5.4.2. Specific Gravity and Water Absorption (IS 2386 Part III)

Try these first

1. 1.

   What does specific gravity measure?

   Hint

   Think about how it compares to water.

2. 2.

   What is water absorption expressed as?

   Hint

   Remember how we measure the weight before absorbing water.

3. 3.

   What does specific gravity tell us about aggregates?

   • It indicates porosity
   • It indicates compressive strength
   • It indicates density

   Hint

   Consider how weight relates to volume.

4. 4.

   True or False: Water absorption directly affects the water-cement ratio.

   • True
   • False

   Hint

   Think about the role of aggregates in concrete.

5. 5.

   If an aggregate sample weighs 80 kg in air and 60 kg when submerged in water, calculate its specific gravity.

   Hint

   Use the formula for specific gravity involving the buoyant force.

6. 6.

   Discuss the implications of using aggregates with a water absorption of 5% in a concrete mix intended for high durability structures.

   Hint

   Consider the importance of maintaining a correct water-cement ratio.