Evaluation of fracture properties of Hot Mix Asphalt

Document Type

Conference Proceeding

Publication Date

12-1-2008

Abstract

One of the major distresses that occur to Hot Mix Asphalt (HMA) is fatigue cracking. It is believed that fatigue cracking occurs due to repeated traffic loading which induce high tensile stresses at the bottom of the asphalt layer. Recently, pavement engineers and researchers have expressed great concern over the cracking of flexible pavements under various traffic loading and environmental conditions. The fracture properties of three asphalt mixtures containing three binder types will be evaluated in this study. Three binders were used, PG 76-22, PG 70-22 polymer modified asphalt and PG 64-22 unmodified binder. Two tests will be used to characterize the mixtures' fractural properties including Indirect Tensile Strength (ITS) and Semi-Circular Bend (SCB). The fracture properties in the ITS test are evaluated using the ultimate indirect tensile strength, strain, and the toughness index. The fracture resistance of the mixtures in the SCB test is measured using the J-integral approach. The results from the three tests are analyzed and compared. For both tests ITS and SCB test, aged specimens achieved lower fracture properties than that for the unaged specimens. Good correlation was observed between the Toughness Index (TI) from the ITS test and the Jc from the SCB test. © 2008 Taylor & Francis Group, London.

Publication Source (Journal or Book title)

Pavement Cracking: Mechanisms, Modeling, Detection, Testing and Case Histories

First Page

427

Last Page

436

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