Details:

Creators:
Williams, R. Chris ; Shaidur, R.
Williams, R. Chris ; Shaidur, R. Less -
Corporate Creators:
Iowa State University. Institute for Transportation
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Alligator Cracking Calibration Hot Mix Asphalt Longitudinal Cracking Overlays (Pavements) Pavement Design Pavement Distress Pavements--Cracking Pavements--Design And Construction Pavements--Maintenance And Repair Pavements--Overlays Rehabilitation (Maintenance) Rutting
Publication/ Report Number:
SPR 718
Resource Type:
Tech Report
Geographical Coverage:
Oregon
Edition:
Final report.
Corporate Publisher:
Oregon. Dept. of Transportation. Research Section
Abstract:
The Oregon Department of Transportation (ODOT) is in the process of implementing the recently introduced AASHTO

Mechanistic-Empirical Pavement Design Guide (MEPDG) for new pavement sections. The majority of pavement work

conducted by ODOT involves rehabilitation of existing pavements. Hot mix asphalt (HMA) overlays are preferred for both

flexible and rigid pavements. However, HMA overlays are susceptible to fatigue cracking (alligator and longitudinal

cracking), rutting, and thermal cracking. This study conducted work to calibrate the design process for rehabilitation of

existing pavement structures. Forty-four pavement sections throughout Oregon were included. A detailed comparison of

predictive and measured distresses was made using MEPDG software Darwin M-E (Version 1.1). It was found that Darwin

M-E predictive distresses did not accurately reflect measured distresses, calling for a local calibration of performance

prediction models. Darwin M-E over predicted total rutting compared to the measured total rutting and most of the rutting

predicted by Darwin M-E occurs in the subgrade. For alligator (bottom-up) and thermal cracking, Darwin M-E

underestimated the amount of cracking considerably as compared to in-field measurements. A high amount of variability

between predicted and measured values was observed for longitudinal (top-down) cracking. The performance (punch-out)

model was also assessed for continuously reinforced concrete pavement (CRCP) using Darwin M-E's default (nationally

calibrated) coefficients.

Four distress prediction models (rutting, alligator, longitudinal, and thermal cracking) of the HMA overlays were calibrated

for Oregon conditions. It was found that the locally calibrated models for rutting, alligator, and longitudinal cracking

provided better predictions with lower bias and standard error than the nationally (default) calibrated models. However,

there was a high degree of variability between the predicted and measured distresses, especially for longitudinal and

transverse cracking, even after the calibration. It is believed that there is a significant lack-of-fit modeling error for the

occurrence of longitudinal cracks. The Darwin M-E calibrated models of rutting and alligator cracking can be implemented,

however, it is recommended that additional sites be established and included in the future calibration efforts to improve the

accuracy of the prediction models.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:69910ab5345ea9ae7ef2bb736cef77beebc7e27cb0121544744c0f84ff0e4cef
Download URL:
https://rosap.ntl.bts.gov/view/dot/25790/dot_25790_DS1.pdf
File Type:

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