TM
5-822-14/AFJMAN
32-1019
(a) Medium-curing liquid asphalt MC-250
(1) Open-graded aggregate.
(a) Rapid- and medium-curing liquid as-
and MC-800.
(b) Slow-curing liquid asphalts SC-250 and
phalts RC-250, RC-800, and MC-3000.
(b) Medium-setting asphalt emulsion MS-2
SC-800.
and CMS-2.
(2) Well-graded aggregate with little or no
SS-01h, CSS-1, and CSS-lh.
material passing the No. 200 sieve.
The simplest type of bituminous stabilization is
(a) Rapid and medium-curing liquid as-
the application of liquid asphalt to the surface of
phalts RC-250, RC-800, MC-250, and MC-800.
an unbound aggregate road. For this type of
(b) Slow-curing liquid asphalts SC-250 and
operation, the slow- and medium-curing liquid
SC-800.
asphalts SC-70, SC-250, MC-70, and MC-250 are
(c) Medium-setting and slow-setting asphalt
used.
c. Soil gradation. The recommended soil grada-
emulsions MS-2, CMS-2, SS-1, and CSS-1.
tions for subgrade materials and base or subbase
(3) Aggregate with a considerable percentage
of fine aggregate and material passing the No. 200
course materials are shown in tables 3-5 and 3-6,
sieve.
respectively.
Table 3-5. Recommended gradations for bituminousstabilized subgrade materials
Sieve Size
Percent Passing
3 in.
100
No. 4
50-100
No. 30
38-100
No. 200
2-30
Table 3-6. Recommended gradations for bituminous-stabilized base and subbase materials
1 in.
1-in.
-in.
-in.
Maximum
Sieve Size
Maximum
Maximum
Maximum
1-in.
100
-
-
-
l-in.
84
9
100
-
-
-in.
76
9
83
9
100
-
M-in.
66
9
73
9
82 9
100
3/8-in.
59
9
64
9
72 9
83 9
No. 4
45
9
48
9
54 9
62 9
No. 8
35
9
36
9
41 9
47 9
No. 16
27
9
28
9
32 9
36 9
No. 30
20
9
21
9
24 9
28 9
No. 50
14
7
16
7
17 7
20 7
No. 100
9
5
11
5
12 5
14 5
No. 200
52
52
5
2
52
d . Mix design. Guidance for the design of
c = percent of mineral aggregate passing No.
bituminous-stabilized base and subbase courses is
100 and retained on No. 200 sieve
d = percent of mineral aggregate passing No.
contained in TM 5-822-8/AFM 88-6, Chap. 9. For
subgrade stabilization, the following equation may
200
be used for estimating the preliminary quantity of
S = percent solvent
The preliminary quantity of emulsified asphalt to
cutback asphalt to be selected:
be used in stabilizing subgrades can be determined
0.02(a) + 0.07(b) + 0.15(c) + 0.20(d)
p=
100 (eq 3-2)
X
from table 3-7. The final design content of cutback
(100 - S)
or emulsified asphalt should be selected based
where
upon the results of the Marshal Stability test
p = percent cutback asphalt by weight of dry
procedure (MIL-STD 620A). The minimum Mar-
aggregate
shall Stability recommended for subgrades is 500
a = percent of mineral aggregate retained on
pounds. If a soil does not show increased stability
No. 50 sieve
when reasonable amounts of bituminous materials
b = percent of mineral aggregate passing No.
are added, the gradation of the soil should be
50 sieve and retained on No. 100 sieve
3-7
Previous Page
