New possibilities to reduce track costs on high-speed lines using a bituminous sub-ballast layer

Teixeira, Paulo Fonseca; Pita, Andrés López; Ferreira, Patrícia Afonso

doi:10.1080/10298431003749733

Cited by 42 publications

(19 citation statements)

References 5 publications

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“…Ballasted track design solution of applying bituminous material in the subballast layer instead of a granular one, has been studied Conventional v=350 with Ballast mats v=350 Conventional v=300 with Ballast mats v=300 (already used in some high speed track sections) in terms of the positive impacts it may have on the real performance of the tracks, see for instance [6,7]. An extended research study on this type of solution was made during the research project Bitu-Rail [8] where four track sections were built and instrumented in laboratory and accompanied by simulations made in different numerical models.…”

Section: Impact Of Applying Bituminous Subballast To Reduce Track Vibmentioning

confidence: 99%

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Numerical modelling of high speed train/track system for the reduction of vibration levels and maintenance needs of railway tracks

Ferreira

López-Pita

2015

Construction and Building Materials

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Section: Impact Of Applying Bituminous Subballast To Reduce Track Vibmentioning

confidence: 99%

“…The track design solution of replacing the granular subballast for a bituminous layer has been increasingly believed to be a good solution to achieve track enhanced performance in its whole life cycle. See [6][7][8] for more details on this design solution.…”

Section: Ballasted High-speed Track Design Solutions For An Improved mentioning

confidence: 99%

Numerical modelling of high speed train/track system for the reduction of vibration levels and maintenance needs of railway tracks

Ferreira

López-Pita

2015

Construction and Building Materials

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“…1. Several studies have shown that the use of asphalt subballast might increase service life and minimize total life cycle costs (Teixeira et al, 2010, Rose et al, 2010.…”

Section: Structure and Boundary Conditionmentioning

confidence: 99%

Parametric Study on Geogrid-Reinforced Track Substructure

Oh¹

2013

International Journal of Railway

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The purpose of this paper was to evaluate the effectiveness of geogrid for conventional ballasted track and asphalt concrete underlayment track using PLAXIS finite element program. Geogrid element was modeled at various locations that include subballast/subgrade, subballast/ballast interfaces, middle of the ballast, and one-third depth of the ballast. The results revealed that the effectiveness of geogrid reinforcement appeared to be larger for ballasted track structure compared to asphalt concrete underlayment track. Particularly, in case of installing geogrid at one-third depth of ballast layer in a conventional ballasted track, the most effectiveness of geogrid reinforcement was achieved. The influence of geogrid axial stiffness on track substructure response was not clear to conclude. Further validations using a discrete element method along with experimental investigation are considered as a future study. The effect of asphalt concrete layer modulus was evaluated. The results exhibited that higher layer modulus seems to be effective in controlling displacement and strain of track substructure. However it also yields slightly higher stresses within track substructure. It infers that further validations are required to come up with optimum asphalt concrete mixture design to meet economical and functional criteria.

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“…The asphalt sub-ballast layer positioned between the ballast and the subgrade is the most popular structure form among them, which has been practically used in many countries [10]. An asphalt layer of 12-15 cm is used in both normal-speed and high-speed ballast track in Italy, France, Spain, and the United States [11][12][13][14][15][16][17][18]. While, in Japan, a 5 cm asphalt layer is employed to enhance the carrying capacity of ballast track.…”

Section: Introductionmentioning

confidence: 99%

Application of Mastic Asphalt Waterproofing Layer in High-Speed Railway Track in Cold Regions

et al. 2018

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Abstract:Freeze-thaw damage is a typical distress incurred in road and railway engineering in cold regions. Concrete waterproofing layer is commonly used in high-speed railway tracks to prevent the penetration of surface water, however, it cracks easily under thermal stress, especially in cold regions. Recently solutions have been proposed to increase the waterproofing layer's cracking resistance by using asphalt layers. Nonetheless, the use of emulsified asphalt as well as dense-graded asphalt mixture were not effective enough. To improve the effectiveness, in this study, mastic asphalt was designed for application as the waterproofing layer on the subgrade surface of high-speed railway tracks in cold regions. The overall performance of mastic asphalt was preliminarily evaluated by laboratory tests, then a 200-m test section was constructed for field validation in northeastern China as part of a new high-speed railway line, and water content sensors were placed inside the subgrade to monitor the performance of the mastic asphalt waterproofing layer (MAWL). The subsequent field investigation and monitoring data during the two years operation showed that MAWL dramatically outperformed the conventional concrete waterproofing layer in terms of waterproof performance. Plenty of serious cracks were found in the conventional concrete waterproofing layer, but only a limited number of local cracks were observed in MAWL. As a result, MAWL keeps the water content of subgrade at a stable level. In addition, MAWL showed relatively high stability during the two years investigation period, and no obvious deterioration was observed in the test section.

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New possibilities to reduce track costs on high-speed lines using a bituminous sub-ballast layer

Cited by 42 publications

References 5 publications

Numerical modelling of high speed train/track system for the reduction of vibration levels and maintenance needs of railway tracks

Numerical modelling of high speed train/track system for the reduction of vibration levels and maintenance needs of railway tracks

Parametric Study on Geogrid-Reinforced Track Substructure

Application of Mastic Asphalt Waterproofing Layer in High-Speed Railway Track in Cold Regions

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