You are here

Advancement of Profile-Based Curl and Warp Analysis Using Long-Term Pavement Performance (LTPP) Profile Data

Project Information

Project ID: 
Project Status: 
Start Date: 
Friday, May 9, 2014
End Date: 
Friday, November 10, 2017
FHWA Program: 
FHWA Topics: 
Roads and Bridges--Pavement and Materials
TRT Terms: 
Pavement Performance; Research; Smoothness; Infrastructure; Pavements; Curl and Warp
FHWA Discipline: 
Pavement and Materials
TRB Subject Area: 
Pavements, Research

Contact Information

First Name: 
Larry J
Last Name: 
(202) 493-3079
Email Address: 
Long-Term Infrastructure Performance Team
Office of Infrastructure Research and Development
Office Code: 

Project Details

Project Description: 

This project will expand the work presently limited to one project across a variety of Long-Term Pavement Performance (LTPP) test sections representing typical climates and regions of the United States. Ideally, relationships will be established that will allow more limited datasets to still predict the impact of curl and warp on overall pavement roughness measurements. While this is not guaranteed, it is certain that performing these analyses on a broader dataset will result in improved knowledge regarding the sections in question and additional data in the LTPP Pavement Performance Database (PPDB) that will support future research. In addition, and investigation of potential uses of Falling-Weight Deflectometer (FWD) data knowing the curl-and-warp properties of a pavement will be performed.


The project will expand the analysisto Long-Term Pavement Performance (LTPP) projects in different climates, to build models to predict curl and warp based on environmental and structural factors, and to examine the contribution of curl and warp to the structural response of the pavement system.

Partners and Other Sponsor/Managing/Performing Organizations: 


Deliverable Name: 
Final report and related material.
Deliverable Type: 
Research report or guidelines
Deliverable Description: 
The final report will provide the test sites and test sections under study; including the measurement dates, selected repeat measurements, and International Roughness Index (IRI) values. Also included will be the procedure for calculating pseudogradient (PSG) from profile; the method for measuring and/or estimating structural properties; the profile analysis algorithm for obtaining PSG for each slab; the method for aggregating PSG values within a test section; the justifications for the PSG algorithm and the procedures for estimating structural properties; the method for removing the contribution of curl and warp from the overall roughness values for study of long-term roughness progression; and roughness trends from all of the test sections analyzed in the study, including the portion of roughness caused by curl and warp.