Recycling payment methods and different streategies among states in the USA.
Pavement Project
1. Conduct a literature review to see how asphalt recycling methods implemented as maintenance and rehabilitation strategies by other states. Report this Literature Review.
Five broad categories have been defined by Asphalt Recycling and Reclaiming Association (ARRA) are:
· Hot Recycling (HR)
· Cold Planing or Milling(CP)
· Hot In-place Recycling(HIR)
· Cold Recycling (CR) that includes Cold-In Place Recycling(CIR) and Cold Central Plant Recycling(CCPR)
· Full Depth Reclamation (FDR)
The Federal Highway Administration (FHWA) supports and promotes the use of recycled highway materials (RAP) in pavement construction to preserve the natural environment, reduce waste, and provide a cost-effective material for constructing highways. The primary objective is to encourage the use of recycled materials in the construction of highways to the maximum economical and practical extent possible with equal or improved performance.
Benefits of RAP (reclaimed asphalt pavement) asphalt pavements include economics, conservation of natural resources (aggregate, binder, and fuel), reduction in energy consumption, and a decrease in emissions (including greenhouse gases
Instead of reconstruction which allows a useful life of 20 years.
In Florida, Mill & Fill is a commonly used structural pavement treatment that involves the removal of the existing surface layer with a milling machine (CP) and the replacement of the milled location with new asphalt. Reconstruction is another conventional method that involves the complete replacement of the road with new asphalt which can have a useful life upwards of 20 years. On the other hand, the benefits of using recycled asphalt materials (RAP) in asphalt pavements include economics, conservation of natural resources (aggregate, binder, and fuel), reduction in energy consumption, and a decrease in emissions (including greenhouse gases).
Thus, there is a need to investigate the efficiency of asphalt recycling solutions with reclaimed asphalt pavement in Florida.
The conventional solution to this problem is reconstructing the pavement structure. Full-Depth Reclamation (FDR) is the recycling solution to be considered.
https://www.fhwa.dot.gov/pavement/recycling/98042/01.cfm
https://www.fhwa.dot.gov/publications/research/infrastructure/pavements/11021/11021.pdf
https://www.fhwa.dot.gov/pavement/recycling/
https://www.fhwa.dot.gov/Pavement/recycling/rap/index.cfm
Implicit recycling methods are not popular. Florida decided to follow standards, which is milling. Applies hot mix at the end.
Look for the professor’s publications. Analyze longevity and cost, of both methods. Recycling and conventionally.