models, screed extensions make it possible to pave
widths up to 24 feet in a single pass.
Cutoff Shoes. — Cutoff shoes (fig. 16-47) have the
opposite function of screed extensions. They are metal
plates inserted into the screed to reduce the width of the
mat being placed.
Bevel End Plates.— Bevel end plates (fig. 16-48)
are used to bevel the edge of the mat. On some models,
the shoes can be set at any one of three positions:
vertical, 30 degrees, or 45 degrees.
Tons Per Hour
The equation, used to compute the amount of
asphalt that can be layed with a paver per hour, is as
follows:
Figure 16-47.—Cutoff shoes.
16-42
Where
L =
W =
D =
146 =
60 =
2,000 =
Figure 16-48.-Bevel end plates.
Feet per minute. The NCF uses 11 feet per
minute for planning purposes.
Width of the paver screed
Depth or thickness of compacted mat
This number represents the approximate
weight of 1 cubic foot of compacted
hot-mix asphalt
60 minutes in 1 hour
There are 2,000 pounds in 1 ton
Example: The required tonnage of hot-mix asphalt
for a project is 800 tons. The screed of the paver is set
at 10 feet, and the depth of asphalt is 2 inches. Estimate
the amount of asphalt that can be laid per hour.
By planning and estimating the amount of hot-mix
asphalt that can be laid per hour, you are able to tell the
asphalt plant exactly how much hot-mix asphalt is
required to be delivered per hour or per day.
MAINTENANCE
As an Equipment Operator, it is your responsibility
to coordinate the proper operation, care, use, adjusting,
