TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Use of Phosphoric Acid as a Modifier for Hot-Mix Asphalt
Cover of Use of Phosphoric Acid as a Modifier for Hot-Mix Asphalt

Accession Number:

01124380

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The use of phosphoric acid to stiffen paving asphalt has become popular. Several premature paving failures have been attributed to its use, largely based on incomplete information. This has created uncertainty about the hidden pitfalls surrounding the use of this additive. The primary concerns are the effect of different grades of phosphoric acid, reaction with asphalt from different sources, accelerated aging of binders, increased moisture sensitivity and use with antistrip additives. This research seeks to address these issues. Data will be presented to show how the moisture sensitivity increases with increasing levels of acid modification. This is presented in terms of moisture being absorbed into binder and mastic samples as well as the leaching of phosphoric acid from gyratory specimens, a potential source of groundwater pollution particularly at high levels of acid modification. Preconceived notions about the use of phosphoric acid with alkaline antistrip additives and the effect on increased binder oxidation rates are also discussed. Phosphoric acid was found to not increase asphalt oxidation rates. Use with antistrip additives is perfectly feasible if the correct screening tests are conducted before use.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-1564

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Arnold, Terence Stanley
Needham, Susan P
Youtcheff Jr, John S

Pagination:

15p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (3) ; Tables (2)

Uncontrolled Terms:

Moisture sensitivity

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-1564

Files:

PRP, TRIS, TRB

Created Date:

Jan 30 2009 5:48PM