-Within the paveme
-Within the pavement structure
In this case, the most effective location for the geotextile is within the base course or between the base course and the wearing course at a depth of no less than 40mm. As the tensile strength of an unreinforced pavement is low in comparison to its compressive strength , the presence of the geotextile within the pavement structure is intended to improve the tensile strength and give it a greater resistance to cracking and also a large fatigue life.
It is worth to mension that, geotextiles placed within the pavement structure will be in contact with hot asphalt and will therefore need high thermal stability.
The construction technique
A 50 mm layer of asphalt mix is placed and compacted . Closely followed by unrolling the geotextile over this surface , then heaps of asphalt mix are used to hold the geotextile in place during unrolling . A second 50mm asphalt is spread by
Fig (I-13) Use of geotextiles in permanent road construction
hand and then these layers are rolled. The remaining asphalt mix layers are then placed in the conventional manner (9) .