Int. J. Mol. Sci. 2012, 13(4), 4340-4350; doi:10.3390/ijms13044340
Article

Synthesis of Zinc Oxide Nanoparticles and Their Effect on the Compressive Strength and Setting Time of Self-Compacted Concrete Paste as Cementitious Composites

1,* email and 2email
Received: 30 January 2012; in revised form: 15 March 2012 / Accepted: 23 March 2012 / Published: 5 April 2012
(This article belongs to the Special Issue Composite Materials in Skeletal Engineering)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: In the present study, the mechanical properties of self-compacting concrete were investigated after the addition of different amounts of ZnO nanoparticles. The zinc oxide nanoparticles, with an average particle size of about 30 nm, were synthesized and their properties studied with the help of a scanning electron microscope (SEM) and X-ray diffraction. The prepared nanoparticles were partially added to self-compacting concrete at different concentrations (0.05, 0.1, 0.2, 0.5 and 1.0%), and the mechanical (flexural and split tensile) strength of the specimens measured after 7, 14, 21 and 28 days, respectively. The present results have shown that the ZnO nanoparticles were able to improve the flexural strength of self-compacting concrete. The increased ZnO content of more than 0.2% could increase the flexural strength, and the maximum flexural and split tensile strength was observed after the addition of 0.5% nanoparticles. Finally, ZnO nanoparticles could improve the pore structure of the self-compacted concrete and shift the distributed pores to harmless and less-harmful pores, while increasing mechanical strength.
Keywords: zinc oxide nanoparticles; cement paste; compressive strength; workability
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MDPI and ACS Style

Arefi, M.R.; Rezaei-Zarchi, S. Synthesis of Zinc Oxide Nanoparticles and Their Effect on the Compressive Strength and Setting Time of Self-Compacted Concrete Paste as Cementitious Composites. Int. J. Mol. Sci. 2012, 13, 4340-4350.

AMA Style

Arefi MR, Rezaei-Zarchi S. Synthesis of Zinc Oxide Nanoparticles and Their Effect on the Compressive Strength and Setting Time of Self-Compacted Concrete Paste as Cementitious Composites. International Journal of Molecular Sciences. 2012; 13(4):4340-4350.

Chicago/Turabian Style

Arefi, Mohammad Reza; Rezaei-Zarchi, Saeed. 2012. "Synthesis of Zinc Oxide Nanoparticles and Their Effect on the Compressive Strength and Setting Time of Self-Compacted Concrete Paste as Cementitious Composites." Int. J. Mol. Sci. 13, no. 4: 4340-4350.

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