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Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement

Received: 4 May 2017     Accepted: 18 May 2017     Published: 13 July 2017
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Abstract

Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition in the local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with the use of calcined clay pozzolans is slow setting and strength development, especially at early ages. This paper presents a study of the effect of Na2SO4 on the mechanical properties of high volume pozzolan cements. The cements containing 30 wt. %, 40 wt. %, 50 wt. % and 60 wt. % calcined clay pozzolan was activated with 1%, 2%, 3% and 4% Na2SO4. Some physical properties such as Blaine index, specific gravity, water demand and setting times were determined. The chemical compositions of the blended cements were also analyzed. The effect of Na2SO4 on compressive strength of blended cements was determined after 2, 7, 28 and 180 days. Durability studies on activated blended cements in aggressive media were also conducted. Activation with a minimum of 2% Na2SO4 improved the 2 days compressive strength of cement containing 60% calcined clay pozzolan by 66.2% and caused it to behave as Class 32.5N cement, at 28 days. As Na2SO4 dosage increased, compressive strength also increased. The optimum Na2SO4 dosage was 2%. Activated blended cements resisted MgSO4 environment better than unactivated cements

Published in American Journal of Mechanical and Materials Engineering (Volume 1, Issue 3)
DOI 10.11648/j.ajmme.20170103.13
Page(s) 78-82
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), 2017. Published by Science Publishing Group

Keywords

Pozzolan Cement, Activation, Admixture, Durability, Compressive Strength, Setting Time

References
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Cite This Article
  • APA Style

    Kwabena Appiah Boakye, Albert Amartey Adjaottor, Trinity Ama Tagbor, Delali Adjei. (2017). Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement. American Journal of Mechanical and Materials Engineering, 1(3), 78-82. https://doi.org/10.11648/j.ajmme.20170103.13

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    ACS Style

    Kwabena Appiah Boakye; Albert Amartey Adjaottor; Trinity Ama Tagbor; Delali Adjei. Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement. Am. J. Mech. Mater. Eng. 2017, 1(3), 78-82. doi: 10.11648/j.ajmme.20170103.13

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    AMA Style

    Kwabena Appiah Boakye, Albert Amartey Adjaottor, Trinity Ama Tagbor, Delali Adjei. Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement. Am J Mech Mater Eng. 2017;1(3):78-82. doi: 10.11648/j.ajmme.20170103.13

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  • @article{10.11648/j.ajmme.20170103.13,
      author = {Kwabena Appiah Boakye and Albert Amartey Adjaottor and Trinity Ama Tagbor and Delali Adjei},
      title = {Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement},
      journal = {American Journal of Mechanical and Materials Engineering},
      volume = {1},
      number = {3},
      pages = {78-82},
      doi = {10.11648/j.ajmme.20170103.13},
      url = {https://doi.org/10.11648/j.ajmme.20170103.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmme.20170103.13},
      abstract = {Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition in the local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with the use of calcined clay pozzolans is slow setting and strength development, especially at early ages. This paper presents a study of the effect of Na2SO4 on the mechanical properties of high volume pozzolan cements. The cements containing 30 wt. %, 40 wt. %, 50 wt. % and 60 wt. % calcined clay pozzolan was activated with 1%, 2%, 3% and 4% Na2SO4. Some physical properties such as Blaine index, specific gravity, water demand and setting times were determined. The chemical compositions of the blended cements were also analyzed. The effect of Na2SO4 on compressive strength of blended cements was determined after 2, 7, 28 and 180 days. Durability studies on activated blended cements in aggressive media were also conducted. Activation with a minimum of 2% Na2SO4 improved the 2 days compressive strength of cement containing 60% calcined clay pozzolan by 66.2% and caused it to behave as Class 32.5N cement, at 28 days. As Na2SO4 dosage increased, compressive strength also increased. The optimum Na2SO4 dosage was 2%. Activated blended cements resisted MgSO4 environment better than unactivated cements},
     year = {2017}
    }
    

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  • TY  - JOUR
    T1  - Influence of Na2SO4 on the Mechanical Properties of High Volume Calcined Clay Pozzolan Cement
    AU  - Kwabena Appiah Boakye
    AU  - Albert Amartey Adjaottor
    AU  - Trinity Ama Tagbor
    AU  - Delali Adjei
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    DO  - 10.11648/j.ajmme.20170103.13
    T2  - American Journal of Mechanical and Materials Engineering
    JF  - American Journal of Mechanical and Materials Engineering
    JO  - American Journal of Mechanical and Materials Engineering
    SP  - 78
    EP  - 82
    PB  - Science Publishing Group
    SN  - 2639-9652
    UR  - https://doi.org/10.11648/j.ajmme.20170103.13
    AB  - Calcined clay pozzolan, the major mineral admixture used in Ghana to partially substitute ordinary Portland cement has gained massive recognition in the local construction industry because of its technical advantages and affordability. The most prominent undesirable property associated with the use of calcined clay pozzolans is slow setting and strength development, especially at early ages. This paper presents a study of the effect of Na2SO4 on the mechanical properties of high volume pozzolan cements. The cements containing 30 wt. %, 40 wt. %, 50 wt. % and 60 wt. % calcined clay pozzolan was activated with 1%, 2%, 3% and 4% Na2SO4. Some physical properties such as Blaine index, specific gravity, water demand and setting times were determined. The chemical compositions of the blended cements were also analyzed. The effect of Na2SO4 on compressive strength of blended cements was determined after 2, 7, 28 and 180 days. Durability studies on activated blended cements in aggressive media were also conducted. Activation with a minimum of 2% Na2SO4 improved the 2 days compressive strength of cement containing 60% calcined clay pozzolan by 66.2% and caused it to behave as Class 32.5N cement, at 28 days. As Na2SO4 dosage increased, compressive strength also increased. The optimum Na2SO4 dosage was 2%. Activated blended cements resisted MgSO4 environment better than unactivated cements
    VL  - 1
    IS  - 3
    ER  - 

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Author Information
  • Building Materials Development Division, CSIR-Building and Road Research Institute, Kumasi, Ghana

  • Department of Materials Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

  • Building Materials Development Division, CSIR-Building and Road Research Institute, Kumasi, Ghana

  • Building Materials Development Division, CSIR-Building and Road Research Institute, Kumasi, Ghana

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