What is a recommended way to improve asphalt durability?

Increasing the asphalt binder content is a recommended way to enhance asphalt durability because the binder plays a crucial role in binding the aggregate particles together and providing the necessary flexibility and resilience to the asphalt mix. A higher binder content can improve the overall cohesion of the asphalt mixture, which helps resist cracking and other forms of distress during its lifespan. This additional binder effectively contributes to weather resistance, reduces the risk of stripping caused by moisture, and enhances the material’s resistance to fatigue and deformation under load.

In contrast, reducing the amount of aggregate could compromise the structural integrity and stability of the asphalt mix, potentially leading to an inadequately strong pavement. Lowering the mixing temperature might help with some environmental considerations but can negatively affect the binder's performance, especially if it leads to inadequate coating of the aggregate. Using recycled materials exclusively, although beneficial for sustainability, does not guarantee improved durability unless the recycled materials are specifically suited and processed to maintain performance characteristics on par with conventional materials. Therefore, increasing the asphalt binder content directly impacts the durability and longevity of the asphalt mixture, making it a key practice in asphalt pavement design.