Heritage Research Group conducted the following testing of VRAM under rumble strips. This study found that “test sections that contained VRAM demonstrated an increase in cracking resistance of the asphalt mixture.”
It concludes, “Using a VRAM to seal the centerline joint prior to the installation of rumble strips was effective in mitigating permeability concerns. Test sections that contained VRAM showed minimal to no permeability, and therefore durability of the longitudinal joint would be expected to improve.”
