4.10. Admixtures in Special Concretes

Try these first

1. 1.

   What is the purpose of using high-range water reducers in SCC?

   Hint

   Think about how SCC is designed to behave.

2. 2.

   Name one type of admixture used in HPC.

   Hint

   Recall the additives that increase performance.

3. 3.

   What is a primary reason for using accelerators in shotcrete?

   • To increase working time
   • To achieve fast setting
   • To improve pumpability

   Hint

   Think about the application speed needed in shotcrete.

4. 4.

   True or False: High-Performance Concrete utilizes only traditional additives.

   • True
   • False

   Hint

   Consider the advancements in concrete technology.

5. 5.

   Develop a complete design specification for a project using high-performance concrete in a marine environment, including admixture selection and their functions.

   Hint

   Consider the harsh conditions and required performance attributes.

6. 6.

   Evaluate the effects of using air-entraining agents in mass concrete applications during hot weather.

   Hint

   Think about why balance in temperatures is crucial for mass concrete.