Thermal evolution of CRTS Ⅱ slab track under various environmental temperatures: Experimental study

Zhou, Rui; Zhu, Xuan; Ren, Wei‐Xin; Zhou, Zhixiang; Yao, Guowen; Ma, Cong; Du, Yanliang

doi:10.1016/j.conbuildmat.2022.126699

Cited by 37 publications

(5 citation statements)

References 24 publications

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“…To investigate the restraining capacity of the CA mortar layer on the track slab, the following theory is introduced. According to the theoretical longitudinal displacement methods for the track slab (Zhou et al, 2022), the theoretical longitudinal displacement of the track slab with a length of 8 m for the free specimen can be calculated by Eq. ( 1).…”

Section: Structural Stress Of Ballastless Trackmentioning

confidence: 99%

Experimental and Numerical Investigations of Structural Performance of Slab Track under Hygrothermal Environment

Song¹,

Yao²,

Yu³

et al. 2023

JJCE

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The coupled heat and moisture actions could easily cause deformation, cracking and corrosion problems in the slab ballastless track under operational conditions via China Railway Track System (CRTS) Ⅱ. In this paper, two one-quarter-scaled models of CRTS Ⅱ slab ballastless track under hygro-thermal environment were tested in a testing chamber, respectively. To study the effect of constrained conditions on the structural performance of track structure, temperature distribution, stress and displacement of two scaled models with constrained and free boundary conditions were also compared. Then, the temperature and stress field of the track structure was investigated by establishing a finite-element model. The results showed that the temperature transfer between layers has a temperature-lag effect. The positive and negative temperature gradients between the lower part of the track slab and the cement asphalt (CA) mortar layer of the constrained specimen are smaller than those of the free specimen. The longitudinal displacement of the track slab for the free specimen is significantly affected under the hygro-thermal environment and the longitudinal displacement of the concrete base and the track slab forms a displacement difference. Numerical-analysis results showed that the bottom of the concrete base is prone to produce a high-temperature core and that the temperature inside the track structure forms an agglomeration effect. KEYWORDS: Slab track, Hygro-thermal environment, Structural performance, Scale model, Finiteelement model.

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Section: Structural Stress Of Ballastless Trackmentioning

confidence: 99%

Experimental and Numerical Investigations of Structural Performance of Slab Track under Hygrothermal Environment

Song¹,

Yao²,

Yu³

et al. 2023

JJCE

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“…Further, the influence of temperature variations may have an effect on certain track responses, e.g. interfacial stresses [28,29]. In addition, differential settlement and ground vibrations are important in the evaluation procedure.…”

Section: Demandsmentioning

confidence: 99%

“…interfacial stresses. 28,29 In addition, differential settlement and ground vibrations are important in the evaluation procedure. For slab tracks, differential settlement has been studied by Guo and Zhai, 9 whereas work related to ground vibrations is presented for example in Ref.…”

Section: Demandsmentioning

confidence: 99%

Innovative requirements and evaluation methods for slab track design

Aggestam,

Ekberg,

Nielsen

2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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With increasing train speeds and reduced time windows for maintenance work, the interest in the application of slab track technology to increase the capacity of high-speed railways has grown. Slab track may still be considered a relatively young technology, but with several different designs available on the market. Current research on slab tracks commonly focuses on improved methods. In contrast, the formulation of requirements, and evaluation towards these, are seldom investigated. In this paper, state-of-the-art simulation models are employed to illustrate and address the needs for innovative requirements in terms of structural integrity and robustness, life cycle cost (LCC) and environmental footprint of new and existing slab track designs. Based on demonstration examples, it is argued that current standards may lead to overly conservative designs inducing higher LCC and environmental footprint than necessary. Extensions of the standards in terms of LCC and environmental footprint are suggested. The conflict of interest between structural integrity and robustness, LCC and environmental footprint is discussed, and suggestions for how to optimise slab track structures are proposed.

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“…Su et al [20] accurately simulated the interfacial debonding process of a longitudinal continuous slab track by combining on-site experiments, finite element analysis, and machine learning methods. Zhou et al [21] studied the effect of different temperatures and constraint conditions on the interfacial bonding properties of track slab-CA mortar. Shi et al [22] proposed a method for accurately evaluating the time-varying reliability of interlayer damage in slab tracks.…”

Section: Introductionmentioning

confidence: 99%

Evolution Mechanism of Interlayer Properties of CRTS III Slab Track during Construction

Wang,

Gao,

Wang

et al. 2024

Applied Sciences

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The interlayer properties of the CRTS III slab track during construction directly affect its long-term service condition. This article introduces time-varying coefficients that characterize the early properties of the interface between track slab and SCC to improve the bilinear CZM. Based on this, an interlayer property evolution model of the CRTS III slab track during construction is established. The evolution mechanism of interlayer properties under complex loads and the influence mechanism of key parameters on them are revealed. The results show that after SCC pouring, the interlayer damage at the corner of the slab becomes a sensitive area due to the combined effects of SCC shrinkage and temperature gradients. Interlayer damage initially manifests at the corner of the slab before progressively spreading toward the center of the slab, influencing the composite performance and force transmission characteristics of the track structure. The interlayer bonding property, shrinkage performance of SCC, and construction temperature substantially affect interlayer damage evolution. To reduce the risk of damage, mineral admixtures and expansion agents can be added as additives to improve the bonding property and minimize shrinkage of SCC. Insulation measures should be taken for SCC during low-temperature construction, and SCC pouring construction below 0 °C and above 30 °C should be avoided.

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Thermal evolution of CRTS Ⅱ slab track under various environmental temperatures: Experimental study

Cited by 37 publications

References 24 publications

Experimental and Numerical Investigations of Structural Performance of Slab Track under Hygrothermal Environment

Experimental and Numerical Investigations of Structural Performance of Slab Track under Hygrothermal Environment

Innovative requirements and evaluation methods for slab track design

Evolution Mechanism of Interlayer Properties of CRTS III Slab Track during Construction

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