ISSN: 0090-3973
Page Count: 9

Effect of Antistrip Additives on Surface Free Energy Characteristics of Asphalt Binders for Moisture-Induced Damage Potential

Wasiuddin, NM
Doctoral Candidate,School of Civil,

Fogle, CM
Graduate Student,School of Chemical,,

Zaman, MM
David Ross Boyd Professor and Aaron Alexander Professor,,

O'Rear, EA
Francis W. Winn Professor,School of,

(Received 23 January 2006; accepted 18 April 2006)

Abstract

In this study, the effect of antistrip additives on asphalt binders was evaluated by both laboratory tests and a proposed chemical model of asphalt binder based on the surface free energy characteristics. Two performance graded asphalt binders, namely, PG 64-22 and PG 70-28 and two amine-based liquid antistrip additives, namely, AD-Here HP Plus and Redicote E-6 were evaluated at different percentages (0.25 %, 0.75 %, and 1.5 %). It was found that 1.5 %AD-Here HP Plus and 1.5 % Redicote E-6 increased the total SFE of PG 64-22 by 67 % and 208 %, respectively. Also, the acid components of PG 64-22 and PG 70-28 are 2.9 dyne/cm and 2.5 dyne/cm, respectively, whereas, the corresponding base components are 0.4 dyne/cm for both. With the addition of 1.5 %. Redicote E-6 in PG 64-22, the acid component of the binder reduced by 92 % and the base component of the binder increased by 1141 %.

Keywords:
asphalt binder, moisture-induced damage, antistrip additives, surface free energy, dynamic Wilhelmy plate method, contact angle, acid, base

Paper ID: JTE100290
DOI: 10.1520/JTE100290
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