Granular pavement layers
GSB & WMM road base construction
Granular Sub-Base (GSB) and Wet Mix Macadam (WMM) distribute loads and provide the stable, well-drained platform required below bituminous or concrete surfacing.
- Approved aggregate grading
- Controlled layer thickness
- Moisture and compaction control
- Camber, cross-fall and level checks
Execution approach
Typical work sequence
The final method, layer thicknesses, materials and inspection points are aligned with the approved drawings, specifications and actual site conditions.
Prepared formation
Confirm the approved subgrade is stable, trimmed and free of soft spots.
GSB placement
Spread the granular sub-base to the planned profile and thickness.
WMM laying
Place the wet-mix layer with controlled moisture and segregation control.
Compaction and checks
Compact, check density and levels, and release the layer for the next activity.
Visual reference
Process and site record
The first image is a client-supplied process illustration. The Karjat images are client-supplied site photographs. Layer design and testing are project-specific.