What is aggregate segregation in an HMA mat, and where does it most often start?

1. A uniform rich film of binder over the entire surface, usually from too much tack
2. Separation of coarse and fine particles, often beginning at truck loading, truck exchange, or the paver hopper wings
3. Air voids that are too low because the breakdown roller made too many passes
4. A laboratory-only problem that cannot appear in the finished roadway