Selecting Rehabilitation Options for Flexible Pavements: Guidelines for Field Investigations
Author(s):
T. Scullion
Publication Date:
January 2001
Abstract:
The first step in selecting the optimum rehabilitation strategy for a flexible pavement is identifying the cause of the existing pavement distress. The rehabilitation selection process is often straightforward once the cause has been identified. This report presents an updated summary of the techniques and interpretation guidelines that have been developed by the Texas Transportation Institute over the past two decades. A summary is presented of the different distress types frequently found on Texas flexible pavements. The possible causes for each are described together with guidelines on how to conduct a failure investigation. For each distress type a series of rehabilitation options are also presented.|In recent years nondestructive testing procedures have developed to a stage where they can provide critical inputs to this selection process. In particular the application of both Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR) technology has advanced to where they are now used by Texas Department of Transportation (TxDOT) Engineers as routine tools. In this report guidelines are presented on how TxDOT personnel can incorporate both GPR and FWD information into the evaluation process.|In addition, several districts are currently using full depth pavement reclamation techniques to strengthen low volume roadways. As part of this study, recommendations were also developed to provide the design engineer with new laboratory procedures for selecting the optimum stabilizer type and stabilizer content for reclamation projects.|The integrated nondestructive testing procedures and laboratory tools described in this report are beginning to be used on a regular basis by several TxDOT districts. They have also been incorporated into a pavement rehabilitation school which was developed as part of this project.
Report Number:
0-1712-4
Electronic Link(s):
Document/Product
http://tti.tamu.edu/documents/1712-4.pdf
Publication/Product Request
TTI reports and products are available for download at no charge. If an electronic version is not available and no instructions on how to obtain it are given, contact the TTI Library.