FIGURE 3

FIGURE 4

FILTER FABRIC IN PLACE

DRAINAGE TRENCH WITH FILTER FABRIC IN PLACE

10

The open-graded aggregate subbase would not support 1-x 2-x 10-in.
grade stakes. Consequently, it became necessary to check grades
of the subbase by stretching a stringline from the curb to an
equivalent height above the subgrade and measuring down to the top
of subbase elevation. This procedure left no permanent grade
stakes and required repeated stringlining and measuring. Field
records indicate that the subbase was placed in an 8 in. compacted
layer to the proper elevation. The thickness of the aggregate
treated base and aggregate subbase given in Table 8 indicate that
the subbase may not have been compacted to the proper elevation.
Also elevations taken on the pavement surface indicate variations
in the cross slope. Compaction was by 8 ton galion steel drum
rollers using two coverages while in the static mode.

FIGURE 5

PLACING AND LEVELING OPEN-GRADED AGGREGATE SUBBASE
12

FIGURE 6

H A U L I N G AND P L A C I N G OPEN-GRADED

AGGREGATE S U B B A S E

FIGURE 7

F I G URE 8

MOTOR GRADER A S S I S T I N G TRUCK OVER
OPEN-GRADED AGGREGATE B A S E COURSE

ASPHALT TREATED BASE COURSE SPREAD

15

FIGURE 9

MOTOR GRADER PLACING FIRST LIFT OF
OPEN-GRADED ASPHALT TREATED BASE COURSE

The second lift of asphalt treated base was placed by delivering
material into a windrow with bottom dump trucks and placing it by
use of a pickup machine and asphalt paver. Figure 10 is a
photograph of construction of the second lift of asphalt treated
base. Plant and placement temperatures for the second lift of
asphalt treated base are shown in Tables 3 and 4. The survey crew
painted grades on the first lift and the contractor placed the
second lift according to these grades.
This operation was satisfactory except that the paver occasionally
broke through the first lift of asphalt treated base at locations
that were thin from displacement of the subbase. In those cases,
the paver had to be assisted with a motor grader. This happened

FIGURE 10

PAVER PLACING SECOND LIFT OF OPEN-GRADED
SURFACE COURSE NEXT TO CURB AND GUTTER

F I G U R E 11

F I G U R E 12

PAVEMENT DEFORMATION AT S T A T I O N 1 0 7 RT

EXPOSED PAVEMENT LAYERS AT S T A T I O N 1 0 7 RT

25