The following are the most common construction problems with potential solutions. It may take an investigative approach to determine the actual problem.
STREAKING OR DRILLING OF EMULSION:
Potential Solutions
Verify that the binder is at the correct application temperature
Ensure that the correct nozzle size is installed
Verify the nozzle angle is correct
Make sure all nozzles are clear
Verify triple overlap coverage
WASHBOARDING:
Potential Solutions
Reduce aggregate spreader speed. If the spreader’s forward travel speed is too fast, the spreader will begin to bounce or jump and the aggregate will fall out of the hopper. When this happens, the aggregate will be heavy for a few inches and then light for a few inches then heavy again. This cycle will continue repeating itself until the spreader speed is adjusted.
Follow correct patching procedures. Poor patching can also cause this problem.
Post-Construction Troubleshooting
The following are the most common post-construction problems with potential solutions. It may take an investigative approach to determine the actual problem.
LOSS OF AGGREGATE:
Potential Solutions
Increase the binder application rate
Removing the dust off the aggregate or switching to a cleaner aggregate
Verifying that the aggregate gradation meets specification and is consistent with the mix design results
Decrease the aggregate application rate to ensure it is not too heavy
Pre-treat all patches before binder application
Applying the treatment only when weather conditions are suitable
Ensure that the aggregate spreaders and rollers were operating closely behind the asphalt distributor
Control traffic speeds until emulsion is properly set
Ensure that brooming does not occur before the emulsion is properly set
BLEEDING OR FLUSHING:
Potential Solutions
Use a cubical shaped aggregate instead of a flat and elongated aggregate
Reduce the binder application rate
Increase the aggregate application rate
Verify that the distributor and aggregate spreader calibrations are correct