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Journal of Nanomaterials
Volume 2013, Article ID 381682, 7 pages
http://dx.doi.org/10.1155/2013/381682
Research Article

Study on Notch Sensitivity of Fracture Properties of Concrete Containing Nano-SiO2 Particles and Fly Ash

1School of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001, China
2Department of Civil Engineering, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China

Received 23 October 2013; Accepted 13 November 2013

Academic Editor: Hui Xia

Copyright © 2013 Peng Zhang et al. 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

The fracture parameters and fracture relational curves of the concrete containing nano-SiO2 and fly ash with different relative notch depth of the notched beam specimens were measured by means of three-point bending method. The results indicate that the relative notch depth of the notched specimens has great effect on , , , , , and the fracture relational curves of the concrete containing nano-SiO2 and fly ash. There is a tendency of increase in and with the increase of relative notch depth, while , , and are decreasing gradually with the increase of relative notch depth of the notched beam specimens. Besides, when the relative notch depth increases from 0.2 to 0.5, the nonlinear stage of the curve becomes shorter and shorter, and the descent stage of the curve becomes sharper and sharper. The fracture parameters of , , , , and and the fracture curves are sensitive to the relative notch depth, while may be not sensitive to the relative notch depth of the specimens of the concrete containing nano-SiO2 and fly ash.