UFC 3-260-02
30 June 2001
Table 3-4 (Concluded)
Percentage Finer
Unified Soil Classification Soil
Frost
Than 0.02 mm (0.04")
Group
Type Soil
by Weight
Types***
PFS*
(a) Gravels
1.5-3
GW, GP
Crushed Stone
Crushed rock
(b) Sands
3-10
SW, SP
S1
Gravelly soils
3-6
GW, GP, GW-GM, GP-GM
S2
Sandy soils
3-6
SW, SP, SW-SM, SP-SM
F1
Gravelly soils
6-10
GM, GW-GM, GP-GM
F2
(a) Gravelly soils
10-20
GM, GW-GM, GP-GM
(b) Sands
6-15
SM, SW-SM, SP-SM
over 20
GM, GC
F3
(a) Gravelly soils
over 15
SM, SC
(b) Sands, except very
fine silty sands
(c) Clays, PI 12
--
CL, CH
F4
(a) Gravelly soils
--
ML, MH
(b) Sands, except very
over 15
SM
fine silty sands
(c) Clays, PI 12
--
CL, CL-ML
(d) Verved clays and
--
CL, ML, SM and CH
other fine grained
banded sediments
* Nonfrost-susceptible.
** Possible frost-susceptible, but requires laboratory test to determine frost design soil classification.
*** Defined in AFM 89-3, Materials Testing.
3-8
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