5.3. Timing and Supervision

Try these first

1. 1.

   What is slump loss?

   Hint

   Think about what happens to wet concrete after some time.

2. 2.

   What is the role of a supervisor in concrete placement?

   Hint

   Consider who needs to oversee many workers.

3. 3.

   What time frame should concrete ideally be placed after mixing?

   • 30-45 minutes
   • 15-20 minutes
   • 1 hour

   Hint

   Think about what's necessary for fresh concrete.

4. 4.

   Supervisors should monitor what conditions during concrete placement?

   • True
   • False

   Hint

   What keeps the concrete usable?

5. 5.

   A construction site experiences an unexpected delay in transportation, causing the concrete to sit for 50 minutes before placement. Describe the potential issues that might arise and the possible corrective actions.

   Hint

   Where does the time factor come in?

6. 6.

   During a site visit, a supervisor discovers the ambient temperature is above 35°C. What steps should they take to maintain concrete quality?

   Hint

   How does temperature play into concrete setting?