Abstract
The deterioration mechanism and dynamic tensile properties of rock subjected to the effects of freeze-thaw cycles are investigated in this study. Brazilian disc granite specimens are treated by 0, 30, 60, 90 and 120 freeze-thaw cycles. Freezing and thawing temperatures are −20 °C and 20 °C respectively. The microscopic damage in the rock samples induced by freeze-thaw treatment is detected by the nuclear magnetic resonance (NMR) technique. T2 spectrum and magnetic resonance imaging (MRI) are used to analyze the effect of freeze-thaw cycles on the pore structure of rock samples. Brazilian splitting tests are performed by a split Hopkinson pressure bar (SHPB) system to measure the dynamic tensile strength of granite and to investigate the effect of freeze-thaw cycles on the dynamic tensile strength and the dynamic mechanical behavior. A formula for dynamic tensile strength prediction considering loading rates and freeze-thaw cycles is presented to quantify the results. The dynamic failure process of specimen is observed by a high-speed camera, it was found that the rock materials were more susceptible to damage and deteriorate after freeze-thaw treatment compared with the untreated rock.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
