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Showing 2 results for Ultrasonic Wave

, Hassan Moomivand, ,
Volume 10, Issue 1 (8-2016)
Abstract

Non-destructive methods such as ultrasonic wave velocity are extensively used for estimating physical and mechanical properties of rock due to the simplicity, economical, fast and harmless nature. Rock constructions have been made worldwide from past to present. Determination of strength of rock constructions such as archeological evidence is not possible using conventional rock strength tests. Developing a cheap, simple, non-destructive, efficient and accurate method to estimate the strength of such constructions can be useful. Rock blocks and constructions have various shapes and sizes. Rock blocks having various shapes and sizes have been prepared from marble, travertine, granite, and limestone and ultrasonic wave velocity at various directions of the blocks dimensions and the uniaxial compressive strength of cylindrical core obtained from the blocks have been measured. The results show that shapes and sizes have no effect on the ultrasonic wave velocity. At the end relationships between uniaxial compressive strength and ultrasonic wave velocity have been determined. The uniaxial compressive strength of blocks and rock constructions can be estimated by the obtained relationships using non-destructive, simple and indeed low cost method of ultrasonic wave velocity.


Ms. Somayeh Arab-Ameri, Dr. Davood Fereidooni,
Volume 17, Issue 1 (3-2023)
Abstract

Ultrasonic wave velocity testing is a non-destructive, economical, simple and rapid method used for determining the physical and engineering properties of rock. This test is based on the velocity of the elastic wave in rocks. The ultrasonic wave velocity of rocks depends on intrinsic and environmental properties such as mineralogical composition, density, porosity, grain size, shape, texture, anisotropy, water content, and temperature of rocks. In this research, 10 different types of building stone, including limestone and granite, were cut into 50 cubic specimens with dimensions of 10Í4Î4 cm, and then they were tested using the Pandit wave velocity testing machine to find the effective parameters on the velocity of the ultrasonic wave should be investigated in them. These parameters include dry unit weight, temperature, type of pore fluid, state of filling material and loading. Based on the obtained results, the correlation between ultrasonic wave velocity and dry unit weight is a direct linear relationship and its relationship with the type of pore fluid condition of the filling material and loading is inverse relationship. In addition, increasing the temperature increases the velocity of the ultrasonic wave. Also, in terms of the type of pore fluid, the lowest value of the wave velocity was obtained in the state saturated with water and the highest value of the wave velocity was obtained in the common salt solution with a concentration of 150%. Regarding the state of the rock pore filling material, the highest velocity value was observed in the frozen filling state and the lowest velocity value was observed in the air filling state. As the load increases, the velocity of the ultrasonic waves decreases in the studied rocks.


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