Sub-base & Base-Course Material

A road cross-section consists, from the bottom up, of natural ground, fill, sub-base, base course and finally the asphalt wearing course. Sub-base and base course are the load-bearing layers that distribute traffic loads down to the subgrade.

Sub-base is typically coarser-grained and serves a more economical fill role, providing drainage and a stable platform for the layers above.

Base course has a tighter gradation and higher strength requirements. Sitting directly under the asphalt, it carries the bulk of the mechanical stress imposed by traffic.

Modern road projects also rely on: drainage aggregate, asphalt mix aggregate (binder and wearing course), concrete aggregate (for structures), shoulder material and side-fill.

ZAD Group produces and supplies all of these categories. A single-supplier setup secures your project schedule, price stability and material consistency.

Strategic road projects across South-East Anatolia — including the Diyarbakır–Ergani, Mardin–Kızıltepe and Şanlıurfa–Viranşehir corridors — depend on continuous, high-volume road material.

Our Derik plant is geographically close to these projects, providing both cost and time advantages. Fleet shipping is organised in step with the on-site programme.

All batches are produced to meet gradation, plasticity and abrasion requirements of the Turkish Highways' technical specification (KTŞ Part 401 / 402).

Lab test results are available per batch. For large projects, shipping and quality are coordinated end-to-end from plant to site.