Influence of mixture composition on fresh concrete workability for ballastless track slabs

Kazanskaya, Liliya; Smirnova, Olga

doi:10.1051/e3sconf/202015706022

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Non-ballasted track systems require signifi cant capital investment but they have a number of advantages over ballasted track structures. These advantages lie in the reduction of maintenance costs, improved train ride quality and passenger ride comfort as well as reduced fuel and energy consumption required for train traction and others [2].…”

Section: Introductionmentioning

confidence: 99%

Modulus of elasticity of non-ballasted track

Ivanova

Kolos

Wang

2023

jour

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The main stiffness properties that determine the stresses in the track structure components under loads from a moving train are the modulus of elasticity of the rail slab and the slab-track/rail correlation stiffness coefficient. These parameters have been investigated for a ballasted track and are well established today, in contrast to those of a non-ballasted track. This study aims at determining the stiffness characteristics of a non-ballasted track, comparing them with those of a ballasted track, and assessing their effect on the stress-strain state (SSS) of the elements of a non-ballasted track structure. Field experiments to measure the stresses in the track structure elements were carried out using strain-gauge methods. As a result of the experiments, the modulus of elasticity and the correlation stiffness coefficient of the rail slab and the rail were determined for the RHEDA2000 slab track system. The results obtained prove it possible to apply a rail-as-beamon-elastic-foundation theory and to use well-established calculation methods for designing a non-ballasted track structure suitable for different operational conditions.

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Section: Introductionmentioning

confidence: 99%

Modulus of elasticity of non-ballasted track

Ivanova

Kolos

Wang

2023

jour

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“…Track concrete, as the main load-bearing structural material, is also widely used in track traffic [1][2][3][4][5][6]. By virtue of its supporting, waterproof, anti-corrosion and other functions, it is widely used in structures such as shield segments, secondary lining of tunnels and main body of stations [7][8][9][10][11]. Concrete used in track traffic construction is often divided into two types, one is structural durability C40 concrete for ballast pouring, and the other is C30 ordinary concrete for transition section laying [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermal-Mechanical Coupling Analysis of Track Concrete and Study on Thermal Damage at Initial Stage of Construction

Xia¹

2022

IJHT

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To avoid defects in concrete structure caused by the particularity of structure, the complexity of construction process and the contingency of human operation in the track construction process, it is necessary to conduct comparative tests on the workability, strength, adiabatic and semi-adiabatic properties, free shrinkage, durability index and crack resistance of concrete before pouring. At present, in the field of track traffic, the study on establishing the thermal damage model of mass track concrete considering the thermal load is relatively lacking. The existing models do not take into account the thermal damage caused by cement hydration at the initial stage of construction of track concrete structures, and the study on thermal-mechanical coupling analysis at the initial stage of construction is also relatively rare. To this end, this article studies the thermal-mechanical coupling analysis and study on thermal damage of track concrete. It makes the thermal analysis of track concrete at the initial stage of construction by using the direct thermal-mechanical coupling analysis technology. That's, based on the updated Lagrange method, the track concrete thermal coupling equation at the initial stage of construction is constructed. Based on the damage model and direct thermal coupling analysis of track concrete, it builds a thermal damage model suitable for track concrete at the initial stage of construction. The results of thermal coupling analysis of track concrete and thermal damage mechanism analysis at the initial stage of construction are given to verify the effectiveness of the proposed analysis method.

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