Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

Szalai, Szabolcs; Eller, Balázs; Juhász, Erika; Movahedi, Majid Rad; Harrach, Dániel; Baranyai, Gusztáv; Fischer, Szabolcs

doi:10.31181/rme20016032022s

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…Instead, an analysis method has been found and presented in this paper, which makes possible the preparation and testing of a smaller amount of bitumen specimens in the laboratory, characterising base binders, binders extracted from the RA or their blends. There are emerging technologies available in civil engineering, such as digital image correlation method (DICM) to predict behaviours in structures [25]; similarly, the dynamic shear rheometer (DSR) device and the data derived from the DSR test is considered emerging technology and it was found suitable for this purpose.…”

Section: Discussionmentioning

confidence: 99%

Rheological characterisation of bituminous binder blends for the design of asphalt mixes containing high recycled asphalt content

Tóth

Pethő²,

Rosta³

2023

Acta Tech. Jaurinensis

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Reclaimed asphalt pavement (RAP) is gained from road reconstructions; however, its usage is less optimised in Hungary and neighbouring regions, since on the project level the proportion of RAP in the asphalt mixes is only 10-15%. This is less than the recommended level in other EU countries. The higher usage of RAP provides economic and environmental advantages, decreasing the need for new materials, the transport cost, and the carbon footprint. The composition of the resultant bituminous binder blend is a critical element in the asphalt mix design with high RA content. This paper discusses the design of the resultant bituminous binder blend to provide performance and compliance characterisation. This paper also presents the complex rheological analysis of the base bitumen, the bitumen extracted from the RA and the bituminous binder blend, applying the dynamic shear rheometer (DSR) device. It was shown that for paving grade bitumen (B), polymer modified bitumen (PmB) and rubber modified bitumen (GmB), the addition of higher proportions of RA content is possible without compromising on the performance of the binder blend. With a carefully chosen paving grade bitumen it is possible to utilise up to 40% RA content. For the polymer modified bitumen, the limit of the RA content is 20%. For the rubber modified bitumen, the various proportions of RA contents showed no or negligible changes in the characteristics of the bitumen and the RA content can reach 30% in this case.

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Section: Discussionmentioning

confidence: 99%

Rheological characterisation of bituminous binder blends for the design of asphalt mixes containing high recycled asphalt content

Tóth

Pethő²,

Rosta³

2023

Acta Tech. Jaurinensis

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“…In [28], the influence of the thermal cycle of welding on the structure and properties of the metal of the thermal impact zone for steel C460M was studied. The results of the experimental data relate to the values of static strength, ductility and toughness at the level of the parent metal, as well as structural changes in the weld.…”

Section: Iianalysis Of Literature Data and Problem Statementmentioning

confidence: 99%

Investigating the temperature field distribution over transport structures' metal corrugated construction surface under temperature influences

Kovalchuk¹,

Kravets

Nabochenko³

et al. 2022

Acta Tech. Jaurinensis

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The experimental studies results of temperature distribution over metal corrugated sheet structure surface at positive and negative ambient temperatures are presented. It is established that the temperature is distributed unevenly over the sheet surface along its plane. An analytical method for calculating the temperature field from a fragment of a structure metal sheet in the case of setting the temperature at the sheet area boundaries is presented. The calculation of the temperature field distribution on the metal sheet of the structure with the setting of the temperature along the contour of the sheet is performed. As a result, it is established that at the metal sheet boundaries there is a temperature difference, which can cause the occurrence of temperature stresses and deformations.

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“…The study involved a section of railway track in free space and was subjected to loading by a dynamic pulsator [25,26].…”

Section: Introductionmentioning

confidence: 99%

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

Huschek-Juhász,

Németh,

Sysyn

et al. 2024

Nauk. visn. nat. hirn. univ.

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The physical classification of crushed stone and gravel used in railway construction is based on their strength and endurance and is performed by a laboratory test method using a rotating drum or a mortar method. The values of fracture resistance calculated using the Los Angeles method and abrasion calculated using the Micro-Deval method show a corresponding correlation and require further investigation. Purpose. The development of a new method for measuring rock material fracture that is consistent with widely used standards while also being more comparable to real-world railway operating conditions. Certainly, both standard tests are essential for ensuring product homogeneity during production, so the new recommended method is only a supplement. Methodology. The Proctor device was used to induce so-called shock loads from above, similar to railway loading conditions. Unlike the standard method, the andesite material was placed in a standard cylinder in these tests. The samples were pre-screened and sorted; the specified weight was approximately 1,300 g, and the specified sizes of the individual particles were 6.3, 8.0 and 11.2 mm. Only prewashed and dried materials of NZ (fine crushed stone) or KZ (special crushed stone) from four different quarries (Tállya, Szob, Nógrádkövesd, Recsk) with different rock physics characteristics were considered. The Proctor compactor machine was used because of its calculable labor (19.86 J/impact) and the crushing effect of the calculable impacts (64, 128, 256 and 1,028 blows). Even after loading different numbers of impacts, homogeneous samples from different quarries were sieved to measure the masses of fragments per fraction. Findings. The set of measurements made it possible to establish a series of fragmentation and degradation curves for each of the three repeated measurements based on the composition of the material and the number of blows, which showed the degradation of samples with different physical and mechanical properties of the rock material and particle sizes. With an increasing number of impacts, the amount of crushed material in the sample increased, but the distribution of crushed material did not decrease evenly and proportionally as the number of impacts increased. Parameters and indices were also computed to identify various correlations (i. e., FV, d < 22.4, d < 0.5, d < 0.063 mm, CU, M ratio,  ratio). Some of them (e. g., FV) needed to be changed, but they were predefined due to the nature of the tests. Originality. While many standard and alternative railway track ballast fragmentation test methods and measurement tools are available, this paper proposes a new laboratory method and demonstrates the specific measurement and application effectiveness. Practical value. In addition to standard tests that are already widely used, the new method for measuring the fractional composition of railway ballast can help simulate real-world operating conditions of a railroad track in the laboratory. This method will improve the safety of railway operations.

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Investigation of deformations of ballasted railway track during collapse using the Digital Image Correlation Method (DICM)

Cited by 18 publications

References 19 publications

Rheological characterisation of bituminous binder blends for the design of asphalt mixes containing high recycled asphalt content

Rheological characterisation of bituminous binder blends for the design of asphalt mixes containing high recycled asphalt content

Investigating the temperature field distribution over transport structures' metal corrugated construction surface under temperature influences

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

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