An Evaluation of the Effectiveness of S-5 Scratch Courses
Report No: 77-R27
Published in 1976
About the report:
A study was made of the practice of "scratching" the surface course of several new construction projects in Virginia. It was found that sections with the surface course placed in one lift produced a road roughness value of about 3 in./mile higher than comparable sections which had the surface course split. Conversely, the single lift surface course sections had almost 2% average lower void contents than the scratched sections. It is concluded that the better riding quality cannot be justified economically when the decrease in durability caused by the lower density is considered.
- 77-R27
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Last updated: January 28, 2024
