PMSS Project Details

Project ID:	FHWA-PROJ-06-0028
Project Name:	Asphalt Modification with Phosphoric Acid
Status:	Active
Contact:	Last Name: Arnold First Name: Terry Telephone: 202-493-3305 E-mail: terry.arnold@dot.gov
Organization:	Federal Highway Administration - Turner-Fairbank Highway Research Center (TFHRC)
Office:	Office of Infrastructure Research and Development
Team:	Pavement Materials Team
Roadmap/Focus area(s):	Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:	This project continues ongoing research activity that will provide guidance to State agencies and industry partners on the appropriate use of phosphoric acid as an asphalt modifier. Issues still not clearly resolved are the reaction of phosphoric acid with asphalt from different crude sources, reaction with lime and limestone aggregates, and the effect on rutting and fatigue. The comparison of phosphoric acid modification with polymer modification needs to be augmented. There are also unresolved forensic issues in New York State concerning phosphoric acid and premature pavement failures. Until this is resolved, other State agencies will likely reject the use of this potentially cost-saving additive.
Laboratories:	Binder Laboratory Bituminous Mixtures Laboratory Chemistry Laboratory
Start Date:	December 6, 2006
End Date:	December 31, 2011
Funding Amount:	$0.00
FHWA Program Name:	Turner-Fairbank Highway Research Center
Goals:	Material Characterization
Project Type:	Onsite
Background Information:	Data not yet available
Test Methodology:	Various chemical and spectroscopic techniques, including x-ray fluorescence, ion-exchange chromatography, atomic absorption spectroscopy, and infrared spectroscopy.
Other Information:	Data not yet available
Partners:	Data not yet available
More Information URL(s):
Fieldtest:	Data not yet available
Expected Benefits:	The expected benefit is reduced construction costs by using phosphoric acid as an alternative to polymer modification. Currently there is a shortage of Styrene-Butadiene-Styrene for modifying asphalt binders, so there is a dire need to identify modes of asphalt modification that fill this gap. In many circumstances, phosphoric acid modification has this potential.
Deliverables:	Name: Final Report. Product Type(s): Research report Description: The product is a final report providing best practice guidelines for the use of phosphoric acid to modify asphalt. Audiences: State highway agencies Secondary Audiences:
Related URL(s):
Project Findings:	Data not yet available
FHWA Topics:	Roads and Bridges--Pavement and Materials Research/Technologies--Turner-Fairbank Highway Research Center (TFHRC)
TRT Terms:	Asphalt Modification Phosphoric Acid Infrastructure Asphalt Pavements Binders Styrene Butadiene Styrene Research
FHWA Disciplines:	Pavement and Materials
Subject Areas:	Materials