Heavier types of asphalt cutback and tar maybe used in
that in-place aggregate may be used in an intermediate
the travel plant method, which reduces the time required
mix and placed with a finisher without the necessity of
The asphalt finisher may be used
loading and transporting aggregate. The finisher must
concurrently with the travel plant. The hopper of the
be used with the travel plant for construction of some
finisher is kept directly under the travel plant output
airfields when surface tolerances are critical.
chute. This arrangement reduces the maximum output
of the plant, although it does provide uniform thickness
of the mat being laid.
In blade mixing, the aggregate is dried and bladed
Windrows must contain no more material than the
into windrows (fig. 16-8). The windrows are then
finisher can place. The major advantage of this setup is
flattened and the bitumen of the specific temperature is
Figure 16-8.-Blade-mix construction.