3.7.2. Absorption and Moisture Content

Try these first

1. 1.

   What is the definition of absorption in aggregates?

   Hint

   Think about how it affects concrete mix design.

2. 2.

   Name one moisture state of aggregates.

   Hint

   Recall the moisture content examples discussed.

3. 3.

   What state describes aggregates that are completely dry?

   • Bone dry
   • Saturated surface dry
   • Wet

   Hint

   Recall the different states discussed.

4. 4.

   True or False: Wet aggregates do not affect the water-cement ratio.

   • True
   • False

   Hint

   Consider why moisture is added through aggregates.

5. 5.

   Given an aggregate absorption of 5% and a total aggregate volume of 500 liters, calculate the amount of additional water needed for a concrete mix.

   Hint

   Consider the absorption rate and total volume.

6. 6.

   Discuss how using a saturated surface dry aggregate can improve concrete performance in a structural application.

   Hint

   Think about the hydration process and its role in concrete strength.