Paving Principles and Control Methods
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
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Paving Principles and Control Methods
This chapter describes the components of pavers and the basics in paving principles, as well as control methods
used for paving.
Paver Components
Modern pavers (Figure 10) consist of two major units: the Tractor and the Screed.
The primary function of the tractor is to propel the truck or paver feeding device, to convey and distribute the paving
material and to tow the screed. The function of the screed is to strike off the material in preparation for further
compaction. The screed is mounted to the tow arms at the screed pivot points and is attached to the paver at the
tow points.
Figure 10: Paver Components
How a Screed Works
The screed on all modern pavers is of the “floating, self leveling” type. As the paver tows the screed unit forward,
paving material flows under the screed. This causes the screed to float on the mat of material, thus establishing
mat thickness. Since the screed is mounted to the paver only at the tow points, the screed is completely free to float
up or down (Figure 11). The screed always seeks it's own “Planing Angle”, or angle of attack, dependent on the
combination of forces acting upon the screed.
Figure 11: Tow Point Path and Planning Angle
If the screed angle of attack is increased the screed rises, increasing the mat thickness (Figure 12).
If the angle of attack is decreased, the screed settles, providing a thinner mat surface (Figure 12).
Screed Pivot PointTow Point
Tow Point Path
creed Angle of Attack
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