Soil Classification (AASHTO and USCS)

More documents

Recommendations

Info

Group Index GI 200 200 [ ] GI = ( F − 35) 0.2 + 0.005( LL −40) + 0.01( F −15)( PI −10) (4.1) For Group A-2-6 <strong>and</strong> A-2-7 200 The first term is determined by the LL The second term is determined by the PI GI = 0.01( F −15)( PI −10) (4.2) use the second term only F200: percentage passing through the No.200 sieve In general, the rating for a pavement subgrade is inversely proportional to the group index, GI.
Some Explanations of Group Index GI 1, if Eq. 4.1 gives a negative value then GI=0; 2, round up the value calculated by Eq. 4.1 to an integer; 3, there is no upper limit for GI; 4, the GIs for soil groups A-1-a, A-1-b, A-2-4, A-2-5, <strong>and</strong> A-3 are always zero (0).
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: Note: Classification (Cont.) The fi
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 and 24: USCS System (cont.) • A typical U
Page 25 and 26: Classification of Soils • If the
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)

Create successful ePaper yourself

Delete template?

Save as template?