18.7.1. Moisture Content Adjustment

Try these first

1. 1.

   What is free surface moisture?

   Hint

   Think about how surface water can change the mix.

2. 2.

   Why is measuring water absorption capacity important?

   Hint

   Consider the impact on mix strength.

3. 3.

   What does free surface moisture refer to?

   • Moisture in the air
   • Moisture on aggregate surfaces
   • Moisture in cement

   Hint

   Think about where water is found before mixing.

4. 4.

   True or False: Water absorption capacity of aggregates can influence the amount of water needed in concrete mixes.

   • True
   • False

   Hint

   How does water absorption impact actual water content?

5. 5.

   Given a concrete mix design calling for a 0.5 water-to-cement ratio, if your aggregates retain a moisture content of 3%, how should you adjust your mix?

   Hint

   Consider what it means for the final ratios.

6. 6.

   If concrete experienced significant cracking and spalling after a year, hypothesize how moisture adjustments could have prevented it.

   Hint

   Reflect on the relationship between moisture and strength over time.