Experimental Investigation of the Physical Properties and Microstructure of Slate under Wetting and Drying Cycles Using Micro-CT and Ultrasonic Wave Velocity Tests.

Published on Aug 27, 2020in Sensors3.275
· DOI :10.3390/S20174853
Junwei Ma6
Estimated H-index: 6
Xiaoxu Niu3
Estimated H-index: 3
+ 4 AuthorsTang Huiming (China University of Geosciences (Wuhan))
Cyclic wetting and drying processes have been considered as important factors that accelerate the weathering process and have deteriorative effects on rock properties. In the present study, a fully nondestructive and noninvasive testing approach utilizing micro-CT and ultrasonic wave velocity tests was employed to investigate the microstructure of slate under wetting and drying cycles. We studied variations in the physical properties, including the dry weight and the velocities of P- and S-waves versus the number of wetting and drying cycles. The internal microstructural distributions were visualized and quantified by the 3D reconstruction and hybrid image segmentation of CT images. The degree of deterioration caused by wetting and drying cycles was reflected by exponential decreases of physical properties, including dry weight and velocities of the P- and S-waves. Parameters relating to the microfracture diameter, volume, etc. were quantified. The nondestructive and noninvasive testing approach utilizing micro-CT and ultrasonic wave velocity tests has potential for the detection and visualization of the internal microstructure of rock under wetting and drying cycles.
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We greatly appreciate the financial support of the National Natural Science Foundation of China [Grant No. 51909225]; National Science and Technology Major Project of China [Grant No. 2017ZX05013001-002]; and the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences [Grant No. Z017009]. The authors also acknowledge financial support from China Scholarship Council.
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