Sand mix interlayer retarding reflective cracking in asphalt concrete overlay

Jongeun Baek, Imad L. Al-Qadi

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

This study evaluated the performance effectivenss of sand mix interlayer in controlling reflective cracking in asphalt concrete (AC) overlaid existing jointed concrete pavement (JCP) using a three-dimentional finite element (FE) model. A cohesive zone model was incorporated into the FE model to characterize the fracture behavior of the AC overlay under transient vehicular loading. A limit state load approach was used to determine the resistance of the AC overlay to reflective cracking in terms of normalized axle load of an overload equivalent to an 80-kN single-axle load. The study concluded that the sand mix interlayer enhanced the fracture resistance of the AC overlay due to its relatively high fracture energy. A macro-crack level of reflective cracking was initiated in the wearing course in the AC overlay earlier than in the leveling binder, so-called crack jumping. The softer the sand mix, the tougher it may be, but it may cause shear rutting in the AC overlay. As the bearing capacity of the JCP becomes lower, more fractured area was developed in the AC overlay and the performance effectiveness of the sand mix interlayer was better.

Original languageEnglish (US)
Title of host publication"7th RILEM International Conference on Cracking in Pavements
Subtitle of host publicationMechanisms, Modeling, Testing, Detection,Prevention and Case Histories
EditorsA.(Tom) Scarpas, Niki Kringos, Imad L. Al-Qadi, Andreas Loizos
Pages1241-1250
Number of pages10
StatePublished - Dec 1 2012

Publication series

NameRILEM Bookseries
Volume4
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials

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