Effect of Moisture on Typical Virginia Surface Treatment Materials

About the report:

Several aspects of the stripping and whip off characteristics of typical Virginia surface treatment materials were investigated. Sixty different binder-aggregate combinations were tested with the AASHO Designation T182-57 stripping test, a plate immersion stripping test, and a centrifuge whip off test, the last two of which were recently devised by the Virginia Highway Research Council. By statistically evaluating the results, it was concluded that: 1. The grade and source of asphalt and the type of aggregate cause significant differences in the stripping characteristics, 2. the whip off decreases with increased curing time, 3. there is no significant difference in performance between the crushed and uncrushed gravel, 4. the AASHO test has limited value in determining degrees of stripping, whereas the plate immersion test offers a valid method of numerically determining stripping differences between binder-aggregate combinations, 5. the AP-00 performs better than the emulsions, 6. the cationic emulsions perform better with carbonates than with silicates, 7. the limestone performs the best and uncrushed gravel the poorest with all asphalts, and 8. there is a slight interaction between asphalts and aggregates.

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