DETERMINATION OF CONCRETE PAVEMENT SURFACE LAYER MODULUS AND THICKNESS USING NONDESTRUCTIVE DEFLECTION TESTING

A method of estimating the modulus and thickness of concrete pavement surface layer directly from nondestructive (NDT) deflection testing has been developed at the New York State Department of Transportation (NYSDOT). This method is fast and requires no backcalculation techniques for deflection analysis. It is developed from pressure distribution factors at sensor locations based on deflection data obtained in an elastic half-space with known modulus of elasticity. In a portland cement concrete pavement, the deflection changes at shorter distances from load center are less influenced by the underlying layers because of high modulus ratio between the surface and subbase layers. This fact allows one to apply pressure distribution factors to estimate the surface layer thickness and modulus. Surface layer modulus and thickness determined by the new method were validated. Case studies from NYSDOT falling-weight deflectometer testing are presented to demonstrate applicability of the new method. Most importantly, all computations are made with a spreadsheet program requiring no sophisticated computer program. This method provides state highway agencies a useful tool in analyzing NDT deflection data.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/1566769493
• Supplemental Notes:
  • This entry in the TRIS database is made from the hardback copy of the conference proceedings, which are also available on CD-ROM.
• Corporate Authors:

  Technomic Publishing Company, Incorporated

  851 New Holland Avenue, Box 3535
  Lancaster, PA  United States  17604
• Authors:
  • Hossain, M M
  • Yang, W-S
• Conference:
  • Structural Materials Technology IV - An NDT Conference
  • Location: Atlantic City, New Jersey
  • Date: 2000-2-28 to 2000-3-3
• Publication Date: 2000

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 133-138

Subject/Index Terms

• TRT Terms: Case studies; Concrete pavements; Deflection tests; Falling weight deflectometers; Modulus of elasticity; Nondestructive tests; Spreadsheets; Surface course (Pavements); Thickness; Validation
• Uncontrolled Terms: Pressure distribution factors
• Geographic Terms: New York (State)
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00793115
• Record Type: Publication
• ISBN: 1566769493
• Files: TRIS
• Created Date: May 3 2000 12:00AM