Abstract
The objective of this study was to determine if warm mix additives currently used in Arizona can be added for the production of an Asphalt Rubber - Asphaltic Concrete Friction Course (AR-ACFC) without detrimental effects on performance of the pavement. Three warm mix additives (Evotherm®, Sasobit®, and Advera®) approved by Arizona Department of Transportation were investigated through a laboratory study along with statistical analysis. Three major concerns on performance of an AR-ACFC considered in this study are asphalt draindown, durability, and moisture susceptibility. The laboratory binder test results show there is no clear evidence that the use of Evotherm and Sasobit additives negatively affect the binder characteristic. However, the use of Sasobit may need to be evaluated carefully because it tends to increase the binder stiffness at elevated temperatures. The mix performance test results show all additives do not have any detrimental effects on AR-ACFC mixes when draindown and moisture damage are concerned. For durability, the Evotherm and Sasobit mixes may cause more abrasion than regular AR ACFC mixes, when the dosage level is deviated from the target level. With a target dosage, no negative impact is observed for all additives.
Recommended Citation
Jeong, Michael Myung and Hanson, Douglas I.
(2017)
"A Laboratory Evaluation of Warm Mix Technology for
Use in Asphalt Rubber - Asphaltic Concrete Friction Courses: A Case Study of Arizona,"
The Professional Constructor: Vol. 42:
No.
1, Article 2.
Available at:
https://open.clemson.edu/aic-journal/vol42/iss1/2
