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| NHDOT Research Center |
New Hampshire Department of Transportation Research Summary
Photographic Distress Surveys for Monitoring the Performance of Rehabilitated Pavements |
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| Project ID: |
93-11 |
| Researcher: |
New Hampshire Department of Transportation |
| Status: |
Completed |
| Details: |
The Department utilizes a variety of techniques for rehabilitating pavements including such treatments as overlaying, cold planing, hot and cold recycling, and the use of reclaimed stabilized base. In addition, materials such as reinforcing fabrics, crack fillers, stress-absorbing membrane interlayers, and rubber or polymer-modified asphalts have been used to reduce reflective cracking. To assess the effectiveness of these treatments, test sections were established at several locations. The need arose to develop a project-level survey procedure to accurately and efficiently quantify the recurrence of distress at each test location. Researchers evaluated three potential photographic distress survey methods to meet this need. These methods were identified as follows: Slide-Projection-Trace, Slide-Scan-Measure, and Electronic Camera-Measure. Of the three methods evaluated, the slide-projection-trace method allowed for the highest degree of accuracy when performing photographic distress surveys. This method produced high definition images that clearly identified the surface distress for tracing, which resulted in an accurate representation for measuring and classifying. The electronic camera-measure method was inhibited by limitations in the technology at the time of the evaluation. |
| Contact: |
For more information contact Alan Perkins at (603) 271-3151 |
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