University of Illinois Urbana-Champaign

Structural Performance of Ultra-Thin Whitetopping on Illinois Roadways and Parking Lots

King, Daniel; Roesler, Jeffrey

Content Files
FHWA-ICT-14-018.pdf

Permalink

https://hdl.handle.net/2142/50312

Description

Title
Structural Performance of Ultra-Thin Whitetopping on Illinois Roadways and Parking Lots
Author(s)
  • King, Daniel
  • Roesler, Jeffrey
Issue Date
2014-08
Keyword(s)
  • ultra-thin whitetopping
  • bonded concrete overlays
  • visual distress survey
  • backcalculations
  • falling weight deflectometer
  • non-destructive testing
Date of Ingest
2014-09-09T20:18:06Z
Geographic Coverage
Illinois
Abstract
A performance evaluation of ultra-thin whitetopping (UTW) pavements in Illinois was undertaken in 2012–2014 to evaluate current design procedures and to determine design life criteria for future projects. The two main components of this evaluation were (1) visual distress surveys of 20 existing UTW projects across the state to document and quantify distresses and (2) falling weight deflectometer (FWD) testing of eight of these UTW projects to evaluate structural performance. The findings of the surveys are detailed in this report. Deflection data collected during FWD testing were used to directly calculate load transfer efficiency and assess joint performance, but there was no existing method to assess the in situ structural properties of UTW pavements. To better characterize structural performance, a backcalculation procedure for UTW pavements was derived and applied to the deflection data obtained from FWD testing. The backcalculated effective concrete thickness quantifies the load carrying capacity of the UTW pavement, variation of the structural capacity as a function of distance along the roadway, and potentially the condition of the concrete–asphalt bond interface and the underlying asphalt concrete layer. The findings of the visual distress surveys and the FWD data analysis largely agreed with each other and were studied to help provide a greater understanding of factors that affect UTW performance. From this analysis, a number of conclusions and recommendations were made regarding UTW pavement design and construction.
Publisher
Illinois Center for Transportation/Illinois Department of Transportation
Series/Report Name or Number
Illinois Center for Transportation Series No. 14-020. Research Report No. FHWA-ICT-14-018
ISSN
0197-9191
Type of Resource
text
Genre of Resource
Technical Report
Language
en
Permalink
http://hdl.handle.net/2142/50312
Sponsor(s)/Grant Number(s)
Illinois Department of Transportation, R27-061
Copyright and License Information
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161.

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Research and Publications - Illinois Center for Transportation PRIMARY