Performance of Cement Asphalt Mortar in Ballastless Slab Track over High-Speed Railway under Extreme Climate Conditions

Wang, Jinfeng; Zhou, Yubing; Wu, Tian-mei; Wu, Xi

doi:10.1061/(asce)gm.1943-5622.0001419

Cited by 41 publications

(18 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…Nevertheless, some problems inevitably occur in track substructures due to the coupling effect of the trainload and environmental actions [4][5][6][7]. In particular, the HSR network covers a vast territory, and slab track is constructed all over the world at places with different weather conditions, e.g., great annual temperature difference, great daily temperature difference, and continuous high temperature [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…On-site observations of in-service HSR lines show that deterioration in slab tracks and the structural damages are frequently reported on the substructures of slab track during the high-temperature period [8]. Such damages may reduce the constraint between different layers of slab tracks, increase track irregularity level, and induce abnormal vibration of the vehicle-track system [9]. If structure damages remain undetected and unrepaired, they may eventually cause complete fracture of the track system and jeopardize operational safety.…”

Section: Introductionmentioning

confidence: 99%

“…To investigate how track slab damages initiate and how they affect vehicle-track system dynamics and track irregularities, previous studies carried out numerical simulations [3][4][5][6][7][8][10][11][12][13][14][15][16], full-scale tests [9,[17][18][19], and field tests [15,20,21]. These studies shed some light on repair works for defects, slab maintenance, and life-cycle management of slab track.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Liu

2019

Sensors

View full text Add to dashboard Cite

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.

show abstract

Section: Temperature-induced Slab Defects and Warping Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Liu

2019

Sensors

View full text Add to dashboard Cite

show abstract

“…Among them, the CRTSⅢ ballastless track on the bridge adopts the unit block structure where there is an intermediate isolation layer between the baseplate and the selfcompacting concrete (SCC) layer, and using the limit barricade to transmit the longitudinal and lateral forces of the track [3]; As for the steel spring floating slab track, it floats the concrete slab with a certain quality and stiffness on the steel spring isolator, 30mm away from the top surface of the base cushion, which forms the mass-spring-foundation isolation system [4]. Domestic and foreign scholars have carried out extensive and profound researchs on the mechanics and deformation performance of ballastless track under the action of trains, including foundations and situations such as subgrade [5], simple-supported bridge and steel-concrete bridge [6], seismic response [7], mortar layer separation [8][9], track slab structure voiding [10], damage induced by temperature stress [11] and the CRTS series track types [12][13]. The vibration and impact of the system can be greatly reduced due to CWR on the bridge using ballastless track.…”

Section: Introductionmentioning

confidence: 99%

Vertical Dynamic Analysis of Ballastless Tracks on Train-Track- Bridge System

2020

View full text Add to dashboard Cite

In order to investigate the vertical dynamic response characteristics of train-track-bridge system on CWR (Continunously Welded Rail) under dynamic load of train on HSR (High-Speed Railway) bridge. Based on the principle of vehicle train-track-bridge coupling dynamics, taking the 32m simply supported bridge of a section of Zhengzhou-Xuzhou Passenger Dedicated Line as an example, the finite element software ANSYS and the dynamic analysis software SIMPACK are used for co-simulation, and bridge model of the steel spring floating slab track and the CRTSIII ballastless track (China Railway Track System) considering the shock absorbing steel spring, the limit barricade and the contact characteristics of track structure layers are established. On this basis, in order to study the dynamic response laws of the design of ballastless track structure parameters to the system when the train crosses the bridge and provide the basis for the design and construction, by studying the influence of the speed of train on the bridge, the damage of fasteners and the parameters of track structure on the train-track-bridge system, the displacement of rail, vertical vibration acceleration and wheel-rail force response performance are analyzed. Studies have shown that: At the train speed of 40 km/h, the displacement and acceleration of the rail and track slab in the CRTSIII ballastless track are smaller than the floating slab track structure, but the floating slab track structure has better vibration reduction performance for bridges. The acceleration of rail, track slab and bridge increases obviously with the increase of train speed, the rail structure has the largest increasement. Reducing the stiffness of fasteners could decrease the vertical acceleration response of the steel spring floating slab track system, the ability to absorb shock can be enhanceed by reducing the stiffness of the fastener appropriately. Increasing the density of the floating slab can increase the vertical acceleration of the floating slab and the bridge, thereby decreasing the vibration amplitude of the system.

show abstract

Use and Prospects of Concrete as a Cementitious Material

Bhattacharyya

Deb

2022

Future Landscape of Structural Materials in India

View full text Add to dashboard Cite

Performance of Cement Asphalt Mortar in Ballastless Slab Track over High-Speed Railway under Extreme Climate Conditions

Cited by 41 publications

References 15 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

Vertical Dynamic Analysis of Ballastless Tracks on Train-Track- Bridge System

Use and Prospects of Concrete as a Cementitious Material

Contact Info

Product

Resources

About