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Specific Gravity of Soils






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Specific Gravity of Soils. Specific Gravity. This number indicates how much heavier/lighter a material is than water. In soils, SG refers to the mass of solid matter of a given soil sample as compared to an equal volume of water. Specific Gravity.
Specific Gravity of Soils

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Slide 1

Specific Gravity of Soils

Slide 2

Specific Gravity

  • This number indicates how much heavier/lighter a material is than water.

  • In soils, SG refers to the mass of solid matter of a given soil sample as compared to an equal volume of water.

Slide 3

Specific Gravity

  • For example: A material with SG of 2 is twice as heavy as water (2x 62.4 lbs/ft3 ) = 124.8 lbs/ft3

  • Equation Form: SG = Ms/VsΥwater

  • We use the SG of soils to calculate other engineering properties like the volume of solids in a sample….

  • This leads to the phase diagram (like last class) and…

    • S, n, e

Slide 4

Specific Gravity

Soil Solids Water

W = 187.2 lbs W= 62.4 lbs

SG= 187.2/62.4 = 3.0

1 ft3

1 ft3

Slide 5

General Ranges of SG For Soils

  • Sand 2.63 – 2.67

  • Silt 2.65-2.7

  • Clay & Silty Clay 2.67-2.9

  • Organic Soils <2.0

Slide 6

Procedures For Specific Gravity LabASTM D 854

See Chapter 3, Page 55 For Your Data Sheet

APPARATUS:

500 ml flask

Ice

Heating Plate

Thermometer C

Scale (readability .1g)

Evaporating Dish

Distilled Water

Slide 7

Procedures (Method B)

  • Dry specimens to constant mass in oven at 110 C.

  • Select a 500 ml flask and record mass (g)

  • Fill with distilled water to 500 ml line and record mass (g)

  • Record temperature of water in degrees Celsius (T1).

  • Pour 2/3 of water back into distilled container

Slide 8

  • Weigh out 100g of sandy soil and transfer to flask

  • Add distilled to 2/3 full and boil gently for 10 minutes

  • Bring temperature back to T1 using cooling bucket w/ice.

  • Add distilled to 500 ml line and record mass (g)

  • Record mass of evaporating dish (g)

  • Pour ALL sample into dish and dry to constant weight.

  • Record mass of oven dried dish/sample.

  • Complete calculations on data sheet, including correction for temperature …. SG is always reported at 20 C.

  • See page 44 for correction factors.


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