Page 276 - Geotechnical Engineering Soil and Foundation Principles and Practice

Soil Consistency and Engineering Classification
Soil Consistency and Engineering Classification 271

min. min. b min. of 12.12)
200) A-7 A-7-5 A-7-6 36 41 11 soils process Fig.

No. min. max. min. Clayey the by (see
passing A-6 36 40 11 found 30 minus

Materials 35% than A-5 min. 36 min. 41 max. 10 poor be will LL than

Silt-Clay (More A-4 min. 36 max. 40 max. 10 soils Silty to Fair group correct greater is

max. min. min. and subgroup
A-2-7 35 41 11 chart

max. max. min. sand above classification. A-7-6 of
A-2-6 35 40 11 and on
A-2 gravel right correct index

200) A-2-5 max. 35 min. 41 max. 10 to left the Plasticity

No. clayey or from is fit 30.
passing A-2-4 max. 35 max. 40 max. 10 Silty good proceed will data minus LL

less sand to available, test than
or min. max. Fine Excellent the less
(35% A-3 51 10 NP data which or
system Materials A-1-b max. max. sand test into left to equal

AASHTO A-1 passing: max. 50 max. 25 max. passing fragments, and required the from is subgroup

the Granular A-1-a 50 30 15 max. 6 Stone gravel With group
by percent fraction of procedure: first A-7-5 of
classification Classification index of rating The index

12.3 analysis, Characteristics limit types subgrade Classification elimination.
Table Soil General Classification Group Sieve 10 No. 40 No. 200 No. 40: No. Liquid Plasticity Usual significant constituent materials General as a b Plasticity

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