Which heavy equipment is NOT used in the asphalting process?

In the context of the asphalting process, an excavator is typically not involved. This heavy equipment is primarily designed for digging and material handling, making it more suited for excavation and earthmoving tasks rather than for the specific functions of laying down asphalt or finishing pavement surfaces.

In contrast, the distributor truck is essential for applying the asphalt binder evenly across the surface. The paver plays a critical role in spreading and leveling the asphalt mixture, ensuring a smooth and uniform layer. The pneumatic roller is used for compacting the asphalt, helping to achieve the desired density and surface finish. Each of these equipment types serves a direct purpose in the asphalting process, while the excavator does not contribute to those specific functions, which is why it is the correct answer.