Topcon mmGPS 3D Paver, Reference Manual, Page: 171 / 288

Paver Components
P/N 7010-0781
4-9
which in turn affects mat thickness and therefore, mat smoothness
(Figure 4-12).
Figure 4-12. Reaction of Material Under Screed
Gradation Mix Characteristics
This aspect of the paving material varies according to the intended
use of the material as a base course, binder course, or the final
wearing surface. Normally, maximum aggregate size, ratio of
aggregates, fines content and most importantly, asphaltic binder
content, is specified by the contracting agency.
Adherence to mix design specifications is usually the responsibility
of the material supplier.
Segregation is a material deficiency caused by a separation of the
larger aggregate sizes from the bulk of the paving material.
This condition is encountered especially in mixes with relatively
large maximum size aggregate (example: 1" and larger, the so called
“large-particle” mixes). When paving material is deposited in piles,
as in an asphalt plant silo, a haul truck, a paver hopper, on the ground
in front of the paver in a windrow, or on the ground in the auger
chamber, segregation can and does frequently occur.
Reaction of Material
Under Screed
(Force "R")
R