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Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2

Received: 11 February 2016     Accepted: 28 February 2016     Published: 17 March 2016
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Abstract

In recent years, there is a great interest in replacing a long time used materials in concrete structure by nanomaterials (NMs) to produce a concrete with novel functions. NMs are used either to replace a part of cement, producing ecological profile concrete or as admixtures in cement pastes. The great reactivity of NMs is attributed to their high purities and specific surface areas. A number of NMs been explored and among of them nanosilica (NS) has been used most extensively. This work aims to study, the hydration behavior of composite cements containing fly ash (FA) and nanosilica. Different cement blends were made from OPC, FA and NS. OPC was substituted with FA up to 30.0 mass, %, then the FA portion was replaced by equal amounts of NS (2.0, 4.0 and 6.0 mass, %). The hydration behavior was followed by determination of free lime (FL) and combined water (Wn) contents at different curing ages. The required water for standard consistency (W/C), setting times (IST & FST), bulk density (BD) and compressive strength were also estimated. Some selected hydration products were analyzed using XRD and DTA techniques. The results showed that, both of FA and NS improve the hydration behavior and mechanical properties of the investigated cements. But, NS possesses higher improvement level than FA, due to that, both of them behaves not only as filler, but also as activator to promote pozzolanic reaction, which enhances the formation of excessive dense products. The higher beneficial role of NS is mainly due to its higher surface area, seeding effect and pozzolanic activity in comparison with FA. The composite cement containing 70.0% OPC, 26.0% FA and 4.0% NS gave the desirable mechanical properties at all curing ages.

Published in American Journal of Nano Research and Applications (Volume 4, Issue 2)
DOI 10.11648/j.nano.20160402.11
Page(s) 6-16
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), 2016. Published by Science Publishing Group

Keywords

Hydration, Mechanical Properties, Composite Cement, Fly Ash, Nanosilica, Curing Time

References
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Cite This Article
  • APA Style

    H. El-Didamony, S. Abd El-Aleem, Abd El-Rahman Ragab. (2016). Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2. American Journal of Nano Research and Applications, 4(2), 6-16. https://doi.org/10.11648/j.nano.20160402.11

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    ACS Style

    H. El-Didamony; S. Abd El-Aleem; Abd El-Rahman Ragab. Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2. Am. J. Nano Res. Appl. 2016, 4(2), 6-16. doi: 10.11648/j.nano.20160402.11

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    AMA Style

    H. El-Didamony, S. Abd El-Aleem, Abd El-Rahman Ragab. Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2. Am J Nano Res Appl. 2016;4(2):6-16. doi: 10.11648/j.nano.20160402.11

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  • @article{10.11648/j.nano.20160402.11,
      author = {H. El-Didamony and S. Abd El-Aleem and Abd El-Rahman Ragab},
      title = {Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2},
      journal = {American Journal of Nano Research and Applications},
      volume = {4},
      number = {2},
      pages = {6-16},
      doi = {10.11648/j.nano.20160402.11},
      url = {https://doi.org/10.11648/j.nano.20160402.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.nano.20160402.11},
      abstract = {In recent years, there is a great interest in replacing a long time used materials in concrete structure by nanomaterials (NMs) to produce a concrete with novel functions. NMs are used either to replace a part of cement, producing ecological profile concrete or as admixtures in cement pastes. The great reactivity of NMs is attributed to their high purities and specific surface areas. A number of NMs been explored and among of them nanosilica (NS) has been used most extensively. This work aims to study, the hydration behavior of composite cements containing fly ash (FA) and nanosilica. Different cement blends were made from OPC, FA and NS. OPC was substituted with FA up to 30.0 mass, %, then the FA portion was replaced by equal amounts of NS (2.0, 4.0 and 6.0 mass, %). The hydration behavior was followed by determination of free lime (FL) and combined water (Wn) contents at different curing ages. The required water for standard consistency (W/C), setting times (IST & FST), bulk density (BD) and compressive strength were also estimated. Some selected hydration products were analyzed using XRD and DTA techniques. The results showed that, both of FA and NS improve the hydration behavior and mechanical properties of the investigated cements. But, NS possesses higher improvement level than FA, due to that, both of them behaves not only as filler, but also as activator to promote pozzolanic reaction, which enhances the formation of excessive dense products. The higher beneficial role of NS is mainly due to its higher surface area, seeding effect and pozzolanic activity in comparison with FA. The composite cement containing 70.0% OPC, 26.0% FA and 4.0% NS gave the desirable mechanical properties at all curing ages.},
     year = {2016}
    }
    

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  • TY  - JOUR
    T1  - Hydration Behavior of Composite Cement Containing Fly Ash and Nanosized-SiO2
    AU  - H. El-Didamony
    AU  - S. Abd El-Aleem
    AU  - Abd El-Rahman Ragab
    Y1  - 2016/03/17
    PY  - 2016
    N1  - https://doi.org/10.11648/j.nano.20160402.11
    DO  - 10.11648/j.nano.20160402.11
    T2  - American Journal of Nano Research and Applications
    JF  - American Journal of Nano Research and Applications
    JO  - American Journal of Nano Research and Applications
    SP  - 6
    EP  - 16
    PB  - Science Publishing Group
    SN  - 2575-3738
    UR  - https://doi.org/10.11648/j.nano.20160402.11
    AB  - In recent years, there is a great interest in replacing a long time used materials in concrete structure by nanomaterials (NMs) to produce a concrete with novel functions. NMs are used either to replace a part of cement, producing ecological profile concrete or as admixtures in cement pastes. The great reactivity of NMs is attributed to their high purities and specific surface areas. A number of NMs been explored and among of them nanosilica (NS) has been used most extensively. This work aims to study, the hydration behavior of composite cements containing fly ash (FA) and nanosilica. Different cement blends were made from OPC, FA and NS. OPC was substituted with FA up to 30.0 mass, %, then the FA portion was replaced by equal amounts of NS (2.0, 4.0 and 6.0 mass, %). The hydration behavior was followed by determination of free lime (FL) and combined water (Wn) contents at different curing ages. The required water for standard consistency (W/C), setting times (IST & FST), bulk density (BD) and compressive strength were also estimated. Some selected hydration products were analyzed using XRD and DTA techniques. The results showed that, both of FA and NS improve the hydration behavior and mechanical properties of the investigated cements. But, NS possesses higher improvement level than FA, due to that, both of them behaves not only as filler, but also as activator to promote pozzolanic reaction, which enhances the formation of excessive dense products. The higher beneficial role of NS is mainly due to its higher surface area, seeding effect and pozzolanic activity in comparison with FA. The composite cement containing 70.0% OPC, 26.0% FA and 4.0% NS gave the desirable mechanical properties at all curing ages.
    VL  - 4
    IS  - 2
    ER  - 

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Author Information
  • Chemistry Department, Faculty of Science, Zagazig University, Zagazig Egypt

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

  • Quality Department, Lafarge Cement, El Kattamia, El Sokhna, Suez, Egypt

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