Study on notch sensitivity of fracture properties of concrete containing nano-SiO2 particles and fly ash

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 a c, K IC ini, K IC un, G F, CMOD c, and the fracture relational curves of the concrete containing nano-SiO2 and fly ash. There is a tendency of increase in a c and CMOD c with the increase of relative notch depth, while K IC ini, K IC un, and G F 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 a c, K IC ini, K IC un, G F, and CMOD c and the fracture curves are sensitive to the relative notch depth, while CTOD c may be not sensitive to the relative notch depth of the specimens of the concrete containing nano-SiO2 and fly ash. © 2013 Peng Zhang et al.