10. Admixtures and Their Role in Fresh Concrete

Try these first

1. 1.

   What is an admixture in concrete?

   Hint

   Think about the purpose of enhancing concrete.

2. 2.

   Name one type of admixture that increases workability.

   Hint

   This type does not increase water in the mix.

3. 3.

   What is the primary role of plasticizers in concrete?

   • Increase water content
   • Improve workability
   • Speed up setting

   Hint

   Remember their specific function in mixes.

4. 4.

   True or False: Air-entraining agents are used to reduce shrinkage in a concrete mix.

   • True
   • False

   Hint

   Consider their main purpose.

5. 5.

   Compare and contrast the use of accelerators versus retarders in two different construction scenarios.

   Hint

   Think about weather conditions and their impacts on concrete.

6. 6.

   Evaluate the potential risks involved in using too much of any admixture in concrete mixtures and suggest mitigation measures.

   Hint

   Consider observing balance and adhering to specifications.