Use of falling weight deflectometer multi-load data for pavement strength estimation

Details

• Alternative Title:
  Use of FWD multi-load data for pavement strength estimation
• Creators:
  Kim, Y. R. ; Park, H.
• Corporate Creators:
  North Carolina State University. Department of Civil Engineering ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Deflection Falling Weight Deflectometers Fatigue(Materials) Flexible Pavements FWD(Falling Weight Deflectometers) Loads(Forces) Materials Tests Measuring Instruments Pavement Conditions Pavement Performance Pavement Strength Performance Tests Stress Analysis

  More +
• Publication/ Report Number:
  FHWA/NC/2002-006
• Resource Type:
  Research Paper
• Geographical Coverage:
  North Carolina
• Edition:
  Final Report; July 1999 - June 2001
• Corporate Publisher:
  North Carolina. Dept. of Transportation
• Abstract:
  The objective of this study is to develop a mechanistic-empirical method for assessing pavement layer conditions and
  
  estimating the remaining life of flexible pavements using multi-load level Falling Weight Deflectometer (FWD) deflections. A
  
  dynamic finite element program, incorporating a stress-dependent soil model, was developed to generate the synthetic deflection
  
  database. Based on this synthetic database, the relationships between surface deflections and critical pavement responses, such as
  
  stresses and strains in each individual layer, have been established. A condition assessment procedure for asphalt pavements that
  
  uses multi-load level FWD deflections has been developed using these relationships. The verification study was conducted using
  
  field data. The results indicate that the proposed procedure can estimate the base and subgrade layer conditions. It was found
  
  from the study for the nonlinear behavior of a pavement structure that an FWD test with a load of 12 kip or less does not result in
  
  any apparent nonlinear behavior of the subgrade in aggregate base pavements. The study also indicated that the deflection ratio
  
  obtained from multi-load level deflections may predict the type and quality of the base/subgrade materials. With regard to the
  
  condition assessment of the asphalt concrete (AC) layer, the AC layer modulus and the tensile strain at the bottom of the AC
  
  layer were found to be better indicators than deflection basin parameters.
  
  The procedures for performance prediction of fatigue cracking and rutting were developed for flexible pavements. The
  
  drastically increasing trend in fatigue cracking with time may not be predicted accurately using the proposed procedure. Such
  
  trends may be due to the environmental effects and the inconsistent distress measurements. Predicted rut depths using multi-load
  
  level deflections show good agreement with measured rut depths over a wide range of rutting. However, the procedure using
  
  single load level deflections consistently underpredicts the rut depths. It was concluded that the rutting prediction procedure
  
  using multi-load level deflections can estimate an excessive level of rutting quite well and, thus, improve the quality of prediction
  
  for rutting potential in flexible pavements.
  
  The layer condition assessment procedure and the remaining life prediction algorithms developed in this project were
  
  incorporated into APLCAP (Asphalt Pavement Layer Condition Assessment Program) version 2.0, the VisualBasic program
  
  developed under the NCHRP 10-48 project.
  
  
• Format:
  PDF
• Funding:
  HWY-00-04
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:245f78c2b35fef222bdf996c1255782a9072cbd777dbbadf34711f56028236bb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/5253/dot_5253_DS1.pdf
• File Type:
  [PDF - 3.63 MB ]