Interim Report: Binder Rheology and Performance in Warm Mix Asphalt
Since the introduction of warm mix asphalt (WMA) in the United States, a variety of different technologies and processes have been developed and used to achieve proper mixing and compaction at reduced temperatures compared to conventional hot mix asphalt. A better understanding of the effect of WMA additives and reduced aging on rheology of asphalt binders is a crucial step towards the successful implementation of WMA. This report presents the preliminary findings from a study conducted to investigate the influence of chemical WMA additives and reduced aging on the viscosity, stiffness, susceptibility to permanent deformation, fracture resistance, and thermal cracking resistance of asphalt binders. Short-term aged WMA binders have reduced stiffness compared to conventional binders due to the reduced mixing temperatures. However, preliminary results indicate that certain WMA additives tend to exacerbate the reduced stiffness of WMA while other WMA additives tend to compensate for this effect. In most cases, long-term aged WMA binders had a similar stiffness but similar or reduced strength compared to conventional binders at intermediate temperatures. Also, the long-term aged WMA binders had similar or slightly reduced resistance to low-temperature cracking compared to conventional binders. In most cases, the use of WMA with recycled asphalt rendered the asphalt binder slightly more susceptible to low-temperature cracking.
- Record URL:
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Supplemental Notes:
- Project Title: Developing a Fundamental Understanding of the Chemistry of Warm Mix Additive. Report Date: January 2012; Published: August 2012.
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Corporate Authors:
University of Texas, Austin
Center for Transportation Research, 1616 Guadalupe Street
Austin, TX United States 78701-1255Texas Department of Transportation
Research and Technology Implementation Office, P.O. Box 5080
Austin, TX United States 78763-5080Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Arega, Zelalem
- Bhasin, Amit
- Publication Date: 2012-8
Language
- English
Media Info
- Media Type: Web
- Edition: Technical Report
- Features: Figures; Photos; References; Tables;
- Pagination: 94p
Subject/Index Terms
- TRT Terms: Aging (Materials); Asphalt additives; Bituminous binders; Cracking; Low temperature; Rheology; Rutting; Stiffness; Warm mix paving mixtures
- Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 01446460
- Record Type: Publication
- Report/Paper Numbers: FHWA/TX-12/0-6591-2, Report 0-6591-2
- Contract Numbers: Project 0-6591
- Files: TRIS, USDOT, STATEDOT
- Created Date: Sep 18 2012 3:56PM