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Residual fracture properties of concrete subjected to elevated temperatures
Abstract Investigations on the residual Mode-I fracture behaviors of concrete subjected to elevated temperatures were carried out. Test specimens with the same dimensions, 230 × 200 × 200 mm, were exposed to temperatures varying from 65 to 600°C. The wedge splitting method was employed to obtain the complete load-crack mouth opening displacement curves (P–CMOD) of the post-fire specimens, from which the initial fracture toughness Kini, the critical fracture toughness Kic and the fracture energy GF were calculated. The results demonstrated that Kini decreased monotonically with increasing heating temperature Tm; Kic and GF sustained a hold-increase–decrease tendency with Tm. Furthermore, the characteristic length lch, a brittleness parameter, was calculated and it shared the same tendency as Kic–Tm and GF–Tm. Thus, any of the three parameters could serve as the index of brittleness for post-fire concrete. The fracture parameters and other material properties of concrete could be closely related to the ultimate weight loss.
Residual fracture properties of concrete subjected to elevated temperatures
Abstract Investigations on the residual Mode-I fracture behaviors of concrete subjected to elevated temperatures were carried out. Test specimens with the same dimensions, 230 × 200 × 200 mm, were exposed to temperatures varying from 65 to 600°C. The wedge splitting method was employed to obtain the complete load-crack mouth opening displacement curves (P–CMOD) of the post-fire specimens, from which the initial fracture toughness Kini, the critical fracture toughness Kic and the fracture energy GF were calculated. The results demonstrated that Kini decreased monotonically with increasing heating temperature Tm; Kic and GF sustained a hold-increase–decrease tendency with Tm. Furthermore, the characteristic length lch, a brittleness parameter, was calculated and it shared the same tendency as Kic–Tm and GF–Tm. Thus, any of the three parameters could serve as the index of brittleness for post-fire concrete. The fracture parameters and other material properties of concrete could be closely related to the ultimate weight loss.
Residual fracture properties of concrete subjected to elevated temperatures
Yu, Jiangtao (author) / Yu, Kequan (author) / Lu, Zhoudao (author)
2012
Article (Journal)
English
Residual fracture properties of concrete subjected to elevated temperatures
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Residual fracture properties of concrete subjected to elevated temperatures
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Residual fracture properties of concrete subjected to elevated temperatures
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Residual fracture properties of concrete subjected to elevated temperatures
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