under carriage , Iran

Road base components include aggregates, stabilized soils, geotextiles, and asphalt concrete for constructing sub-base and base layers of roads. Aggregate particle size typically ranges from 5 to 50 mm with compressive strength of 50–250 MPa. Cement- or lime-stabilized soil has permeability of 10^-5 to 10^-7 m/s and shear strength of 150–300 kPa. Geotextiles made from polypropylene or polyester provide tensile strength of 20–60 kN/m. These components are designed to enhance stability, reduce settlement, and distribute load uniformly.

Structurally, the road base layers consist of 15–30 cm thick aggregate layers, 20–40 cm stabilized soil layers, and geotextile placement between layers. Aggregates are shaped and angled to maximize friction and prevent slippage. Final compaction is performed at 95–100 percent of standard Proctor. This design ensures heavy traffic load capacity, minimizes water infiltration, and provides long-term road durability, optimized for urban and intercity road construction projects.You can order and buy under carriage from Iran by contacting us through whatsaap and email.
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