A Study on the Influence of Asphalt Layer Temperature on TSDD-Measured Deflection Slopes and Deflections

Details

• Creators:
  Nasimifar, Mahdi ; Nadkarni, Atish A.
• Corporate Creators:
  Engineering & Software Consultants, Inc.
• Contributors:
  Sivaneswaran, Nadarajah
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development ; United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
• Subject/TRT Terms:
  Asphalt Pavements Data Collection Deflection Tests Pavement Layers Traffic Speed
• Publication/ Report Number:
  FHWA-HRT-26-057
• Resource Type:
  Tech Report
• Right Statement:
  Public Domain
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Contracting Officer:
  Sivaneswaran, Nadarajah
• Corporate Publisher:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• Abstract:
  Pavement condition assessment is crucial for devising effective maintenance strategies. Traffic speed deflection devices (TSDDs) are increasingly being adopted worldwide for collecting pavement structural data at traffic speed. However, the temperature of the asphalt concrete layer during measurements can significantly affect TSDD readings, necessitating temperature adjustment for proper data interpretation. While previous research has addressed temperature adjustments for certain deflection-based indices, such as the surface curvature index obtained from specific devices such as the traffic speed deflectometer (TSD), many other deflection and deflection slope parameters remain unexplored. This study addresses that gap by investigating the effect of temperature on deflections and deflection slopes collected along the midline of dual tires under a moving load. The methodology involves creating a comprehensive dataset through simulated TSDD measurements across a range of pavement structures and temperatures. For this study, the research team used the Long-Term Pavement Performance database to develop a range of representative pavement structures and analyzed more than 250,000 unique cases under simulated TSDD moving load in various temperatures. The researchers then used the database to study the temperature influence zones and develop temperature adjustment models for measured deflection slopes and deflections. Importantly, while the model development was independent of any particular TSDD device, the team evaluated the developed models with the collected field data from a TSD, due to its wide availability and adoption. However, the developed temperature adjustment models are generally applicable to any TSDD that collects midline deflection or slope data from dual tire loading while moving. Additionally, the researchers included an open-source script to automate the adjustment process for practical implementation.
• Format:
  PDF
• Funding:
  693JJ324D000006
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:7604260d78ac83b14bfa9cdab2eaf61f2c5719d0811a92f22a335a8f4bc0ccacb2a78b3afc6ef214cc257c49b8be8ba8ae0610a6697f419a3b5d5bc0d4f1d712
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/90149/dot_90149_DS1.pdf
• File Type:
  [PDF - 7.18 MB ]