3.10. Alkali-Aggregate Reaction (AAR)

Try these first

1. 1.

   What does AAR stand for?

   Hint

   Think about the relationships between elements in concrete.

2. 2.

   Name one preventive measure for AAR.

   Hint

   Consider what can help reduce alkali content in concrete.

3. 3.

   What is the primary cause of Alkali-Aggregate Reaction (AAR)?

   • Presence of carbonates
   • Reactive silica and alkalis
   • Low water content

   Hint

   Remember what materials contribute to AAR.

4. 4.

   True or False: Alkali-Carbonate Reaction (ACR) is the most common form of AAR.

   • True
   • False

   Hint

   Think about the terminology we discussed.

5. 5.

   Consider a concrete structure that is exhibiting cracks. Propose a method for determining if these cracks are due to AAR. Discuss the steps you would take.

   Hint

   Think testing materials and assessing environmental conditions.

6. 6.

   If you are tasked with designing concrete for a new building in a region known for high alkali levels in its water supply, what steps would you take to mitigate AAR? Provide at least three strategies.

   Hint

   Remember the preventive measures discussed during class.