Experimental study on interfacial damage characteristics of CRTS II slab track and CA mortar with AE and DIC techniques

Qin, Lei; Guo, Chengchao; Sun, Wei; Zhang, Mingxu; Chu, Xuanxuan; Wang, Fuming

doi:10.1016/j.engfailanal.2022.106777

Cited by 22 publications

(3 citation statements)

References 39 publications

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“…Specifically, at measurement point 1, the surface hardness of the model exhibits the highest growth rate, which is 11.61%. Furthermore, within the contact region (measurement points 1-19), the average surface hardness increase percentage is 8.29%, while at other locations beyond this region (measurement points [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], the average hardness growth rate is only 1.53%. Nevertheless, after enduring 100 freeze-thaw cycles, the average surface hardness of the model before the impact decreased by 18.9% compared to the not frozen-thawed model, and the magnitude of surface hardness growth of the model becomes more pronounced, as shown in Fig.…”

Section: Hardness Results Of the Track Slabs Impact Surfacementioning

confidence: 99%

“…Moreover, within the contact region (measurement points 1-19), the wave velocity average decrease is significant, with a value of 5.08%. But at other measurement points beyond this region (measurement points [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], the average decrease is only 1.23%. However, after undergoing 100 freeze-thaw cycles, the average wave velocity of the model before the impact decreased by 24.25% compared to the not frozen-thawed model.…”

Section: Wave Velocity Results Of the Track Slabsmentioning

confidence: 99%

“…Consequently, the detection of concrete damage has emerged as a significant research field. Currently, various non-destructive testing (NDT) methods are available for concrete evaluation, including the Coin tap test, Acoustic Emission (AE), Impact Echo testing, ground-penetrating radar, Digital Image Correlation (DIC), and ultrasonic pulse velocity [25][26][27][28][29][30][31] . The Coin tap test, as a simple pulse-echo method, represents one of the oldest NDT techniques.…”

mentioning

confidence: 99%

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Non-destructive evaluation method for track slabs damaged by impact of ice blocks detached from high-speed trains

Song,

Fu,

Xiao

et al. 2024

Sci Rep

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In winter snowy or rainy weather, the phenomenon of icing under rolling stock during high-speed operation is significantly severe, posing a potential risk of detachment and impact on track structures due to the presence of ice blocks with substantial mass and velocity. Therefore, it is crucial to develop an efficient method for characterizing and evaluating this impact damage in order to assess the service life of the track. To address this issue, the indoor ice impact tests were conducted on track slab models, and a comprehensive analysis was performed on non-destructive testing data before and after the impact test, including 3D surface morphology assessment, surface hardness and wave velocity measurements. Additionally, in order to verify the effectiveness of the nondestructive testing method, the frozen-thawed and not frozen-thawed track slab models were tested and their results were compared. The experimental results revealed that when impacted by ice blocks at a velocity of 100 m/s, small dimples formed on the surface of track slab models with the maximum depth measured at 0.0694 mm. There was a maximum increase rate in surface hardness amounting to 11.61%, and a maximum decrease rate in wave velocity measuring at 6.52%. Furthermore, the impact damage of the two models has been evaluated, the not frozen-thawed track slab model exhibited minor damage after impact, whereas the frozen-thawed track slab model demonstrated moderate damage in the contact region and minor damage outside of that region. The proposed non-destructive testing method effectively enables assessing the impact damage inflicted upon slab models while providing valuable insights for maintenance and repair strategies related to track slabs.

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