Asphalt pavement can be recycled for roadway use time and again, offering the same durability as pavements constructed with 100% virgin materials while accomplishing the following:
Forms of asphalt recycling date back to 1915, becoming increasingly popular in the 1970s with the development of the modern milling machine. The U.S. Environmental Protection Agency and the Federal Highway Administration estimate that we recycle more than 80 percent of the 90 million tons of asphalt pavement reclaimed each year in the US.
TxDOT promotes using RAP in many pavement management strategies. For example, the hot mix asphalt specification encourages the use of fractionated RAP while discouraging the use of unfractionated RAP. Fractionated RAP is crushed and sized reclaimed asphalt pavement that has been separated into its constituent aggregate sizes.
TxDOT uses Reclaimed Asphalt Pavement (RAP) in such construction and maintenance applications as the following:
You can estimate the potential savings of blending RAP into asphalt pavement using this worksheet. Note: The worksheet is for informational purposes only. Actual savings will vary based on material costs.
Research and Other Information
|Center for Transportation Research Library|
|Design, Constructability Review and Performance of Dual Base Stabilizer Applications|
|Evaluation and the Use of Waste and Reclaimed Materials in Roadbase Construction|
|Effect of RAP on Binder Properties Using the Superpave System|
|Guideline for Pulverization of Stabilized Bases|
|Performance of Full Depth Recycling Projects in Texas|
|Potential Use of Crushed Concrete and RAP as Backfill for MSE Walls|
|Production Variability Analysis of Hot-Mixed Asphalt Concrete Containing RAP|
|RAP Stockpile Management and Processing in Texas: State of the Practice and Proposed Guidelines|
|Tips for Success with RAP|
|Use of Cold-Recycle RAP Base, Limestone County, Texas|
|Use of Recycled Asphalt Pavement in Texas - CTR 4177|
|SP 340-003 Dense-Graded Hot-Mix Asphalt (Method)|
|SP 341-024 Dense-Graded Hot-Mix Asphalt (QC/QA)|
|Special Specifications for Emulsion Treatment (Road Mixed)|
|SS 3178 Hot In-Place Recycling of Asphalt Concrete Surfaces (HIR)|
|TxDOT 926-77-18 Recycling Of Asphalt Millings By The Cold Central Plant Process|