.20150303.11

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    ACS Style

    Hamdy Abd El-Aziz Abdel Gawwad; Hesham Mohamed Khater; Saleh Abd El-Aleem Mohamed. Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. Am. J. Chem. Eng. 2015, 3(3), 30-38. doi: 10.11648/j.ajche.20150303.11

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    AMA Style

    Hamdy Abd El-Aziz Abdel Gawwad, Hesham Mohamed Khater, Saleh Abd El-Aleem Mohamed. Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag. Am J Chem Eng. 2015;3(3):30-38. doi: 10.11648/j.ajche.20150303.11

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  • @article{10.11648/j.ajche.20150303.11,
      author = {Hamdy Abd El-Aziz Abdel Gawwad and Hesham Mohamed Khater and Saleh Abd El-Aleem Mohamed},
      title = {Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag},
      journal = {American Journal of Chemical Engineering},
      volume = {3},
      number = {3},
      pages = {30-38},
      doi = {10.11648/j.ajche.20150303.11},
      url = {https://doi.org/10.11648/j.ajche.20150303.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajche.20150303.11},
      abstract = {The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content.},
     year = {2015}
    }
    

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  • TY  - JOUR
    T1  - Impact of Alkali Concentration and Metakaolin Content on Accelerated Ageing of Egyptian Slag
    AU  - Hamdy Abd El-Aziz Abdel Gawwad
    AU  - Hesham Mohamed Khater
    AU  - Saleh Abd El-Aleem Mohamed
    Y1  - 2015/06/19
    PY  - 2015
    N1  - https://doi.org/10.11648/j.ajche.20150303.11
    DO  - 10.11648/j.ajche.20150303.11
    T2  - American Journal of Chemical Engineering
    JF  - American Journal of Chemical Engineering
    JO  - American Journal of Chemical Engineering
    SP  - 30
    EP  - 38
    PB  - Science Publishing Group
    SN  - 2330-8613
    UR  - https://doi.org/10.11648/j.ajche.20150303.11
    AB  - The present work aims to study the coupled effect of alkali concentration and metakaolin (MK) on the resistivity of ground granulated blast-furnace slag (GGBFS) to strength regression during ageing. GGBFS was activated by 6 and 10 wt., % containing mixture of sodium hydroxide (SH) and liquid sodium silicate (LSS) at a ratio of 1:1, respectively (namely GGBFS6 and GGBFS10). On the other hand, GGBFS10 was replaced by 10, 20, 30, 40 and 50 wt., % of MK, respectively. All hardened specimens were cured in 100% relative humidity (RH) at 37 ± 2°C for 28 days (zero time) then, aged at 95°C for 56 days. Experimental results showed that, the pH value of alkali activated samples (AAS) decreased as the amount of MK increased. Also, the pH of AAS derived from GGBFS10 was higher than that of GGBFS6. The strength regression resistivity (SRR) during accelerated ageing enhanced with the decrease of alkali concentration. The compressive strength for different investigated mixes was evaluated. Also, some selected hydration products were analyzed using infrared spectroscopy (FTIR), thermo-gravimetric analysis (TG/DTG) and X- ray diffraction (XRD) techniques to determine the mineralogical phase transition. The results of mechanical properties are in a good agreement with those of FTIR, TG/DTG and XRD techniques and confirm that the SRR during ageing increases with MK content.
    VL  - 3
    IS  - 3
    ER  - 

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Author Information
  • Housing and Building National Research Center, Giza, Egypt

  • Housing and Building National Research Center, Giza, Egypt

  • Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt

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