Soil Classification (AASHTO and USCS)

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Classification of Soils • From sieve analysis and the grain-size distribution curve determine the percent passing as the following: – > 3 inch – Cobble or Boulders – 3 inch - # 4 (76.2 – 4.75 mm) : Gravel – # 4 - # 200 (4.75 - 0.075 mm) : Sand – < # 200: Fines • First, Find % passing # 200 • If 5% or more of the soil passes the # 200 sieve, then conduct Atterberg Limits (LL & PL)
Classification of Soils • If the soil is fine-grained (≥ 50% passes #200) follow the guidelines for fine-grained soils • If the soil is coarse-grained (
Page 1 and 2: CE 240 Soil Mechanics & Foundations
Page 3 and 4: Objective Classifying soils into gr
Page 5 and 6: Soil particles The description of t
Page 7 and 8: Atterberg limits Atterberg limits a
Page 9 and 10: Definition of Grain Size No specifi
Page 11 and 12: Note: Classification (Cont.) The fi
Page 13 and 14: Some Explanations of Group Index GI
Page 15 and 16: General Guidance - 8 major groups:
Page 17 and 18: This is the example of Das, Example
Page 19 and 20: Unified Soil Classification System
Page 21 and 22: (Das, Table 4.2)
Page 23: USCS System (cont.) • A typical U
Page 27 and 28: Coarse-grained Soils
Page 29 and 30: Gravel 98-62 = 36% Sand 62-8 = 54%
Page 31 and 32: Example - Soil A (Cont.) • Soil A
Page 33 and 34: PI The Plasticity Chart L H LL (Hol
Page 35 and 36: Example Passing No.200 sieve 30 % P
Page 37 and 38: This is the Figure 4.7 of Das’ te
Page 39 and 40: Borderline Cases (Dual Symbols, con
Page 41: Reading Assignment: Das, Ch. 4 Home

Soil Classification (AASHTO and USCS)

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