Hot in-Place Recycling (HIR) to Repair Your Roads

Preheater Units 

• One or more preheater units to dry, heat and soften the existing pavement

• To prevent overheating and damage to the existing pavement, lower heat sources and longer heating times are required

• This is accomplished by slowing the production rate or using additional preheaters

Heater/Scarification/Milling Units

• These follow preheater units
• Used in Surface Recycling and with modifications for Remixing and Repaving
• Add the final heating
• Loosen or scarify the softened pavement using spring loaded tines, carbide teeth, augers and moldboard, hot milling drums or carbide tipped scarifying teeth

Remixing Unit

• Heater/scarification unit with a mixing drum or pugmill

• Allows addition of new aggregate or HMA

Repaving Unit

• Consists of specialized heater/scarification unit that contains double screed

• First screed placed the recycled mix, while the temperature of the recycled material is at least 225 ^oF.

• Second screed placed new HMA immediately on top of recycled layer resulting in thermally bonded layers

Haul Trucks

• New aggregate for HIR Remixing

• New HMA for HIR Remixing or Repaving

Paver

• Places recycled mix to required grade and cross-slope (Surface Recycle and Remix only) 

Compaction Equipment

• Rubber-tired rollers

• Steel wheel rollers