TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Polyphosphoric Acid Modification of Asphalt Binders: A Workshop. Workshop Summary
Cover of Polyphosphoric Acid Modification of Asphalt Binders: A Workshop. Workshop Summary

Accession Number:

01363319

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/issn/00978515

Abstract:

At the Workshop on Polyphosphoric Acid Modification of Asphalt Binders, held in April 2009, researchers and practitioners presented the latest information on polyphosphoric acid (PPA) modification and performance characteristics. The PPA workshop covered extensive laboratory and field evaluations on the use of PPA as a modifier for asphalt binder. The following points were made by various workshop participants during the discussions: the stiffening effect of PPA on the binder is crude source dependent with anywhere from 0.5% to more than 3% needed to increase the binder grade; PPA works as a stiffener and cross-linker when used with polymers such as styrene butadiene styrene and ethylene terpolymers; PPA can significantly improve the delayed elastic response of the polymer-modified binder; there is some indication that hydrated lime can somewhat reduce the stiffening effect of PPA but the increased stiffening from the lime outweighs any loss; and limestone aggregate could not reverse or reduce the stiffening effect of PPA on the binder. Several laboratory studies evaluated the moisture damage potential of mixes produced with PPA-modified binders, finding that below the application rate of 1.5% there did not appear to be any increase in moisture damage potential. Extensive field testing has shown no negative performance related to PPA. Several states that have used PPA extensively indicated that there have been no instances of negative pavement performance issues that can be attributed to the PPA.

Monograph Accession #:

01363314

Language:

English

Authors:

D'Angelo, John A

Pagination:

pp 1-7

Publication Date:

2012-1

Serial:

Transportation Research Circular

Issue Number: E-C160
Publisher: Transportation Research Board
ISSN: 0097-8515

Conference:

Workshop on Polyphosphoric Acid Modification of Asphalt Binders

Location: Minneapolis Minnesota, United States
Date: 2009-4-7 to 2009-4-8
Sponsors: Transportation Research Board; Federal Highway Administration; Minnesota Department of Transportation

Media Type:

Digital/other

Uncontrolled Terms:

Polyphosphoric acid; Stiffening

Subject Areas:

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Feb 23 2012 7:39AM

More Articles from this Serial Issue: