7.9.B. Placement and Compaction

Try these first

1. 1.

   What is slump loss?

   Hint

   Think about changes in consistency over time.

2. 2.

   Why are agitator trucks used in transporting HPC?

   Hint

   Consider how they work to keep the mix consistent.

3. 3.

   Why is it critical to transport High Performance Concrete quickly after mixing?

   • To avoid setting prematurely.
   • To maintain workability and consistency.
   • To improve the curing process.

   Hint

   Consider how timing influences the final characteristics of concrete.

4. 4.

   True or False: Self-Compacting HPC requires mechanical vibration during placement.

   • True
   • False

   Hint

   Think about what makes SCC unique compared to conventional mixes.

5. 5.

   You are in charge of a construction site where HPC has been delayed. After mixing, it has been over an hour since the concrete was initially set to be placed. What steps would you take to still ensure the quality of the concrete?

   Hint

   Think about what happens to concrete as it sits.

6. 6.

   Design a curing method plan for a project scheduled in a hot weather environment. Include specific techniques and reasoning for choice.

   Hint

   Visualize how temperature affects curing and bond strength.