Improving the accuracy and usability of Iowa falling weight deflectometer data.

Details

• Creators:
  Ceylan, Halil ; Gopalakrishnan, Kasthurirangan ; Kim, Sunghwan
• Corporate Creators:
  Iowa State University. Institute for Transportation
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Accuracy Asset Management Backcalculation Falling Weight Deflectometers Hot Mix Asphalt Overlays (Pavements) Pavement Layers Portland Cement Concrete Software
• Publication/ Report Number:
  InTrans Project 11-415
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  Iowa. Dept. of Transportation
• Abstract:
  This study aims to improve the accuracy and usability of Iowa Falling Weight Deflectometer (FWD) data by incorporating significant
  
  enhancements into the fully-automated software system for rapid processing of the FWD data. These enhancements include: (1) refined
  
  prediction of backcalculated pavement layer modulus through deflection basin matching/optimization, (2) temperature correction of
  
  backcalculated Hot-Mix Asphalt (HMA) layer modulus, (3) computation of 1993 AASHTO design guide related effective SN (SNeff)
  
  and effective k-value (keff ), (4) computation of Iowa DOT asphalt concrete (AC) overlay design related Structural Rating (SR) and kvalue
  
  (k), and (5) enhancement of user-friendliness of input and output from the software tool. A high-quality, easy-to-use
  
  backcalculation software package, referred to as, I-BACK: the Iowa Pavement Backcalculation Software, was developed to achieve the
  
  project goals and requirements. This report presents theoretical background behind the incorporated enhancements as well as guidance
  
  on the use of I-BACK developed in this study. The developed tool, I-BACK, provides more fine-tuned ANN pavement backcalculation
  
  results by implementation of deflection basin matching optimizer for conventional flexible, full-depth, rigid, and composite pavements.
  
  Implementation of this tool within Iowa DOT will facilitate accurate pavement structural evaluation and rehabilitation designs for
  
  pavement/asset management purposes. This research has also set the framework for the development of a simplified FWD deflection
  
  based HMA overlay design procedure which is one of the recommended areas for future research.
  
  
• Format:
  PDF
• Funding:
  SPR 90-00-RB04-012
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:26904fbc6e6a5a34be7aa9ff0ab48a0080fc51cfe6db49683953553a9d47cb0d5346138e160ceedc7da13335113b64f2212963e149cd647f361a05b99d551ffa
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26282/dot_26282_DS1.pdf
• File Type:
  [PDF - 2.85 MB ]