Material Transfer System Moves HMA from Hopper to Screed Efficiently

Getting the hot mix asphalt properly and efficiently from the haul truck to the screed might be the most important job of the paver. This article provides an overview of a paver's material handling system, how it works, and how that affects what the screed can do for a contractor. Starting at the front, where the haul truck meets the paver, there are the hopper and the hopper aprons. The capacity of the hopper will affect the types and sizes of jobs the contractor can complete with that paver. The hopper apron, which is in front of the hopper between the hopper and the haul truck, prevents hot mix dumped from the truck from falling onto the pavement. Once dumped into the hopper, the mix must be moved to the screed. It is important to move the mix quickly so it maintains its heat and evenly so a consistent head of material is brought to the screed. The material also must be moved in bulk to avoid segregation. Pavers get this done through the use of conveyors. The hopper and the conveyors are closely linked. The conveyors move material from the bottom of the hopper, and paddles or noncontact sensors automate the conveyor to keep material moving steadily to the screed. The conveyor moves the hot mix asphalt from the hopper to the auger assembly. The augers, which operate perpendicular to the conveyor, look somewhat like threads on a screw. As the augers turn they pick up mix in their "threads" and carry it from the conveyor to either the left or the right side of the rear of the paver. Auger extensions can be used to pave wider widths.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01147434
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 29 2009 10:05PM