Guayule Plant Extracts as Recycling Agents in Hot Mix Asphalt with High Reclaimed Binder Content


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.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Asphalts; Binders (Materials); Biobinder; Recycling

International Standard Serial Number (ISSN)

0899-1561; 1943-5533

Document Type

Article - Journal

Document Version


File Type





© 2014 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Jan 2014