Performance Based Selection of RAP-RAS in Asphalt Mixtures
Record Type: DOT
The Oregon Department of Transportation (ODOT) currently uses recycled asphalt materials (RAM), which are is typically recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS), to help reduce the costs. The current limits on RAM are restricted based upon local and national experience. The intent of this study is to use performance based tests to evaluate mixtures with increased RAM content, resulting in minimizing the potential cost, and providing environmental and performance benefits. ODOT currently allows the use of RAM in its hot mix asphalt concrete (HMAC) without any adjustments to the virgin binder grade. The effect of the recycled asphalts on the final binder grading is unknown. This may lead to a HMAC product that is more susceptible to early fatigue or thermal cracking. This study will also explore approaches to evaluate the selection of appropriate binder grade.
Start date: 2012/7/1
Status: Active
Contract/Grant Number: SPR 755
Total Dollars: 160000
Source Organization: Oregon Department of Transportation
Date Added: 07/12/2012
Index Terms: Recycled asphalt pavements, Recycled materials, Hot mix paving mixtures, Mix design, Binder content, Thermal cracking,
|
