Effect of Temperature and Number of Heating–Cooling Cycles on the Mode I, Mode II and the Mixed-Mode I-II Fracture Toughness of concrete

Document Type : Research Article

Authors

1 Imam Khomeini International University

2 Imam Khomeini international university

Abstract

In this research, the effects of temperature and number of heating-cooling cycles on mode I, mode II and the effective value of the mixed-mode I-II fracture toughness of concrete were investigated through two series of tests. In the first series of tests, the effect of temperature was studied in a heating-cooling cycle at ambient temperature (25 °C) and 60, 150, 200, 300, 500, and 700 °C. The highest and lowest mode I, mode II and the effective value of the mixed-mode I-II fracture toughness were, respectively, observed at 150 and 700°C. In the second series of tests, the effect of the number of heating-cooling cycles was investigated on mode I, mode II and the effective value of the mixed-mode I-II fracture toughness of concrete specimens at 150°C and a crack inclination angle of 45°. According to the results, mode I, mode II and the effective value of the mixed-mode I-II fracture toughness increased in the first cycle and decreased with increasing the number of heating-cooling cycles. As the crack inclination increased, the effective value of the mixed-mode I-II fracture toughness of the concrete specimens increased. The mode II fracture toughness increased up to a crack inclination angle of 45° and then decreased. Moreover, with increasing the crack inclination angle, the mode I fracture at the inclination angle of 0° was changed into the mixed-mode (tension–shear) fracture at inclination angles smaller than 28.8°. The mixed-mode tension–shear fracture was changed into the mixed-mode compressive–shear fracture at crack inclination angles larger than 28.8°.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 1
April 2022
Pages 141-164

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