How a Screed Works
P/N 7010-0341 www.topconpositioning.com
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of the material in the mat have been interrupted, which
usually results in bumpiness and premature failure of the
pavement in those areas.
Segregation can also be the result of excessively worn
augers: “Center Streak” segregation can be caused by worn
“Kicker Paddles” at the center chain cause or near the
outside auger bearings. In fact center streak segregation is
frequently caused by incorrect arrangement of the auger
segments adjacent to the auger chain case. (Consult the
Manufacturers Manual).
“Center Streak” segregation is also caused by feeder gates
being set to tow. Adjust as necessary to provide sufficient
uniform material at the center of the paver.
NOTICE
NOTICE
“Center Streak” segregation can be limited and
even eliminated by slowing paving speed.
Mix Temperature Characteristics
A common paving problem is inconsistent temperatures in
the asphalt mix. As the material cools it loses its viscosity
making it more difficult to compact. If the resistance to
compaction increases, the screed will naturally increase its
angle of attack and begin to float up. This will change the
mat depth, resulting in bumps in the surface. If the mix and
or screed temperature are too low, the screed may no longer
slide smoothly over the material and a tearing of the mat
will occur.
Simple steps to take to control temperature variations:
1. Ensure that haul trucks take the shortest, most practical
route to the paver. Make certain that all trucks take the
same route to the paver.
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