Condition: Slurry surfacing is spilled or tracked onto concrete gutters and valleys.
Figure 60 – Poor Workmanship Resulting in Slurry Surfacing on Gutter/Driveway
Figure 61 – Mix on Curb/Driveway
Possible Causes: Slurry surfacing system treatments containing an excessive amount of liquids tend to have unacceptable consistency that makes achieving a clean, crisp edge line along the concrete gutter difficult. Line drivers that have difficulties following the edge line or curb line contribute to this problem. Application equipment leaving the project with emulsified asphalt or mix on their tires can leave tracks across concrete gutters or valleys.
Prevention: Accurate equipment calibration, adherence to the JMF and maintaining the proper mix consistency will eliminate/minimize slurry surfacing mixture on concrete gutters and valleys. When applying slurry surfacing adjacent to a concrete gutter or valley, a skillful driver can simplify the operator’s task by moving the spreader box laterally as required. When accompanied with proper spreader box set up and a stable homogeneous mixture, it can produce results such as those seen in Figure 62.
Figure 62 – Successful Results from Adherence to Best Practices
Inspector’s Note: Slurry surfacing mixture spilled or tracked onto concrete should receive prompt attention. The contractor should remove excess material from the concrete. Dusting with cement or making a fine cement slurry mix and brushing it on the affected area can be effective for small areas. In extreme cases, power washing may be necessary.