Note4-Index properties

Note4-Index properties - Topic III: Index Properties of...

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opic III: Index Properties of Soils Topic III: Index Properties of Soils Grain Size and Grain Size Distribution Particle Shape Relative Density (for sand) tterberg Limits (for clay) Atterberg Limits (for clay) Text: Sections 3.4 to 3.6
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Outline Grain Size and Grain Size Distribution Particle Shape Relative Density (for sand) Atterberg Limits (for clay)
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Major Soil Particle Groups ranular oils or Cohesive soils Granular soils or non-cohesive soils 4.75 USCS 0.075 300 75 4.75 ASTM 0.075 300 75 0.005 Coarse-grained Fine-grained soils soils
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Grain Size Distribution ignificance of GSD: • To know the relative proportions of different Significance of GSD: grain sizes. n important factor influencing the • An important factor influencing the geotechnical characteristics of a coarse grain il. soil. • Not important in fine grained soils.
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Grain Size Distribution Experiment Coarse-grained soils: Gravel Sand Fine-grained soils: Silt Clay 0.075 mm (USCS, ASCE) drometer ack of sieves hydrometer stack of sieves sieve shaker soil/water suspension Hydrometer analysis Sieve analysis
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Sieve Identification Opening Size (in) Opening Size (mm) 3 in 3.00 76.2 CG (Coarse Gravel) 2 in 2.00 50.8 1 1/2 1.50 38.1 1 1.00 25.4 3/4 0.75 19.0 3/8 0.375 9.52 FG (Fine Gravel) 4 .187 .75 #4 0.187 4.75 #8 0.929 2.36 CS #10 0.0787 2.00 16 0465 18 #16 0.0465 1.18 MS (Medium Sand) #20 0.0335 0.850 #30 0.0236 0.600 40 0167 425 #40 0.0167 0.425 #50 0.0118 0.300 FS (Fine Sand) #60 0.00984 0.250 100 00591 150 #100 0.00591 0.150 #140 0.00417 0.106 #200 0.00295 0.075 S & C
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Sieve analysis Analyst name: Test date: Sample description: 06B 001 Total sample mass M0 = 1553/1550 g ASTM Sieve Sieve opening Mass retained Mass Percent finer number (mm) (g) passing (g) by weight dm mp =Mp/M0 (%) 3/4" 19.05 548 84 100 1548.84 1/2 " 12.7 257.76 1291.08 83.36 4 4.750 534.79 756.29 48.83 10 2.000 301.51 454.78 29.36 20 0.850 188.68 266.10 17.18 30 0.600 53.72 212.38 13.71 50 0.300 65.24 147.14 9.50 0.150 45.79 101.35 6.54 200 0.075 41.60 59.75 3.86 Pan <0.075 59.75
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Hydrometer Analysis (D<0.0075mm) Stokes’ Law 22 1 8 18 sw s G vD D ρρ ρ == w ηη By measuring L and t, v = L / t ( ) 1 s w L D Gt η ρ = K
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Grain Size Distribution (Cont.) 100 D 10 = 0.013 mm; D 30 = 0.47 mm; D 60 = 7.4 mm 60 80 sieve hydrometer and ravels nes % ssing 20 40 30 sand gravels fines Pa 0 0.001 0.01 0.1 1 10 100 D30 Grain size (mm) Log scale can find % of gravels, sands, fines define D 10 , D 30 , D 60 .. as above.
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This note was uploaded on 12/29/2010 for the course CIVIL 3a03 taught by Professor Pguo during the Fall '10 term at McMaster University.

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Note4-Index properties - Topic III: Index Properties of...

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