Fracture Properties of Concrete by using the J-integral

Title & Authors
Fracture Properties of Concrete by using the J-integral
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Abstract
Recently, the parameters, models, and experimentations, which evaluate the fracture properties of concrete, have been proposed by many researchers, and their developments allow us to analyze the non-linear and quasi-brittle fracture mechanisms. In this paper, a brief treatment of the fracture parameters was presented and the experiments of 3-point bending tests were conducted to compare J-integral($\small{J_{Ic}}$ /) with other parameters($\small{K_{Ic}}$ , $\small{G_{v}}$ , and $\small{G_{F}}$ ). The change of parameter values according to the width and notch length of concrete beam specimens was also considered. The load-displacement curves are used to experimentally measure concrete fracture toughness. From the results of experiment, it is noted that the value of $\small{GF}$ and tic decreases as the notch depth increases and $\small{G_{F}}$ is less sensitive than $\small{J_{Ic}}$ . Therefore, the former is more appropriate to use as the concrete fracture toughness parameter. The values of $\small{v_{v}}$ and $\small{J_{Ic}}$ increase when the width of concrete specimens increase from 75 mm to 150 mm. Therefore, the effects of specimen width need to be considered in determining the concrete fracture toughness.
Keywords
3-point bending test;fracture parameters;notch length;J-integral concrete fracture toughness;
Language
Korean
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