Bearcat BC-2016/CRC, Instruction Manual

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55
Gener
al Oper
ation
Rules of Thumb
Temperature
If your wearing a jacket, its too cold.
If the forecast is for 70 ° , that means it could possibly reach that
temperature if only for 5 minutes. Most chip seal designs require 2-4
hours of cure time at temperature.
Pay attention to over night forecast. Night time temperatures dropping
below 40 ° can cause failures with emulsions.
Use the ambient (outside air) temperature as a reference. Infrared
temperature guns are pretty good for diagnosing hydraulic problems and
paving, As for chip seal they make pretty good wheel chocks.
Spread Rate
Good chip seal final design starts with boots on the mat.
Look for complete single layer coverage of the aggregate. Next
determine that the aggregate is immersed in the asphalt about 50%.
Different road conditions may require a change in oil spread rate. Old
raveled pavement may cause the oil to fill tiny voids and reduce the
coverage on the aggregate. Likewise tight pavement may cause your chip
seal to bleed, so reduce the oil, not increase the aggregate. Aggregate
coverage should never vary much in this decision process. New asphalt
and fresh patches can suck up the oil like a sponge. It is a good practice
to fog seal theses areas prior to chipping. High temperatures in the
afternoon can cause bleeding with a design that was perfect in the
morning. If you cant reduce the asphalt spread rate, back the chipper off
a couple hundred feet.
Rolling
There are a lot of fancy rolling specs. Getting the first pass within about
3 minutes is most important. If you are sitting on fresh chip waiting for
dump trucks, Move!