4.1.3. Water Addition Calculation

Try these first

1. 1.

   What is dry unit weight?

   Hint

   Think about what is left when we remove water from the soil sample.

2. 2.

   What does moisture content express?

   Hint

   Consider how to compare water and dry soil mass.

3. 3.

   What does dry unit weight specifically exclude?

   • Air
   • Water
   • Mineral Particles

   Hint

   Consider what remains when you take out water from soil.

4. 4.

   True or False: Moist unit weight increases as moisture content increases.

   • True
   • False

   Hint

   Think about adding water to a dry sample.

5. 5.

   Calculate the necessary water to add to a soil sample with dry unit weight 16 kN/m³, moisture content 10%, and saturated unit weight 20 kN/m³.

   Hint

   Don’t forget the formula connecting these weights.

6. 6.

   Given a soil with a porosity of 0.4 and bulk density of 1600 kg/m³, derive its specific gravity and void ratio.

   Hint

   Begin with understanding the relation of porosity to void ratio.