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

Try these first

1. 1.

   What is specific gravity?

   Hint

   Think about how we compare the density of different materials to water.

2. 2.

   Name the two types of specific gravity for aggregates.

   Hint

   Consider which aspect of the aggregate each type measures.

3. 3.

   What does bulk specific gravity include in its measurement?

   • Only the solid material
   • Both solid material and its pores
   • Only the voids

   Hint

   Think about how this measure affects the concrete composition.

4. 4.

   True or False: Water absorption has no significant impact on the water-cement ratio.

   • True
   • False

   Hint

   Recall the importance of maintaining the correct water level in concrete mixes.

5. 5.

   A concrete mix is designed using aggregates with a bulk specific gravity of 2.5 and a water absorption rate of 3%. If the desired water-cement ratio is 0.5, how would the water addition change based on the absorption characteristics of these aggregates?

   Hint

   Consider how the water needed for absorption affects the mix design.

6. 6.

   You have two aggregates: one with a bulk specific gravity of 2.65 and water absorption of 1.5%, and another with a bulk specific gravity of 2.45 and water absorption of 4%. Which aggregate should be preferred for high-quality concrete and why?

   Hint

   Think about how the characteristics of each aggregate influence the final concrete performance.