Behavior of concrete mixtures in ultra-thin whitetopping composite pavements

Amanda Bordelon, Jeffery Roesler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ultra-thin whitetopping (UTW) is an alternative pavement rehabilitation option to asphalt concrete overlays. UTW is typically a concrete overlay less than 5 inches thick on an existing distressed asphalt pavement. A research project was recently finished to refine the current UTW design methods and develop new recommendations for improved UTW performance. As part of this project, a laboratory study investigated various concrete mixture effects on UTW performance. Seven mixture designs containing various w/cm ratios, cementitious content, discrete fiber-reinforcement content, and two coarse aggregate types were studied. A composite beam test (concrete placed on an existing asphalt beam) was developed to predict the composite section behavior in the laboratory. For this small-scale 2D testing, the results were not as dramatic as expected between the different concrete mixtures. However, the fiber-reinforcement, which increased the total fracture energy of concrete, demonstrated improvement in the load carrying capacity after initial cracking. The concrete mixture design alone was not the sole indicator of the UTW performance. Higher strength concrete mixtures can fracture just as rapidly as normal strength concrete if the UTW exhibits debonding. It is recommended that structural fibers be added to the concrete to extend the performance life of the rehabilitated pavement, especially in the presence of existing asphalt cracks and potential interface debonding.

Original languageEnglish (US)
Title of host publication9th International Conference on Concrete Pavements
Subtitle of host publicationThe Golden Gate to Tomorrow's Concrete Pavements
Pages591-607
Number of pages17
StatePublished - Dec 1 2008
Event9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements - San Francisco, CA, United States
Duration: Aug 17 2008Aug 21 2008

Publication series

Name9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements
Volume2

Other

Other9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements
CountryUnited States
CitySan Francisco, CA
Period8/17/088/21/08

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering
  • Building and Construction
  • Architecture

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  • Cite this

    Bordelon, A., & Roesler, J. (2008). Behavior of concrete mixtures in ultra-thin whitetopping composite pavements. In 9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements (pp. 591-607). (9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements; Vol. 2).