Experimental Study on Bond Performances of Track Slab and Mortar Based on DIC Technology

Su, Chengguang; Liú, Dan; Chenxu, Ding; Chuang, Gong; Zhao, Pingrui; Liu, Xueyi

doi:10.1007/s12205-018-0848-2

Cited by 29 publications

(15 citation statements)

References 6 publications

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“…It was found by Zhu and Cai [6] that the temperature difference between the top and bottom surfaces of track slab can reach over 16 • C. The temperature gradient load induced by the great temperature differential may result in the generation of pulling and curling stresses in the prefabricated concrete slabs [32] and structural defects. Typical temperature-induced slab track defects include interface debonding/delamination between CA mortar and track slab [4,7,12,18,25,26,32,39], decreased compressive strength, cracking and damage of CA mortar [9,15,16,33,35,[40][41][42], wide and narrow juncture defects [8], warping deformation of track slab [13,16,26,38], etc.…”

Section: Temperature-induced Slab Defects and Warping Deformationmentioning

confidence: 99%

“…A straightforward method of damage detection for slab track is regular visual inspection or non-destructive testing (NDT) methods [20][21][22][23][24][25][26][27][28]. The NDT techniques are powerful in damage detection for concrete structures, especially in structural health monitoring of bridges [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…The NDT techniques are powerful in damage detection for concrete structures, especially in structural health monitoring of bridges [29][30][31]. The NDT techniques adopted in ballastless railway detection mainly includes impact-echo method [21,23,24], ground-penetrating radar (GPR) [21], digital image correlation (DIC) [25,26] and synthetic aperture focusing technique (SAFT) ultrasound imaging method [27,28]. They can detect specific slab defects and report the size and even geometry of defects through customized devices.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Liu

2019

Sensors

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Slab track is widely used in many newly built high-speed rail (HSR) lines as it offers many advantages over ballasted tracks. However, in actual operation, slab tracks are subjected to operational and environmental factors, and structural damages are frequently reported. One of the most critical problems is temperature-induced slab-warping deformation (SWD) which can jeopardize the safety of train operation. This paper proposes an automatic slab deformation detection method in light of the track geometry measurement data, which are collected by high-speed track geometry car (HSTGC). The characteristic of track vertical irregularity is first analyzed in both time and frequency domain, and the feature of slab-warping phenomenon is observed. To quantify the severity of SWD, a slab-warping index (SWI) is established based on warping-sensitive feature extraction using discrete wavelet transform (DWT). The performance of the proposed algorithm is verified against visual inspection recorded on four sections of China HSR line, which are constructed with the China Railway Track System II (CRTSII) slab track. The results show that among the 24,806 slabs being assessed, over 94% of the slabs with warping deformation can be successfully identified by the proposed detection method. This study is expected to provide guidance for efficiently detecting and locating slab track defects, taking advantage of the massive track inspection data.

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Section: Temperature-induced Slab Defects and Warping Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Liu

2019

Sensors

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“…In recent decades the self-compacting concretes have been in demand in transport and underground construction [1][2][3][4]. They are characterized by the ability to spread and condense under their own weight and fill the formwork with thick reinforcement, channels and other places where it is difficult to use traditional compaction with vibration [5,6].…”

Section: Introductionmentioning

confidence: 99%

Technological Properties of Self-Compacting Concrete Mixtures with Ground Quartz Sand

Kazanskaya¹,

Fadeeva²,

Isakovsky³

2019

IJITEE

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Quantitative parameters of influence of grain composition of ground quartz sand and its quantity on the workability and segregation of self-compacting fresh concrete were determined at the constant amount of mixing water and water-cement ratio. Ground quartz sand in the amount of 50-150 kg/m3 was added instead of fine and coarse aggregates with changing the amount of polycarboxylate superplasticizer. It is stated that the use of ground quartz sand of finer grinding provides higher values of workability at the same quantity of water and superplasticizer. Segregation of the fresh concrete occurs when using increased amount of ground quartz sand of coarser grinding and increased amount of superplasticizer. Experimental studies have shown the effectiveness of the use of ground quartz sand to obtain self-compacting fresh concrete of different classes of workability SF1 and SF2 as well as classes of segregation resistance SR1 and SR2. The results of the experiments allow to state that the use of ground quartz sand of coarser grinding leads to segregation of fresh concrete at its low workability, while the use of ground quartz sand of finer grinding allows to obtain fresh concrete with resistance to segregation.

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“…Chen et al [34] used 3D-DIC to elucidate the effect of aggregate size and volume on the nonuniform strain distribution in concrete. Su et al [35] studied the stress-strain relationship and cohesion model parameters in concrete-and mortarbonded composite specimens from the interface displacement and distribution of strain.…”

Section: Introductionmentioning

confidence: 99%

Application of DICM on Similar Material Simulation Experiment for Rock-Like Materials

Kong

Wang

et al. 2018

Advances in Civil Engineering

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e digital image correlation method (DICM) has been applied to similar material simulation experiments for rock-like materials, to overcome the weakness of traditional measurements, for example, data discontinuous. In this paper, the movement and fracturing process of the overlying strata during excavation are observed and studied, and the distributions of stress, strain, and deformation in the overlying strata are obtained based on similar material simulation. e DICM is applied to improve the testing method and to optimize the discontinuity of testing points; of course, the difference of rock deformation in the overlying strata during excavation is considered. Full-field deformation and strain are analyzed by the DICM. To verify the accuracy of the DICM, results obtained from the DICM, numerical simulation and similar material simulation, are compared. e DICM can reflect the characteristics of locality and randomness of rock-like materials more real than numerical simulation, and comparing with similar material simulation, it can directly reproduce the movement and fracturing process of the overlying strata during full-field excavation. It shows that, the DICM is entirely feasible to using in the large scale full-field deformation measurement on complex rock structure, and it is of theoretical importance for testing for rock-like materials.

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Experimental Study on Bond Performances of Track Slab and Mortar Based on DIC Technology

Cited by 29 publications

References 6 publications

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Technological Properties of Self-Compacting Concrete Mixtures with Ground Quartz Sand

Application of DICM on Similar Material Simulation Experiment for Rock-Like Materials

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