D 4.6 30
D_4.6_01_GB.fm 30-38
2.4 Problems during paving
Problem Cause:
Wavy surface
(”short waves”)
- change in the material temperature, demixing
- wrong material composition
- incorrect operation of the roller
- incorrectly prepared foundation
- long standstill times between loads
- grade control reference line is not suitable
- grade control jumps to the reference line
- grade control toggles between up and down
(inertia setting is too high)
- bottom plates of the screed are loose
- bottom plates of the screed are warped or not uniformly
worn
- screed does not work in the floating position
- too much play in the mechanical screed link/suspension
- paver finisher speed is too high
- augers are overloaded
- changing material pressure against the screed
Wavy surface
(”long waves”)
- change in the material temperature
- demixing
- roller has stopped on the hot material
- roller has turned or roller speed has been changed too fast
- incorrect operation of the roller
- incorrectly prepared foundation
- truck brake is applied too tight
- long standstill times between loads
- grade control reference line is not suitable
- incorrect installation of the grade control
- limit switch is not correctly set
- screed is empty
- screed has not been switched to the floating position
- too much play in the mechanical screed link
- auger is set too deep
- auger is overloaded
- changing material pressure against the screed
Cracks in the layer
(over the entire
width)
- material temperature is too low
- change in the material temperature
- moisture on the foundation
- demixing
- wrong material composition
- wrong layer height for the maximum grain size
- cold screed
- bottom plates of the screed are worn or warped
- paver finisher speed is too high
Cracks in the layer
(center strip)
- temperature of the material
- cold screed
- bottom plates are worn or warped
- wrong crowning
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