Delamination between asphalt layers underneath the roadway pavement surface can lead to several types of problems, such as cracking in the wheel paths and tearing in the surface. Delamination is often due to layer debonding or stripping, which engineers can't see, especially in the early stages. Manual destructive methods for evaluating the pavement structure for problems can be time-consuming and expensive. New tools developed through SHRP2 allow transportation agencies to detect the location and severity of delamination before problems appear on the surface of the pavement. Advanced Methods to Identify Pavement Delamination (or R06D), includes three new technologies that can detect problems in the asphalt pavement beneath the surface in a safer, faster, and less expensive way than was done previously. Ultimately, the goal is to get real-time reliable results helpful for project-level forensics and network-level pavement assessment.
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Ground Penetrating Radar (GPR) uses an antenna array with a frequency sweep that can be operated at speeds over 60 miles per hour. The wide antenna array reduces the number of passes required to cover the lane width.
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Spectra Analysis of Surface Waves (SASW) and Impact Echo (IE) are two different technologies that together help identify the location of pavement delamination with automated test frequency every six inches in less than 1 percent of the time required by manual point testing.
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