Before writing a specification for your slurry seal project, review the Recommended Performance Guideline for Emulsified Asphalt Slurry Seal (A105) provided by the International Slurry Surfacing Association (ISSA). This resource will help in design, testing, quality control, measurement and payment procedures for your project.
Note: It is important to keep in mind that ISSA includes recommended guidelines, not specifications. There are many important factors to consider after reviewing the A105, and your project may demand different processes and measurements from the included guidelines.
Use ISSA A105 and the following statements to inform decisions and provide support when writing a final specification for your slurry seal treatment:
Screen the material immediately prior to loading the truck mounted paver or mobile support unit. This way, there is no possibility of contamination when re-handling the material.
Require a recalibration when material changes, conveyor seals, and/or emulsion pumps have been replaced.
Require the contractor to perform a calibration with the inspector on site, with the specific materials for the job. This step has a high potential for increasing the quality of the job.
The agency can provide early notification by website, newspapers, signs and/or door hangers. The contractor can notify by signs and/or door hangers the day before and the day of the application.
Speak with nearby agencies and local contractors to determine the normal practice in the area. Note that quality can be achieved on good asphalt surfaces either way, but the mix design must be prepared knowing if the pavement will receive a tack coat.
Ensure crack sealing material is not excessive, as it can be picked up by the slurry seal paver tires and spreader box runners.
To increase the longevity of the slurry seal, roll parking lots, cul-de-sacs, and other pavements that will not receive regular traffic.