Increased usage of reclaimed asphalt pavement (RAP) and reclaimed asphalt roofing shingles (RAS) in hot mix asphalt (HMA) has increased the need for recycling agents intended to return the age-hardened RAP/RAS binder (asphalt) to its original state. However, a decreasing supply of liquid asphalt and concerns over adverse health effects when using petroleum-based recycling agents have created the opportunity for bio-based solutions to these issues. the guayule plant is a woody perennial shrub that is native to areas of the southwestern U.S. and is a well-documented source of resin and high-quality rubber. the study objective was to determine the viability of using guayule-based materials as recycling agents in HMAs with high contents of RAP and/or RAS. of the many guayule-based materials investigated, an acetone-extractable, residual resin in the rubber was shown to be effective in meeting the study objective.
- Binders (Materials),
Available at: http://works.bepress.com/david_richardson/72/