11. Moisture Corrections

Try these first

1. 1.

   What is free surface moisture?

   Hint

   Think about what happens when aggregates are exposed to water.

2. 2.

   How does absorption capacity affect water content?

   Hint

   Consider what absorbing water means for the aggregates.

3. 3.

   What is the effect of free surface moisture on the water-cement ratio?

   • It decreases the water content
   • It increases the effective water content
   • No effect

   Hint

   Think about what happens when unnecessary water is added.

4. 4.

   True or False: Absorption capacity of aggregates increases the amount of effective water available in a mix.

   • True
   • False

   Hint

   Why would absorbing water take it away from the mix?

5. 5.

   You have 800 kg of aggregates with 2% absorption. Calculate the reduced water content that needs to be adjusted in your mix.

   Hint

   Think about how absorption affects the total available water.

6. 6.

   If aggregates have 5% free surface moisture and your planned mix requires 200 kg of water, how much total water should you adjust for?

   Hint

   Remember, free surface moisture adds to our planned amounts.