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High performance bituminous sub-ballast for improving

2021-5-4  Materials. Two different binders were studied for the creation of the high-performance bituminous sub-ballast layer: a conventional B50/70 bitumen (CB) was used as a reference, having been commonly used in previous asphalt railway tests [9, 20]; and a modified, low-penetration bitumen containing rubber from out-of-use tires (MB).The latter bitumen is a commercial product, specially designed to ...

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Research on Railroad Ballast Specification and Evaluation

rock, slag, and gravel railway ballast sources are summarized in this paper. Comments are included about the new Canadian Pacific Rail ballast specif i­ cation, which was partially based on the findings presented by Raymond et al. Cl> The selection of the top ballast (hereafter re­

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Discrete element modelling of railway ballast performance ...

2020-8-27  Railways play a significant role in the transportation system worldwide and work in many sectors (urban rail, high-speed railway, heavy haul, intercity and metro) [1, 2].Ballasted tracks, as the most widely used track type, consist of rails, sleepers and the ballast

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EFFECT OF RAILWAY TRACK ELEMENTS PROPERTIES ON

2015-4-27  The railway track elements (iron rail bars, concrete sleepers, crushed stone layers, base or ballast layer and the subgrade layer) play an important role to resist the stresses resulting from the movement of trains on this track line, the basic purpose for the railway components to

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Performance of Ballast Influenced by Deformation and ...

This paper presents a study on the deformation and degradation responses of railway ballast using large-scale laboratory testing and computational modeling approaches. A series of large-scale triaxial tests were carried out to investigate the ballast breakage responses under cyclic train loading subjected to varying frequencies, f

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(PDF) Mechanical Properties of Polyurethane-Stabilized

PSB has mechanical properties similar to cement-stabilized soil (i.e., displays flexural strength), but has much greater compressive strength than ballast, which is critical for stabilization of ...

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Evaluation of condition of gravel ballast layer on high ...

2014-12-1  A high-speed railway track consists of rails, concrete sleepers, gravel ballast, a reinforcing subgrade, and a subgrade, as shown in Fig. 1.The dynamic load generated by a train is transferred and dispersed from the rail to the subgrade through the gravel ballast layer, which supports the sleepers against vertical and lateral forces.

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HOT MIX ASPHALT IN BALLASTED RAILWAY TRACK:

2018-2-27  rail, larger and heavier concrete sleepers, high quality ballast material with higher impact strength and introduction of a different granular subballast layers resulted in a level of structural functioning suitable for HSR traffic. Table 2: Track superstructure and their properties Structural component Conventional railway High speed railway

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Bitumen stabilized ballast: A potential solution for ...

2016-10-15  1. Introduction1.1. Background of the problem and state of the art. Ballast is a granular structural layer of the railway substructure and it’s composed of uniformly graded particles between 22 and 63 mm.The ballast layer’s main functions are to provide a solid and uniform foundation for the sleepers, transmit and reduce the stress from passing trains to acceptable level for the subgrade ...

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Micro-mechanical investigation of railway ballast behavior ...

2019-10-24  Abstract Ballasted tracks are the commonly used railway track systems with constant demands for reducing maintenance cost and improved performance. Elastic layers are increasingly used for improving ballasted tracks. In order to better understand the effects of elastic layers, physical understanding at the ballast

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Ballast Thickness Design for Changing Environment(s)

2 天前  Ballast Thickness Required for Subgrade Properties • Based on Track Life / Number of Load Cycles (N) • Design Wheel Load (Pd ) Considering • ρ. a = allowable subgrade deformation • Subgrade soil type • Subgrade and Ballast Moduli • Subgrade strength • T: Subgrade thickness • L: 6 in. Constant 11. Source: Li et al, 2015

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FAST Ballast and Subgrade Materials Evaluation - Ballast ...

2021-8-20  Subgrade, Ballast Performance, Conventional Railway Track Support System, Materials Testing, Material Properties 1977_FAST BALLAST AND SUBGRADE MATERIALS EVALUATION BAL.PDF DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability.

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BALLAST MAT INFRASTRUCTURE - Scene7

2018-12-13  life of the ballast. Ballast Mat reduced the Vertical Track Modulus (VTM) by 55 percent in concrete tie track. The impacts at mid-span were reduced by 30 to 40 percent on bridges. Progress Rail’s high-performance Ballast Mats are produced from recycled rubber, resulting in a lower natural frequency compared to traditional ballast mats. This ...

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Deformation and Degradation Mechanisms of Railway

It needs to note that the reduction of the vibration and the ballast layer thickness are crucial for the high speed railway, because they induce problems in the ballast degradation, ballast layer ...

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Railway Technical Website

2018-5-28  freight line. Ballast is made up of stones of granite or a similar material and should be rough in shape to improve the locking of stones. In this way they will better resist movement. Ballast stones with smooth edges do not work so well. Ballast will be laid to a depth of 9 to 12 inches (up to 300 mm on a high speed track). Ballast weighs about

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Shear Behavior of Railway Ballast Based on Large-Scale ...

Unsatisfactory performance of railway tracks is often associated with the loss of cross level, track profile and track alignment. The in situ condition and the engineering behavior of ballast are also important aspects governing the stability and performance of a given railway track structure.

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(PDF) Application of laser based technology to quantify ...

The fundamental measurements of railway ballast shape characteristics are essential for good quality control and, ultimately, for understanding their influence on performance of the track structure.

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The Influence of Ballast Fouling on Track Settlement

2019-2-21  The contamination of railway ballast (referred to as ballast fouling) is commonly caused by ballast particle degradation, external debris fouling due to surface spillage and clay fouling due to subgrade pumping. Intrusion of these fines in the ballast layer can impede rapid drainage which is necessary for good track performance.

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Introduction to Railroad Track Structural Design

2009-7-2  • Ballast quality and ability to resist crushing forces (ballast degradation is the number 1 cause of ballast fouling) – Some railroads use different track modulus (u) values in design. For example, Spring u may be used for rail bending and ballast depth, but Winter u used for rail seat forces. Other railroads may use a single u value.

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Investigation of track settlement and ballast degradation ...

2018-12-11  The test results show that the settlement of the high-speed railway ballasted track is very less. A logarithmic model was proposed for predicting the settlement of the high-speed railway ballasted track by fitting the measured data. Moreover, some painted ballast samples were embedded into the tested track to investigate the ballast degradation.

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FAST Ballast and Subgrade Materials Evaluation - Ballast ...

2021-8-20  Subgrade, Ballast Performance, Conventional Railway Track Support System, Materials Testing, Material Properties 1977_FAST BALLAST AND SUBGRADE MATERIALS EVALUATION BAL.PDF DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability.

Get Price

Railway Technical Website

2018-12-28  freight line. Ballast is made up of stones of granite or a similar material and should be rough in shape to improve the locking of stones. In this way they will better resist movement. Ballast stones with smooth edges do not work so well. Ballast will be laid to a depth of 9 to 12 inches (up to 300 mm on a high speed track). Ballast weighs about

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Settlement response of fibre reinforced railway ballast ...

2016-6-1  Ballasted track is the prevalent track form worldwide and with good design and maintenance can satisfy high performance demands including those of high speed lines. However, increasingly onerous loading is being placed on existing ballasted track networks in many parts of the world by more frequent, longer, faster and heavier trains. This leads to reduced windows of time for maintenance ...

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The Influence of Ballast Fouling on Track Settlement

2019-2-21  The contamination of railway ballast (referred to as ballast fouling) is commonly caused by ballast particle degradation, external debris fouling due to surface spillage and clay fouling due to subgrade pumping. Intrusion of these fines in the ballast layer can impede rapid drainage which is necessary for good track performance.

Get Price

Introduction to Railroad Track Structural Design

2009-7-2  • Ballast quality and ability to resist crushing forces (ballast degradation is the number 1 cause of ballast fouling) – Some railroads use different track modulus (u) values in design. For example, Spring u may be used for rail bending and ballast depth, but Winter u used for rail seat forces. Other railroads may use a single u value.

Get Price

Investigation of track settlement and ballast degradation ...

2018-12-11  The test results show that the settlement of the high-speed railway ballasted track is very less. A logarithmic model was proposed for predicting the settlement of the high-speed railway ballasted track by fitting the measured data. Moreover, some painted ballast samples were embedded into the tested track to investigate the ballast degradation.

Get Price

Discrete Element Modeling of Railway Ballast for Studying ...

2020-7-23  Discrete Element Modeling of Railway Ballast for Studying Railroad Tamping Operation Nilesh Dama, Nilesh Dama ... ballast mechanical properties, contact model, and parameters governing the contact force models are described in detail. ... The tamping process is evaluated using a half-track layout with a highly modular code that enables a high ...

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Laboratory Evaluation of Naturally Abraded Ballast ...

2018-6-14  Laboratory tests are commonly used to investigate the performance and behavior of ballast in various conditions. In large part, these investigations use freshly quarried rock prepared to meet gradation requirements of AREMA or similar organizations as the ballast material.

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Track - Network Rail

Our High Output Track Renewal System (TRS) and Ballast Cleaning System (BCS) allow us to replace track and clean ballast quickly overnight while trains continue to run safely on adjacent lines. Working overnight is essential because the railway can’t sustain the

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ENGINEERING SPECIFICATIONS FOR INDUSTRIAL

2012-10-19  construct a rail siding to an existing facility, to a green field site, including rail access to industrial parks, and to rail-truck transload facilities. The document is an especially useful guide to the Consulting Engineers and to the ConPulverizers retained by groups/firms requiring rail access.

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