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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 K ini, the critical fracture toughness K ic and the fracture energy G F were calculated. The results demonstrated that K ini decreased monotonically with increasing heating temperature T m; K ic and G F sustained a hold-increase–decrease tendency with T m. Furthermore, the characteristic length l ch, a brittleness parameter, was calculated and it shared the same tendency as K ic–T m and G F–T m. 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 K ini, the critical fracture toughness K ic and the fracture energy G F were calculated. The results demonstrated that K ini decreased monotonically with increasing heating temperature T m; K ic and G F sustained a hold-increase–decrease tendency with T m. Furthermore, the characteristic length l ch, a brittleness parameter, was calculated and it shared the same tendency as K ic–T m and G F–T m. 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)
Materials and Structures ; 45 ; 1155-1165
2012-01-24
11 pages
Article (Journal)
Electronic Resource
English
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