Infrastructure Management: PEDD Pavement Evaluation Technology for Roads and Airports

PEDD Pavement Evaluation Software for Roads and Airports: Timely infrastructure maintenance management requires nondestructive evaluation (NDE) for structural integrity assessment. This is explained in the following video interview of Dr. Waheed Uddin for road pavement assets (video credit: Omar Uddin, UVision).

FWD-Mvc-030v Falling Weight Deflectometer in operation

Pavement NDE software PEDD (Pavement Evaluation Based on Dynamic Deflections) is an enhanced user interface version of Dr. Uddin’s PEDD1 methodology that has been used for over 25 years in the U.S. and many countries. Peak deflection data from Falling Weight Deflectometer (FWD) and Dynaflect are analyzed for in situ material characterization and structural capacity analysis. The results are used for assessing structural strengthening needs and implementing pavement maintenance and rehabilitation interventions.

Dynaflect Nondestructive Deflection Testing
Falling Weight Deflectometer Deflection Testing of Pavements
PEDD for Windows NDE software (coding credit: Paul L. Venne, Jr., Northern Virginia)
PEDD for NDE evaluation of roads and heavy duty highway and airfield pavements

Variability in layer thickness of the top layer is a source of uncertainty in the modulus results using any backcalculation software. The PEDD program can accommodate thickness of top two layers easily for each test station in the input data file if these layer thickness data are available from ground penetrating radar (GPR) survey.

Dr. Uddin’s Notes: The results of PEDD methodology and verification have been published in my scholarly papers.

PEDD Modulus results verified by 3D-FE pavement model subjected to falling weight deflectometer impact load


PEDD’s in situ modulus results and nonlinear modulus values were verified in numerous studies, both with independent laboratory test results and simulation results from three dimensional-finite element (3D-FE) pavement modeling.
The animated video of the following FWD testing simulation example is for Kaneohe airfield in Hawaii.

4 thoughts on “Infrastructure Management: PEDD Pavement Evaluation Technology for Roads and Airports”

  1. This is very interesting. Have you looked at integrating elevation data into the program? Can you comment on the impact of all the use of mobile lidar scanners which are being used to not only map assets along the roadway, but the roadway surface itself?

    1. Hi, Bill: Thanks for this interesting comment.
      Nondestructive deflection testing is used to characterize in situ material properties of pavement layers and load carrying capacity.
      Other elements of pavement infrastructure condition monitoring include visual distress surveys and longitudinal roughness surveys.
      Pavement surface mapping by remote sensing methods can provide extent of surface irregularities and accurate maintenance work quantities to highway, airport, and public works agencies. Of course, this can be best accomplished by mobile LIDAR scanning equipment that you refer in your comment.
      I will be publishing more LIDAR related posts in June which will cover applications of LIDAR for terrain mapping (transport infrastructure engineering and flood risk apping), pavement asset surface mapping, and deforestation monitoring.
      Your expertise in mobile and airborne LIDAR mapping will be beneficial. I look forward to receiving more comments on these future posts.

    2. Federal funding will have very liltte impact on our construction activities in 2011. Grant funding has been reduced at all levels of government, so it’s essential local governments make the most of their limited resources. This is where having a qualitiy asset management system in place can help to prioritize infrastructure to maximize value. In Sarasota we’ve taken this step. The other issue is finding staff time to do the analysis within these systems to make the management system valuable. We knew we weren’t likely to have the time and resources to train personnel and have them do the thorough analysis needed. Instead, we took the dollars for a standard PMS and have invested them in a vendor / consultant to provide the reports necessary to prioritize paving for our 2011 program.

  2. 2011 will be an exciting year for our city. Federal and State buedgt cuts will impact every phase of our operations in one way or another. Smaller staff and less operating capital will require us to become more aware and innovative in our duties. Quality infrastructure management software will provide a crucial role in this atmosphere. Software manufactures who are able to produce efficient, streamlined, inexpensive software that actually works and has a short learning curve will thrive. Gone are the days of agencies with extra funds that needed to be spent and soon to follow are the software manufactures who deliver clunky, overly complicated programs which require a consultant to maintain. I predict more mobile capability with 2011 software along with a citizen reporting and feedback function.

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