4.2. Mechanism of Action

Try these first

1. 1.

   What is the purpose of water reducers in concrete?

   Hint

   Think of how it helps with mixing.

2. 2.

   Name two types of accelerating admixtures.

   Hint

   One is typically avoided in reinforced concrete.

3. 3.

   What is the main advantage of using water reducers in concrete?

   • Decrease water satisfaction
   • Improve compressive strength
   • Reduce water demand

   Hint

   Remember how it affects the mix.

4. 4.

   True or False: Accelerators do not affect the strength gain of concrete.

   • True
   • False

   Hint

   Think about what accelerators do.

5. 5.

   Given that a concreting project in a hot climate requires a longer setting time, how would you justify the use of retarding admixtures?

   Hint

   Consider the temperature's effect on setting time.

6. 6.

   In a specific project, excessive use of a superplasticizer leads to reduced strength in concrete. Analyze this situation.

   Hint

   Think about too much of a good thing impacting results.