Abstract
This paper shows how the double-K fracture parameters K iniIc and K unIc can be determined for concrete using CT-specimens and wedge splitting specimens. The experimental results collected from the fracture tests the very large size CT-specimens and small size wedge splitting specimens carried out by many researchers are utilized to investigate the characters of the obtained double-K fracture parameters K iniIc and K unIc . It was found that the double-K fracture parameters K iniIc and K unIc determined from fracture tests on the large size CT-specimens are size-independent. And the values of K iniIc and K unIc determined from small size wedge splitting specimens with same dimensions are independent of the relative preformed notch length a0/D. However, when the dimensions of small size wedge splitting specimens change from 150×150×150 mm3 to 450×450×450 mm3, the values of K iniIc and K unIc slightly depend on the heights of the specimens and do not depend on the thickness of the specimens.
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Xu, S., Reinhardt, H.W. Determination of double-K criterion for crack propagation in quasi-brittle fracture, Part III: Compact tension specimens and wedge splitting specimens. International Journal of Fracture 98, 179–193 (1999). https://doi.org/10.1023/A:1018788611620
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DOI: https://doi.org/10.1023/A:1018788611620