17.3. Constituents of Concrete for Pavements

Try these first

1. 1.

   What is the primary binding agent in concrete?

   Hint

   Think about what holds concrete together.

2. 2.

   Name one type of fine aggregate.

   Hint

   It’s often found in construction areas.

3. 3.

   What is the main purpose of using admixtures in concrete?

   • To increase strength
   • To modify properties
   • Both A and B

   Hint

   Think about why we might want to change concrete's behavior.

4. 4.

   True or False: Water used in concrete should have a pH below 6.

   • True
   • False

   Hint

   Remember the acceptable range for water.

5. 5.

   A contractor needs to prepare concrete for a pavement design involving 400 kg of cement with a required water-cement ratio of 0.5. Calculate the total amount of water needed.

   Hint

   Use the water-cement ratio formula.

6. 6.

   Discuss the effects of using contaminated water for mixing concrete and propose a method to ensure water quality.

   Hint

   Think about purification methods.