5. Alkali-Aggregate Reaction (AAR)

Try these first

1. 1.

   What does AAR stand for?

   Hint

   Recall the main acronym from the chapter.

2. 2.

   Name one type of AAR.

   Hint

   Think about the types discussed in the session.

3. 3.

   What is the main consequence of AAR in concrete structures?

   • Improved durability
   • Expansion and cracking
   • Reduced weight of concrete

   Hint

   Think about the symptoms and effects we discussed.

4. 4.

   True or False: ACR is the most common form of AAR.

   • True
   • False

   Hint

   Recall the definitions of the types we covered.

5. 5.

   A bridge built using reactive aggregates without preventive measures starts to exhibit cracks after two years. Recommend a solution to address and prevent further damage.

   Hint

   Think about long-term solutions discussed in the class.

6. 6.

   A structural engineer has observed efflorescence and map cracking on a newly constructed highway. Detail a step-by-step approach to diagnose whether it is due to AAR.

   Hint

   Remember the signs of AAR and testing methods we covered.