Full Depth Reclamation (FDR) uses the old asphalt mixed with a base material to construct a new road. There’s no need to haul in aggregate or haul out old material for disposal. A surface consisting of a thin bituminous chip seal, hot-mix asphalt, or concrete completes the road. The recycled base will be stronger, more uniform, and more moisture resistant than the original base, resulting in a long, low-maintenance life. Truck traffic is reduced and there is little to no waste, with this process. Most importantly, recycling costs are typically 25% to 50% less than the costs of removal and replacement of old pavement. This recycling method saves money and natural resources.
The currently-employed technologies for this type of soil stabilization include multiple alternatives.
One choice involves the pulverization and homogenization of existing materials in-place, without the addition of an additive to change or improve the characteristics of the material. This technique is typically performed when the in-situ material is suitable and when FDR can create a new stabilized base of sufficient thickness and strength for intended traffic loads.
A second technique for FDR stabilization includes the addition of a single additive such as Class C fly ash or cement. This process rebuilds worn out asphalt pavements by recycling the existing roadway. The old asphalt and base materials are pulverized, mixed with either cement or Class C fly ash and water, and then compacted to produce a strong, durable base for either an asphalt or concrete surface.