What material is specified for the interface during asphalt pavement reconstruction after trenching?

The specification for the interface during asphalt pavement reconstruction after trenching emphasizes the use of a geogrid with a minimum tensile strength of 10 kN/m because geogrids are designed to reinforce soil and improve the structural integrity of pavements. They are particularly effective in distributing loads over a larger area, which is crucial when dealing with the rehabilitation of areas that have been compromised by trenching. The tensile strength requirement of 10 kN/m ensures that the geogrid can withstand the stresses and strains that occur during the paving process, thereby maintaining the stability and longevity of the reconstructed pavement.

Other materials listed in the alternatives do not provide the necessary reinforcement or structural support that is critical in this context. The use of gravel or sand lacks the tensile properties required to adequately stabilize the pavement interfaces. Concrete, while strong, would not typically be employed in the same manner for interface applications due to issues of bonding and flexibility in asphalt systems. Therefore, the choice of geogrid is both strategically sound and aligned with best practices in asphalt pavement reconstruction following trenching.