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Title:

Effect of Polyphosphoric Acid on Asphalt Binders with Different Chemical Composition

Accession Number:

01555093

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Additives have been incorporated into asphalt binders in order to improve pavement performance and, among the new technologies, the polyphosphoric acid (PPA) is a promising product. As PPA supposedly reacts with asphaltenes, the mechanism of PPA modification depends strongly on the chemical composition of the base asphalt binder. In order to evaluate the impact of PPA modification in asphalt binders from different sources, two 50/70 pen-grade asphalt binders supplied by two Brazilian Refineries (Reduc and Lubnor) have been modified by four PPA proportions (0.5, 1.0, 1.5, 2.0%). Both asphalt binders present different performance grade (PG) and different chemical compositions. The saturates, aromatics, resins, and asphaltenes (SARA) fractions were determined using the thin-layer chromatography in order to assess the chemical changes provided by PPA addition. The multiple stress creep recovery (MSCR) test and the new linear amplitude sweep (LAS) test were used to evaluate the effect of PPA content on the rutting and fatigue performance. The main effects of PPA addition observed for both asphalt binders are: (1) increase of percent recovery, (2) decrease of non-recoverable compliance, (3) increase of J <sub>nr, diff</sub> values without exceeding 75%, (4) increase of the traffic level to which the pavement can be subjected, and (5) increase of the tolerance to fatigue damage. High PPA proportions do not show significant effect on asphalt binders with a high colloidal index, however, PPA addition seems to be capable of improving substantially the rheological properties of asphalt binders with a low colloidal index.

Supplemental Notes:

This paper was sponsored by TRB committee AFK20 Characteristics of Asphalt Materials.

Monograph Accession #:

01550057

Report/Paper Numbers:

15-4635

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Pamplona, Thais Ferreira
Faxina, Adalberto Leandro

Pagination:

11p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

References; Tables

Uncontrolled Terms:

Polyphosphoric acid

Subject Areas:

Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I33: Other Materials used in Pavement Layers

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-4635

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 1:32PM