Evaluation of flexible pavement performance using LTPP data.

Details

• Creators:
  Parker, Frazier ; Song, Jiansheng
• Corporate Creators:
  Highway Research Center
• Subject/TRT Terms:
  • Pavements
  • Pavement design
  • Evaluation
  • Pavement performance
  • Pavements, Flexible--United States--Testing
  • Pavements--Performance--United States
• Publication/ Report Number:
  930-419
• Resource Type:
  Tech Report
• Geographical Coverage:
  Alabama
• Corporate Publisher:
  Alabama. Department of Transportation
• Abstract:
  Pavements are complicated physical structures responding in a complex way to ; the influence of many variables. Understanding how the long-term performance of ; pavement: relates to the factors such as environmental and traffic loads is key to ; building and maintaining a cost-effectiv~ highway system. For this purpose, SHRPL ; TPP, a comprehensive20-year study, was designed to evaluate the performance of ; in-service pavemen~. ; , ' i J ; In this research, pavement performance related data available in DataPave3.0 ; were extracted and synthesized to cauy out a systematic study of the variables ; affecting performance of pavements., ; Firstly, GPS-land GPS-2 test sections from Alabama were analyzed to ; evaluate the performance predictive capability of the 1993 AASHTO flexible ; pavement design model. Research, showed that, statistically. speaking, the 1993 ; AASHTO flexible pavement design model provides biased prediction of the ; performance of flexible pavements with granular bases and unbiased prediction of ; the performance of pavements with bound bases when using subgrade resilient ; moduli from laboratory testin~. Research revealed serviceability degradation and ; subgrade resilient modulus are the key parameters for t~e 1993 AASHTO design ; model. ; Secondly, 48 SPS-I sections in Alabama, Arizona, Arkansas, and Iowa were ; used to evaluate the effects of specific design feature on pavement performance. ; Research revealed that fatigue cracking was a serious distress manifestation for pavements with granular bases. 44Full-depth" AC pavements performed better than ; other structural designs. Open graded drainable base layers improved the ; performance of pavements over fine-grained subgrades but pavements with dense ; graded black bases over coarse-grained subgrades performed better. ; Thirdly, 40 SPS-5 sections in Alabama,. Alberta, California, Miss~ssippi and ; Texas were chosen to evaluate strategies for rehabilitation of existing pavements. ; Research indicated that milling of existing pavement surfaces before overlay ; provided some benefits for thin overlay but no benefits for thick overlay. Virgin AC ; mixes performed consistently better than AC mixes with 30% RAP. Increased ; overlay thickness (thus total thickness) improved performance, especially in ; preventing fatigue and transverse cracking. ; Data in the SHRP-LTPP database provided a good platform for conducting this ; research. But, it has deficiencies such as incompleteness of certain data, and ; inconsistencies of some data elements which certainly diminishes confidence in the ; evaluations performed.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/5779/dot_5779_DS1.pdf
• File Type:
  [PDF - 3.75 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c250b70ff91a4968c993997e0c5913c9362e4f5e5f7260ed73550eaefac406b4