DEFLECTION STUDY AND DESIGN OF CRACK AND SEAT PAVEMENT REHABILITATION

A study of the deflection performance of cracked and seated and rubblized portland cement concrete pavements was conducted in response to failure of one crack and seat project during construction. Deflection testing was conducted using one or more Dynatest falling weight deflectometers and a 4,086-kg (9,000-lb) target load. Six of the eight crack and seat or rubblized projects built in North Carolina since 1990 were tested on one or more occasions. The projects included guillotine-induced crack spacings of 152, 457, 610, 762, and 1,219 mm (6, 18, 24, 30, and 48 in.), along with a rubblization project. The goal of the study was to determine under what conditions crack and seat rehabilitation is likely to perform successfully. Results indicated that uniform backcalculated subgrade moduli of 103,350 kPa (15,000 psi) or higher are one indicator. The importance of design details to the success of the projects was also clear, especially in the area of bridges. The areas of most severe distress noted on the oldest North Carolina project were associated with tapering under a bridge structure and the area of pavement just before the bridge approach slab. Proper location and use of stress relief cuts before crack and seat were also demonstrated on a project tested during construction. Backcalculation was performed on most of the projects to determine the modulus for portland cement concrete (Epcc), the subgrade modulus and the modulus of the asphaltic concrete layers. The results generally confirmed that decreasing the crack spacing decreases the Epcc of the broken slabs, and that rubblization produces an Epcc that is significantly lower than that from crack and seat. Rubblization also produced less deflection variation based on the one project tested.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1995/1513/1513-006.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=DEFLECTION+STUDY+AND+DESIGN+OF+CRACK+AND+SEAT+PAVEMENT+REHABILITATION&author=J.+Corley-Lay&author=T.+Hearne+Jr&author=S.+Wu&publication_year=1995
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1513, Flexible Pavement Construction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Corley-Lay, Judith B
  • Hearne Jr, Thomas M
  • Wu, Shie-Shin
• Publication Date: 1995

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 47-53
• Monograph Title: Flexible pavement construction
• Serial:
  • Transportation Research Record
  • Issue Number: 1513
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Backcalculation; Coefficient of subgrade reaction; Comminution; Concrete pavements; Crack and seat treatment; Cracking; Defects; Deflection tests; Excavations; Falling weight deflectometers; Modulus of elasticity; Overlays (Pavements); Pavement distress; Pavement performance; Pavements; Spacing; Stress relieving
• Uncontrolled Terms: Crack spacing
• Old TRIS Terms: Stress relieving cuts
• Subject Areas: Construction; Data and Information Technology; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00715644
• Record Type: Publication
• ISBN: 0309061733
• Files: TRIS, TRB, ATRI
• Created Date: Jan 24 1996 12:00AM