Two-Step Fracture Mechanics–Based Approach to Assess Early-Age Delamination Distress

The development of a comprehensive, early-age delamination model requires an integration of interfacial strength of the aggregate–mortar interface and environmental, materials, and construction effects. Previous research has led to the establishment of the model’s mechanism that can be characterized with engineering mechanics. However, fracture mechanics theory, which is more suitable to represent the delamination process, has not been widely applied to concrete pavement analysis. A two-step fracture mechanics–based model was developed to predict the occurrence potential of delamination in continuously reinforced concrete pavements. The model is based on the comparison between the stress intensity factor (K sub I) and fracture toughness (K sub IC). The development of the K sub I of concrete at an early age was simulated through a two-step numerical analysis, including (a) a coupled thermal–hygro analysis to predict the temperature and moisture profiles and the associated material properties and (b) a coupled hygro–mechanical stress analysis to predict the differential drying shrinkage-induced stress. This model addressed the integration of effects of environment, materials, and construction factors through key parameters that included moisture diffusivity, shrinkage strain gradient, pavement thickness, and elastic modulus of concrete.

• Record URL:
  • https://doi.org/10.3141/2016-09
• 
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Two-Step+Fracture+Mechanics%e2%ac%1cBased+Approach+to+Assess+Early-Age+Delamination+Distress&author=J.+Liu&author=X.+Zhang&author=D.+Zollinger&publication_year=2007
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309104432
• Authors:
  • Liu, Juanyu
  • Zhang, Xiong
  • Zollinger, Dan G
• Publication Date: 2007

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References;
• Pagination: pp 76-84
• Monograph Title: Geology and Properties of Earth Materials 2007
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2016
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Continuously reinforced concrete pavements; Delamination; Fracture mechanics; Fracture properties; Mathematical models; Modulus of elasticity; Moisture content; Pavement distress; Shrinkage; Temperature; Thickness
• Uncontrolled Terms: Early age (Concrete); Stress intensity factor
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 01043827
• Record Type: Publication
• ISBN: 9780309104432
• Files: TRIS, TRB, ATRI
• Created Date: Mar 12 2007 8:09AM