Geology Reference
In-Depth Information
9. Grain-size analysis results are normally presented in graphical
form on semilogarithmic graph paper, with grain diameter along
the abscissa on a logarithmic scale that increases from right to left
and “percentage passing” along the ordinate on an arithmetic scale.
Such a graph is referred to as the
grain-size distribution curve
.
A laboratory test was conducted according to the procedure described
previously. The following data were obtained:
NUMERICAL
EXAMPLE
Mass
of
total
air
-
dried
soil
540.94
g
Mass of fraction retained on No. 10 sieve (washed and
oven-dried)
2.20 g
For sieve analysis of coarse aggregate:
Sieve Size
Mass Retained (g)
⁄
8
in.
3
0
No. 4
0.97
No. 10
1.23
For hygroscopic moisture correction factor:
Mass of container plus air-dried soil
109.57 g
Mass of container plus oven-dried soil
108.85 g
Mass of container
59.57 g
For sieve analysis of fine aggregate:
Mass of container plus air-dried soil for hydrometer
analysis
170.49 g
Mass of container
110.21 g
Sieve Size
Mass Retained (g)
No. 10
0
No. 40
5.13
No. 100
5.31
No. 200
5.19
For hydrometer analysis:
Hydrometer
Temperature,
Composite
Date
Time
Reading
(°C)
Correction
4/10
8:30
A
.
M
.
8:32
1.026
20°C
0.002
8:35
1.024
20°C
0.002
8:45
1.022
20°C
0.002
9:00
1.020
20°C
0.002
9:30
1.017
20°C
0.002
12:40
P
.
M
.
1.013
20°C
0.002
4/11
8:30
A
.
M
.
1.009
20°C
0.002
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