Geology Reference
In-Depth Information
corrected hydrometer reading, is 1.024 (as determined previously).
Substituting these values into Eq. (10-1) gives
a
100,000
2
.
70
2
.
70
1
P
1.024
1
63.9%
b1
2
59.65
Computations of
P
for the remaining hydrometer readings are done
in the same manner.
8. For the
8:32
A
.
M
.
time, the diameter of soil particle can be computed
using Eq. (10-3):
L
T
(10-3)
D
K
In this application,
K
is 0.01344 (from Table 10-3 for a temperature
of
20°C
and specific gravity of soil particles of
2.70
),
L
is 9.4 cm (from
Table 10-4 for an actual hydrometer reading of
1.026
), and
T
is 2
min (elapsed time from
8:30
A
.
M
.
to
8:32
A
.
M
.
). Substituting these
values into Eq. (10-3) gives
9.4
2
0.0291 mm
D
0.01344
Computations of
D
for the remaining hydrometer readings are done
in the same manner.
9. The grain-size distribution curve for the results of this test is plotted
in Figure 10-4. (At the end of the text, a blank copy of the required
graph paper is included for the reader's use.)
Figure 10-4
Grain-Size Distribution Curve
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