Geology Reference
In-Depth Information
The shrinkage ratio
R
can be computed using equation [1]:
M
o
V
o
ρ
w
R
(9-7)
A laboratory test was conducted according to the procedure described
previously. The following data were obtained:
NUMERICAL
EXAMPLE
Mass of dish coated with petroleum jelly,
M
T
11.30 g
Mass of dish coated with petroleum jelly plus wet
soil,
M
w
38.51 g
Mass of dish coated with petroleum jelly plus
oven-dried soil,
M
D
32.81 g
Volume of wet soil pat (same as volume of
shrinkage dish),
V
15.26 cm
3
Volume of oven-dried soil pat,
V
o
12.83 cm
3
The water content of the wet soil pat can be computed using Eqs. (9-3)
through (9-5).
M
M
w
M
T
(9-3)
M
38.51
11.30
27.21
g
M
o
M
D
M
T
(9-4)
M
o
32.81
11.30
21.51
g
a
M
M
o
M
o
w
100
(9-5)
b
a
27.21
21.51
21.51
w
100
26.5%
b
Equation (9-6) can then be used to compute the shrinkage limit:
c
1
V
V
o
2
ρ
w
SL
w
100
(9-6)
d
M
o
c
1
15.26
12.83
21
1.0
2
SL
26.5
100
15.2%
d
21.51
Finally, Eq. (9-7) can be used to find the shrinkage ratio:
M
o
V
o
ρ
w
R
(9-7)
21.51
12.83
1.0
R
1.68
These results, together with the initial data, are summarized in the
form on page 111. At the end of the chapter, two blank copies of this form
are included for the reader's use.
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