<i>In situ</i>impact testing of a light-rail ballasted track with tyre-derived aggregate subballast layer

Esmaeili, Morteza; Rezaei, Nazanin

doi:10.1080/10298436.2015.1007226

Cited by 19 publications

(9 citation statements)

References 5 publications

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“…This difference between segregated and nonsegregated frequency histogram standard deviation can be caused by the closer texture of nonsegregated pavements in comparison with the segregated pavement. In other words, as shown in Figure 4, when segregation occurs, on one hand, coarse aggregates may separate from fine aggregates [25]; therefore, aggregates in segregated locations may not have enough interlock to each other which can lead to an increase of voids between the aggregates in pavement texture [26]. This rise in voids in the pavement surface can cause brighter or darker colors, which can, in turn, result in higher standard deviation of segregated areas.…”

Section: Resultsmentioning

confidence: 99%

Asphalt Mixture Segregation Detection: Digital Image Processing Approach

Baqersad

Hamedi

Mohammadafzali

et al. 2017

Advances in Materials Science and Engineering

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Segregation determination in the asphalt pavement is an issue causing many disputes between agencies and contractors. The visual inspection method has commonly been used to determine pavement texture and in-place core density test used for verification. Furthermore, laser-based devices, such as the Florida Texture Meter (FTM) and the Circular Track Meter (CTM), have recently been developed to evaluate the asphalt mixture texture. In this study, an innovative digital image processing approach is used to determine pavement segregation. In this procedure, the standard deviation of the grayscale image frequency histogram is used to determine segregated regions. Linear Discriminate Analysis (LDA) is then implemented on the obtained standard deviations from image processing to classify pavements into the segregated and nonsegregated areas. The visual inspection method is utilized to verify this method. The results have demonstrated that this new method is a robust tool to determine segregated areas in newly paved FC9.5 pavement types.

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Section: Resultsmentioning

confidence: 99%

Asphalt Mixture Segregation Detection: Digital Image Processing Approach

Baqersad

Hamedi

Mohammadafzali

et al. 2017

Advances in Materials Science and Engineering

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“…Naudojant geležinkelio kelio pobalastiniame sluoksnyje susmulkintų padangų užpildą (angl. TDA -tyre-derived aggregate), jis sumažina 6-47 dB triukšmą, kylantį dėl vertikalių virpesių, sukeltų traukiniui judant, ir prailgina kelio gyvavimo ciklą (Esmaeili, Rezaei 2016).…”

Section: įVadasunclassified

Research of Railway Aggregate Sub-Ballast Mixture Properties / Geležinkelio Pobalastinio Sluoksnio Iš Užpildų Mišinio Savybių Tyrimas

Navikas

Sivilevičius

2016

Mokslas – Lietuvos Ateitis

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Railway sub-ballast layer is a connecting layer between the ballast and other track layers. This layer must ensure even load distribution into the subgrade, drainage surface water, prevent materials of layers mixing. Ensuring these properties allows to extend the explotation of all railway road construction and geometrical parameter of road maintenance. This article analyzes investigated railway sub-ballast mixture properties from large sample sizes (n = 49): gradation, water permeability and density statistical parameters. The regression equation showing the relationship between the fully percent passing through sieves averages and standard deviations is presented. Her coefficient of determination (R2 = 0.909). The minimum number of representative samples of these three properties research is determined. Irregularity in most cases of water permeability (ν = 88,3%), depending on the laboratory tests methodology errors, is indicated. Geležinkelio pobalastinis sluoksnis yra jungiamasis sluoksnis tarp balasto ir grunto sluoksnių. Šis sluoksnis turi užtikrinti tolygų apkrovos perdavimą į sankasą, nudrenuoti paviršinį vandenį, neleisti maišytis sluoksnių medžiagoms. Šių savybių užtikrinimas leidžia prailginti visos kelio konstrukcijos eksploataciją ir geometrinių kelio parametrų išlaikymą. Šiame straipsnyje yra analizuojamos užpildų mišinio, naudojamo geležinkelio pobalastiniame sluoksnyje, iš didelės imties (n = 49) gautos savybės: granuliometrinės sudėties, pralaidumo vandeniui ir tankio statistiniai parametrai. Pateikta granuliometrinės sudėties regresijos lygtis, rodanti sąsają tarp pilnutinių išbirų per sietus vidurkių ir standartinių nuokrypių. Jos determinacijos koeficientas R2 = 0.909. Apskaičiuoti reprezentatyvūs minimalūs bandinių skaičiai šioms trims savybėms tirti. Gauta, kad pralaidumo vandeniui savybė yra labiausiai nevienoda dėl laboratorinių tyrimų metodikos paklaidų, variacijos koeficientas (88,3 %).

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“…12 In railway engineering standpoint, the use of tire-derived aggregate (TDA) has been put under consideration for the purpose of reducing environmental vibration by various researchers. [13][14][15][16] In some cases, the TDA was used by mixing it with ballast or sub ballast. Esmaeili et al 17 investigated the dynamic behavior of ballasted track containing ballast mixed with TDA.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, reusing scrap tires in industries have increased as consequence of accumulating more waste tires around the world . In railway engineering standpoint, the use of tire‐derived aggregate (TDA) has been put under consideration for the purpose of reducing environmental vibration by various researchers . In some cases, the TDA was used by mixing it with ballast or sub ballast.…”

Section: Introductionmentioning

confidence: 99%

Tire‐derived aggregate layer performance in railway bridges as a novel impact absorber: Numerical and field study

Esmaeili

Siahkouhi

2019

Struct Control Health Monit

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Summary The current paper aims to investigate the effects of tire‐derived aggregate (TDA) layer as a novel impact absorber in railway bridges. In the first step, a concrete short slab bridge was selected at Tehran‐Qom old railway line at 168 + 100 km of Tehran. In continue, for measuring field data, the nominated bridge was evaluated under moving train dynamic loads in both presence and absence of TDA layer as a damper material, which was located between the deck slab and ballast layer. In the second step, a 3D finite element model of selected railway bridge was developed, and corresponding results were compared with those obtained from the field and consequently, the numerical model validity was approved. Afterwards, basing on the verified model, a comprehensive parametric study was conducted on train wheel load, train moving speed, and TDA layer thickness to investigate their effects on track–bridge dynamic behavior.

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In situimpact testing of a light-rail ballasted track with tyre-derived aggregate subballast layer

Cited by 19 publications

References 5 publications

Asphalt Mixture Segregation Detection: Digital Image Processing Approach

Asphalt Mixture Segregation Detection: Digital Image Processing Approach

Research of Railway Aggregate Sub-Ballast Mixture Properties / Geležinkelio Pobalastinio Sluoksnio Iš Užpildų Mišinio Savybių Tyrimas

Tire‐derived aggregate layer performance in railway bridges as a novel impact absorber: Numerical and field study

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