Condition: Discoloration caused by rainfall prior to curing of the slurry surfacing.
Figure 58 – Appearance Immediately After Rainfall
Figure 59 – Appearance Two Weeks Later
Possible Causes: Rainfall occurred before sufficient curing of the slurry surfacing.
Prevention: Routine observation of weather radar is an important first step in preventing rain on freshly applied slurry surfacing. Weather radar can be monitored from the project site or from a remote location.
Inspector’s Note: The extent of the damage experienced will determine the remedial efforts required
- Light rain may require a road closure until the slurry surfacing can support normal traffic before reopening.
- Moderate rain may wash the emulsified asphalt from the surface of the mixture. A road closure is required, and the slurry surfacing should be allowed to cure and dry. If loose aggregate is present, it should be swept prior to opening to traffic. After exposure to normal traffic, damage determined to be unacceptable should be corrected with a new application of slurry surfacing over the remaining material.
- Heavy rain may cause a major loss of emulsified asphalt. A road closure is required until loose material removal can be accomplished by sweeping. After exposure to normal traffic, damage determined to be unacceptable should be corrected with a new application of slurry surfacing over the remaining material.