TM 5-623
Table 6-2. Typical Layer Materials Properties
4. Subgrade:
1. Asphalt Concrete (Surface, Leveling, Base):
Unified classification ................. Liquid limit
Marshall stability (pounds)... Asphalt content (%)
CBR .......................................... Optimum moisture
Flow (0.01 inch) .................. Unit weight
control (%)
(pounds/cubic foot)
K-value (pounds/square inch) .... In-situ moisture content
Air voids (5) ........................ Asphalt penetration
1
(%)
(millimeters x 10 )
Plasticity index .......................... In-situ dry density (% of
optimum)
2. Portland Cement Concrete (PCC):
Modus of rupture (pounds/square inch)
(a) The volume of traffic for traffic type a was found
Compressive strength (pounds/square inch)
Entrained air (%) .................
on the traffic survey of September 1978 to be 2500.
Water/cement ratio (gallon/sack).
Looking down column a, table 6-3, that value (2000-
3999) was located. Looking horizontally to the far right
3. Base-Subbase Materials:
the column identified as "Volume Index" was reached at
k-value (pounds/square inch)
5. That value 5 was recorded on the form as the
CBR....................................
volume index for type a traffic for the survey date 9/78.
In-situ dry density (% of optimum).
(b) The volume of traffic for traffic type b was found
In-situ moisture content.......
on the traffic survey of September 1978 to be 85.
Looking down column b, table 6-3, that value (50-199)
was located. Looking horizontally to the far right the
Table 6-3. Traffic Volume Index for Roads
TRAFFIC TYPE
a
Passenger, panel and pickups.
b
Two-axle trucks and buses; also half-or full-track vehicles less than 20 kip, and fork lift trucks less than 5 kip.
c
Trucks with three or more axles. Also half- or full-track vehicles 20-40 kip, and forklift trucks 5-10 kip.
d
60-kip track vehicles and/or 15 kip forklifts. Number of operations per lane per day for tracked vehicles 40-60 kip
and/or forklift trucks 10-15 kip.
e
90 kip track vehicles and/or 20 kip forklifts.
f
120 kip track vehicles and/or 35 kip forklifts.
6-8
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