Soil Particle Size Chapter 2.11 Soil Particle Size 3" No. 4 - - PDF document

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Soil Particle Size Chapter 2.11 Soil Particle Size 3" No. 4 - - PDF document

Aug 02, 2023 308 likes •383 views

1/24/2015 Soil Particle Size Chapter 2.11 Soil Particle Size 3" No. 4 No. 200 USCS gravel sand fines (silt and clay sizes) AASHTO gravel sand silt clay USDA gravel sand silt clay MIT gravel sand silt clay 0.6 60

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SLIDE 1

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Soil Particle Size

Chapter 2.11

Soil Particle Size

60 0.6 gravel sand silt clay gravel sand silt clay gravel sand silt clay gravel sand fines (silt and clay sizes) MIT USDA AASHTO USCS 3"

  • No. 200
  • No. 4

Grain size (mm)

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SLIDE 2

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Clay Mineralogy

Chapter 2.12

Products of Weathering

Granite Coarse-grained Na-Feldspar

Na(AlSi3O8)

K-Feldspar

K(AlSi3O8)

Quartz

SiO2

Basalt Fine-grained Ca-Feldspar

Ca(Al2Si2O8)

Na-Feldspar

Na(AlSi3O8)

Olivine

(Mg,Fe)2SiO4 Easily Weathered Minerals

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SLIDE 3

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Products of Weathering

Silica Tetrahedron

Holtz & Kovacs, 1981

(Si2O10)-4

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SLIDE 4

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Aluminum Octahedron

Holtz & Kovacs, 1981

Al3(OH)6 Mg3(OH)6

Gibbsite Brucite

Kaolinite

Specific surface = 15 m2/g

hydrogen bonding

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SLIDE 5

1/24/2015 5 Montmorillonite

nH2O layers and exchangeable cations 0.96 nm

Specific surface = 800 m2/g

Illite

0.96 nm

Specific surface = 80 m2/g

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SLIDE 6

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Mitchell, 1993

(Montmorillonite)

Clay Water