You are being redirected because this document is part of your ASTM Compass® subscription.
This document is part of your ASTM Compass® subscription.
Volume 40, Issue 7 (December 2012)
Special Issue Paper
Relationship between Degree of Anisotropy of Asphalt Concrete and Its Geometrical Parameters
(Received 8 May 2012; accepted 7 June 2012)
Published Online: 2012
For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.
For Microsoft Word
The property of anisotropy is an inherent characteristic of asphalt concrete (AC) and is mainly created by the nonuniform distribution of aggregates. Although there are some previous studies on the subject, a universal anisotropic model is still unavailable. This paper selects an AC type frequently used in China, AC-20, and tries to establish a usable statistic regression relation to predict the degree of anisotropy. Specimens are fabricated and tested. Then regression equations are obtained, and the effects of different geometrical parameters are investigated. It can be concluded that the average long axis angle is more important than deviation from the gravity center. In resilient modulus experiments of this research, the anisotropic degree of AC-20 ranges from 0.78 to 0.85. It comes mainly from the largest granules in aggregates. The AC type that has the smaller nominal maximum particle size will have less anisotropic tendency. As for AC-20, the anisotropy tendency will be neutralized by granules smaller than 13.2 mm, and the most effective granules have sizes between 4.75 mm and 9.5 mm.
Assistant Professor, Dept. of Highway and Railway Engineering, Univ. of Southeast, Jiangsu,
Dept. of Highway and Railway Engineering, Univ. of Southeast, Jiangsu,
Stock #: JTE20120144
Title Relationship between Degree of Anisotropy of Asphalt Concrete and Its Geometrical Parameters