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track ballast quality

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Ball Mill

Ball mill is the vital equipment for recrushing after being crushed.

Processing ability:0.5-500t/h

Feeding size:≤25mm

Applied material:cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc.

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ballast - superstructure :: trackopedia

The tamping (consolidation or stabilisation) of the ballast bed is done with machines, while at the same time the ballast in front of the sleeper ends is consolidated. Optimal resistance to lateral displacement is achieved when dynamic stabilisation of the track has taken place after the tamping and sleeper end consolidation. As loose ballast can best be consolidated by horizontal vibrations, this property is used with the dynamic track stabilizer (DGS dynamischer Gleisstabilisator)

For the ballast bed to function well and be durable it is important that it is free from organic substances and is able to withstand the surface water (rain). An important part of the durability is, among other things, that the ballast should be cleaned. The contamination of the ballast bed has the following effects. The friction between the ballast stones is lowered, the pressure distribution angle is reduced, the pressure on the subgrade rises. Fouling reduces the elasticity of the ballast bed and consequently the continuing durability of the track geometry.

The track is dependent on the quality of the individual substances which were used and thus also of the quality of the ballast material. The most suitable material for the bedding is ballast. Track ballast is broken and screened natural stone. The stones for the track ballast should have the following properties:

ballast - superstructure :: trackopedia

The most suitable ballast comes from hard rocks such as basalt, diabase or granite. Soft rocks such as limestone, dolomite, sedimentary rock, etc. are less useful. The ballast must be suitable for the intended purpose:

The inspection with the measuring trolley method can be a visual inspection. In positions with deep descents the ballast is removed from the sleeper in order to analyse the contamination below the sleepers

track evaluation and ballast performance …

A variety of laboratory tests has traditionally been used in the selection of a material and gradation for ballast. The results of the laboratory tests are commonly used to reject or accept material for use as ballast and rarely imply benefits or costs of selecting alternative materials or gradations. In this paper are presented the results of a track sampling and evaluation program to determine the performance of ballast, subballast, and the subgrade on Canadian Pacific (CP) Rail. A simple method was developed to determine if a significant portion of maintenance of the track structure is attributable to the subballast and subgrade. The concept of ballast life is presented with a relationship between ballast quality and grading. CP Rail specifications for the selection of a ballast material and the processing of ballast are also presented

introduction to railroad track structural design

A variety of laboratory tests has traditionally been used in the selection of a material and gradation for ballast. The results of the laboratory tests are commonly used to reject or accept material for use as ballast and rarely imply benefits or costs of selecting alternative materials or gradations. In this paper are presented the results of a track sampling and evaluation program to determine the performance of ballast, subballast, and the subgrade on Canadian Pacific (CP) Rail. A simple method was developed to determine if a significant portion of maintenance of the track structure is attributable to the subballast and subgrade. The concept of ballast life is presented with a relationship between ballast quality and grading. CP Rail specifications for the selection of a ballast material and the processing of ballast are also presented

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