Why is the aggregate gradation important in asphalt mixes?

The aggregate gradation is crucial in asphalt mixes because it directly influences the strength, durability, and workability of the asphalt pavement. A well-graded aggregate mix ensures that the different sizes of aggregates fit together optimally, filling in voids and minimizing air pockets. This compact arrangement contributes to a more stable and durable pavement structure, which can withstand traffic loads without significant deformation or failure.

Additionally, the right gradation enhances the workability of the asphalt mix during the paving process, making it easier to apply and compact effectively. Properly designed gradation can also improve resistance to cracking and rutting, thereby extending the lifespan of the pavement. Therefore, the choice of aggregate gradation is a fundamental aspect of achieving high-quality asphalt pavements.