2.2. Specific Gravity (G)

Try these first

1. 1.

   Define void ratio.

   Hint

   What do you compare to the volume of voids?

2. 2.

   What is porosity expressed as?

   Hint

   Think about the total volume in relation to voids.

3. 3.

   What is the formula to calculate porosity?

   • n = V_voids / V_solids
   • n = V_voids / (V_voids + V_solids)
   • n = V_solids / V_voids

   Hint

   Remember, it's a ratio involving total volume.

4. 4.

   True or False: The value of specific gravity for most inorganic soils is generally less than 2.60.

   • True
   • False

   Hint

   Think about how specific weight varies in soil types.

5. 5.

   Given a soil sample with a bulk density of 1.8 g/cm³, determine the dry unit weight if the moisture content is 15%.

   Hint

   Remember to adjust for moisture content.

6. 6.

   A soil has a specific gravity of 2.75 and an air content of 25%. What would a saturated unit weight be if the bulk unit weight is 1.9 g/cm³?

   Hint

   Consider how saturation affects total weight.