Stockpile of Well-Graded Granular Railway Subgrade Blanket Material

RDSO Spec Granular Formation Blanket Layer Material

Product Code: P029

RS CONSTRUCTIONS supplies top-grade Railway Blanket Material manufactured in accordance with RDSO (Research Designs and Standards Organisation) guidelines. Laid directly between the ballast cushion and subgrade earthwork, this well-graded granular filter prevents soft subgrade soil from churning upward (mud pumping) and distributes train wheel loads evenly over the embankment.

Technical Specifications & Properties

  • Nominal Size: 65mm to 20mm graded coarse aggregate (RDSO compliant)
  • Rock Source: High-density Natural Basalt / Trap Rock
  • Impact Value (AIV): Below 20% (High resistance to shattering under dynamic loads)
  • Abrasion Value (Los Angeles): Below 30%
  • Flakiness & Elongation Index: Combined < 20% (Ensures strong mechanical interlock)
  • Supply Unit: Per Brass (100 cu.ft) or Tipper Truck/Rake loads
  • Tax Rate: 5% GST (Applicable)

Recommended Applications

1. Railway Track Subgrade Formation

Acts as an indispensable sub-ballast protective layer over cohesive or weak clay subgrade soils to stop mud pumping and prevent ballast sinkage.

2. Freight Corridors & Private Sidings Construction

Protects embankment soils against dynamic stress degradation under heavy axle loads ($22.5\text{T}$ to $25\text{T}$ axle configurations).

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Frequently Asked Questions

What is the main function of a blanket layer in railway track construction?

The blanket layer serves as a filter and load distributor between the track ballast and soft embankment soil. It prevents fine clay particles from rising into the ballast cushion under repeated dynamic traffic loads.

How thick is the blanket layer required to be on railway formations?

Depending on the underlying soil subgrade classification and axle load capacity, the blanket layer thickness usually ranges between 300mm to 900mm as per RDSO design norms.

What GST rate applies to granular railway blanket material?

Crushed granular blanket material carries a standard GST rate of 5% in India.