EM 1110-2-1100 (Part III)
31 July 03
Table III-1-2
Sediment Particle Sizes
1
2
3
ASTM (Unified) Classification
U.S. Std. Sieve
Size in mm
Phi Size
Wentworth Classification
Boulder
4096.
-12.0
1024.
-10.0
Boulder
12 in. (300 mm)
256.
-8.0
Large Cobble
Cobble
128.
-7.0
107.64
-6.75
Small Cobble
90.51
-6.5
3 in. (75 mm)
76.11
-6.25
64.00
-6.0
53.82
-5.75
Very Large Pebble
45.26
-5.5
Coarse Gravel
38.05
-5.25
32.00
-5.0
26.91
-4.75
Large Pebble
22.63
-4.5
3/4 in. (19 mm)
19.03
-4.25
16.00
-4.0
13.45
-3.75
Medium Pebble
11.31
-3.5
9.51
-3.25
Fine Gravel
2.5
8.00
-3.0
3
6.73
-2.75
Small Pebble
3.5
5.66
-2.5
4 (4.75 mm)
4.76
-2.25
5
4.00
-2.0
Coarse Sand
6
3.36
-1.75
Granule
7
2.83
-1.5
8
2.38
-1.25
10 (2.0 mm)
2.00
-1.0
12
1.68
-0.75
Very Coarse Sand
14
1.41
-0.5
16
1.19
-0.25
18
1.00
0.0
Medium Sand
20
0.84
0.25
Coarse Sand
25
0.71
0.5
30
0.59
0.75
35
0.50
1.0
40 (0.425 mm)
0.420
1.25
Medium Sand
45
0.354
1.5
50
0.297
1.75
60
0.250
2.0
70
0.210
2.25
Fine Sand
Fine Sand
80
0.177
2.5
100
0.149
2.75
120
0.125
3.0
140
0.105
3.25
Very Fine Sand
170
0.088
3.5
200 (0.075 mm)
0.074
3.75
230
0.0625
4.0
Fine-grained Soil:
270
0.0526
4.25
325
0.0442
4.5
Coarse Silt
Clay if PI $ 4 and plot of PI vs. LL is
400
0.0372
4.75
on or above "A" line and the presence
0.0312
5.0
of organic matter does not influence
Medium Silt
0.0156
6.0
LL.
Fine Silt
0.0078
7.0
Very Fine Silt
0.0039
8.0
Silt if PI < 4 and plot of PI vs. LL is
Coarse Clay
0.00195
9.0
below "A" line and the presence of
Medium Clay
0.00098
10.0
organic matter does not influence LL.
Fine Clay
0.00049
11.0
0.00024
12.0
(PI = plasticity limit; LL = liquid limit)
Colloids
0.00012
13.0
0.000061
14.0
1
ASTM Standard D 2487-92. This is the ASTM version of the Unified Soil Classification System. Both systems are similar (from
ASTM (1994)).
2
Note that British Standard, French, and German DIN mesh sizes and classifications are different.
3
Wentworth sizes (in mm) cited in Krumbein and Sloss (1963).
III-1-8
Coastal Sediment Properties
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