A feasibility study on void detection of cement-emulsified asphalt mortar for slab track system utilizing measured vibration data

The contact loss beneath track slab caused by deteriorated cement emulsified asphalt mortar (CA mortar) has been one of the main diseases occurring in the CRTS- (China Railway Track System-) I Slab Track of high-speed railway in China. Based on the slab track design theory and the vehicle-track coupling vibration theory, a vehicle-track vertical coupling dynamic FEM model was established to analyze the influence of the contact loss length on the dynamic characteristics of vehicle and track subsystems at different train speeds. A prototype dynamic characteristic experimental test of CRTS-I Slab Track with CA mortar contact loss was conducted to verify the FEM model results. The train load was generated by the customized ZSS50 excitation car. The results showed that when the operation speed is less than 300 km/h, the contact loss with length smaller than 2.0 m barely affects the running smoothness ride safety of vehicle. The contact loss length effect on the dynamic characteristics of track subsystem is pronounced, especially on the track slab. Once the contact loss beneath the track slab occurs, the vibration displacement and the acceleration of the track slab increase rapidly, while it has little influence on the displacement and acceleration of the concrete roadbed.

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Viscoelastic deformation behavior of cement and emulsified asphalt mortar in China railway track system I prefabricated slab track

Journal of Zhejiang University SCIENCE A ◽

10.1631/jzus.a1900525 ◽

2020 ◽

Vol 21 (4) ◽

pp. 304-316 ◽

Cited By ~ 3

Author(s):

Juan-juan Ren ◽

Hao-lan Li ◽

Xiao-pei Cai ◽

Shi-jie Deng ◽

Ji Wang ◽

...

Keyword(s):

Deformation Behavior ◽

Railway Track ◽

Viscoelastic Deformation ◽

Slab Track ◽

Track System ◽

China Railway ◽

Emulsified Asphalt ◽

Asphalt Mortar

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Analysis of Cement Emulsified Asphalt Mortar Gap on CRTSII Slab Track under Train Loading

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.1834 ◽

2013 ◽

Vol 405-408 ◽

pp. 1834-1838 ◽

Cited By ~ 2

Author(s):

Hao Xu ◽

Wang Ping ◽

Jing Mang Xu

Keyword(s):

Finite Element ◽

Beam Theory ◽

Railway Track ◽

Slab Track ◽

Finite Element Software ◽

Track System ◽

Stress And Deformation ◽

Emulsified Asphalt ◽

Ca Mortar ◽

Asphalt Mortar

The finite element method was used to analyze the deformation and stress of track in different length and height of gaps under the train load. In order to study the influence of gap between the slab and emulsified cement asphalt mortar of china railway track system II slab track on the subgrade, a model of CRTS II slab track was established on the base of elastic foundation beam theory and finite element software ANSYS. The results show that gap between slab and CA mortar has significance effect on the stress and deformation of track structure. The deformation of rail and slab, the longitudinal stress of slab were increase with the increase of gap length, but has less effect on lateral stress of slab. When the length of gap exceed to 1.95m, the deformation and stress have the tendency of increase sharply, the length of gap between slab and CA mortar should not exceed 1.95m. The gap between slab and CA mortar has effect on the durability and lifetime of ballastless track, so the gap should be maintenance timely.

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The Key Technologies for Construction Quality Control of Cement Emulsified Asphalt Mortar of CRTS Ballastless Slab Track for High-Speed Railway

Sustainable Transportation Systems ◽

10.1061/9780784412299.0065 ◽

2012 ◽

Cited By ~ 5

Author(s):

Liangwei Lou ◽

Yan Cheng ◽

Changhua Zhu ◽

Xinhua Zhong

Keyword(s):

Quality Control ◽

High Speed ◽

Construction Quality ◽

High Speed Railway ◽

Slab Track ◽

Key Technologies ◽

Emulsified Asphalt ◽

Asphalt Mortar

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Experimental Investigation of Stochastic Mechanical Behavior of Cement Emulsified Asphalt Mortar under Monotonic Compression

Applied Sciences ◽

10.3390/app10082860 ◽

2020 ◽

Vol 10 (8) ◽

pp. 2860

Author(s):

Xiao Li ◽

Zhiwu Yu ◽

Peng Liu ◽

Zhi Shan ◽

Zilong Meng

Keyword(s):

Experimental Investigation ◽

Constitutive Relationship ◽

Railway Track ◽

Mechanical Responses ◽

Distribution Density Function ◽

Track System ◽

Emulsified Asphalt ◽

Stochastic Properties ◽

Ca Mortar ◽

Asphalt Mortar

Experimental investigation on cement emulsified asphalt mortar (CA mortar) under uniaxial monotonic compression by taking into account the stochastic properties were investigated. An analytical constitutive model based on the statistic damage approach capable of mimicking the stochastic mechanical responses of CA mortar under uniaxial compression was proposed. The comparison between the experimental results and the predictions demonstrated that the proposed model was able to characterize the salient features for CA mortar under uniaxial monotonic compression. Furthermore, the compressive stochastic evolution (SE) of CA mortar tested in this work and comparative analyses among typical China Railway Track System-I (CRTS-I) type CA mortar and concrete in several aspects were examined and performed; it was revealed that the Lognormal distribution density function can well represent the damage probability density for CA mortar, and its stochastic constitutive relationship can be reflected by a media process of transition from microscale to macroscale.

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