5.3. Mechanism of ASR

Try these first

1. 1.

   What is ASR?

   Hint

   Think about the interaction between alkalis and aggregates.

2. 2.

   What does hygroscopic mean?

   Hint

   Consider how a sponge works.

3. 3.

   What does ASR stand for?

   • A) Alkali-Silica Reaction
   • B) Acid-Silica Reaction
   • C) Alkali-Silly Reaction

   Hint

   Focus on the primary components involved.

4. 4.

   True or False: ASR can be mitigated by using non-reactive aggregates.

   • True
   • False

   Hint

   Consider the materials used in concrete.

5. 5.

   Analyze a concrete structure showing visible cracking. Discuss potential causes and recommend solutions to prevent ASR.

   Hint

   Consider both physical observations and chemical interactions.

6. 6.

   You are designing a concrete mix for a coastal highway. What steps will you take to ensure your mix resists ASR?

   Hint

   Think about both aggregate choice and chemical compositions.