Stockpile of Well-Graded Granular Sub-Base GSB Aggregate for Highway Foundation Work

Granular Sub-Base (GSB) Material Supplier in Mumbai

Product Code: P030

RS CONSTRUCTIONS supplies premium Granular Sub-Base (GSB) Material blended in strict compliance with MoRTH (Ministry of Road Transport and Highways) Section 400 grading standards. Consisting of controlled proportions of crushed stone, coarse aggregate, and mineral fines, GSB creates a dense, non-yielding sub-base layer that distributes heavy wheel loads and acts as an effective drainage barrier.

Technical Specifications & Properties

  • Gradation Standard: MoRTH Section 400 (Grading I / Grading II / Grading III)
  • California Bearing Ratio (CBR): Minimum 30% at 98% MDD compaction
  • Liquid Limit (LL): < 25%
  • Plasticity Index (PI): < 6% (Low clay content to avoid instability)
  • Aggregate Impact Value (AIV): Maximum 40%
  • Supply Unit: Per Brass (100 cu.ft), Cubic Meter, or Tipper Truck loads
  • Tax Rate: 5% GST (Applicable)

Recommended Applications

1. Highway & Flexible Pavement Foundation Courses

Laid directly over compacted subgrade earthwork to serve as the main structural support foundation under Wet Mix Macadam (WMM) and asphalt layers.

2. Drainage & Sub-Base Layers for Heavy Industrial Plots

Functions as a free-draining stabilizing base layer for industrial flooring, parking yards, and warehouse platform foundations.

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Frequently Asked Questions

What is the primary function of GSB in road construction?

GSB acts as a structural foundation layer that spreads heavy traffic axle loads evenly over the subgrade soil while also serving as a drainage layer to drain away infiltrating surface water.

What is the difference between GSB and WMM?

GSB (Granular Sub-Base) is laid directly above the subgrade soil as a sub-base layer with broader grading and lower CBR requirement, while WMM (Wet Mix Macadam) is laid above GSB as a base course with higher crushed fraction and mechanical strength prior to asphalt surfacing.

What GST rate applies to GSB material?

Granular Sub-Base (GSB) crushed aggregate material carries a standard GST rate of 5% in India.