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- W4297181724 abstract "• A method to assess deterioration of concrete based on X-CT scanning ultrasonic testing and sulfate attack model is proposed. • An image processing analysis method is demonstrated to quantitatively differentiate the different constituents of concrete. • The deterioration mechanism and durability of tunnel segmental lining under sulfate attack are studied. Accurately assess the concrete deterioration of segmental lining under sulfate attack environment is important for tunnel construction and operation. Ultrasonic testing of concrete samples is generally used to determine the sulfate resistance of concrete materials. However, concrete is a porous medium material, and the internal coarse aggregate and pores will affect the sulfate attack velocity, so the ultrasonic velocity cannot directly assess the local deterioration of concrete structure under sulfate attack. In this study, the durability of concrete samples exposed to sulfate attack and wetting-drying test was studied by using the comprehensive assessment method of X-ray computed tomography (X-CT) scanning and ultrasonic testing. The ultrasonic attenuation velocity and internal pore change of deteriorated concrete were measured, and the sulfate attack depth was calculated. Test results indicate that the newly defined ultrasonic velocity after removing coarse aggregate and pores through X-CT results is a suitable index to describe the non-uniform deterioration behavior of sulfate-attacked concrete. A local deterioration assessment method of concrete structural based on X-CT, ultrasonic velocity and sulfate attack model is proposed, which provides a potential application for the deterioration assessment of sulfate-attacked tunnel segmental lining based on laboratory accelerated test results." @default.
- W4297181724 created "2022-09-27" @default.
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- W4297181724 date "2022-11-01" @default.
- W4297181724 modified "2023-10-14" @default.
- W4297181724 title "Ultrasonic and X-CT measurement methods for concrete deterioration of segmental lining under wetting-drying cycles and sulfate attack" @default.
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- W4297181724 doi "https://doi.org/10.1016/j.measurement.2022.111983" @default.
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