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Article Number - 9BCC81A49374


Vol.9(24), pp. 1003 - 1118 , December 2014
DOI: 10.5897/SRE2014.6001
ISSN: 1992-2248



Full Length Research Paper

Influence of nanosilica and a polycarboxylate superplasticizer on the rheological and electrokinetical properties of cement pastes



Madjid Samar
  • Madjid Samar
  • Research Unit, Materials, Processes and Environment (UR/MPE), Faculty of Engineering, University M?Hamed Bougara Boumerdes, Algeria.
  • Google Scholar
Abdelbaki Benmounah
  • Abdelbaki Benmounah
  • Research Unit, Materials, Processes and Environment (UR/MPE), Faculty of Engineering, University M?Hamed Bougara Boumerdes, Algeria.
  • Google Scholar
Brahim Safi
  • Brahim Safi
  • Research Unit, Materials, Processes and Environment (UR/MPE), Faculty of Engineering, University M?Hamed Bougara Boumerdes, Algeria.
  • Google Scholar
Rabia Kheribet
  • Rabia Kheribet
  • Research Unit, Materials, Processes and Environment (UR/MPE), Faculty of Engineering, University M?Hamed Bougara Boumerdes, Algeria.
  • Google Scholar
Mohammed Saidi
  • Mohammed Saidi
  • Research Unit, Materials, Processes and Environment (UR/MPE), Faculty of Engineering, University M?Hamed Bougara Boumerdes, Algeria.
  • Google Scholar







 Received: 07 June 2014  Accepted: 05 December 2014  Published: 30 December 2014

Copyright © 2014 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


The effect of individual and combined addition of both nanosilica (NS) and polycarboxylate ether plasticizer (PCE) admixtures on cements pastes was studied. The sole incorporation of NS increased the water demand, as proved by the mini-spread flow test. An interaction between NS and hydrated cement particles was observed in fresh mixtures by means of particle size distribution studies, zeta potential measurements and optical microscopy, giving rise to agglomerates. On the other hand, the addition of PCE to a cement paste increased the flowability and accelerated the setting process. PCE was shown to act in cement media as a deflocculating agent, reducing the particle size of the agglomerates through a steric hindrance mechanism. Mechanical strengths were improved in the presence of either NS or PCE, the optimum being attained in the combined presence of both admixtures that involved relevant microstructural modifications, as proved by pore size distributions and SEM observations. The results indicate also the effectiveness of NS and polycarboxylate superplasticizer in producing high packing density and in accelerating the pozzolanic activity to produce more C-S-H gel by consuming calcium hydroxide Ca(OH)2 in order to improve the mechanical properties of cement pastes.
 
Key words: Cement pastes, polycarboxylate plasticizer, nanosilica, optical microscopy, rheological and electrokinetical properties.

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APA Samar, M., Benmounah, A., Safi, B., Kheribet, R., & Saidi, M. (2014). Influence of nanosilica and a polycarboxylate superplasticizer on the rheological and electrokinetical properties of cement pastes. Scientific Research and Essays, 9(24), 1003 - 1118.
Chicago Madjid Samar, Abdelbaki Benmounah, Brahim Safi, Rabia Kheribet and Mohammed Saidi. "Influence of nanosilica and a polycarboxylate superplasticizer on the rheological and electrokinetical properties of cement pastes." Scientific Research and Essays 9, no. 24 (2014): 1003 - 1118.
MLA Madjid Samar, et al. "Influence of nanosilica and a polycarboxylate superplasticizer on the rheological and electrokinetical properties of cement pastes." Scientific Research and Essays 9.24 (2014): 1003 - 1118.
   
DOI 10.5897/SRE2014.6001
URL http://www.academicjournals.org/journal/SRE/article-abstract/9BCC81A49374

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