4.5.2. Alkali-Aggregate Reaction (AAR)

Try these first

1. 1.

   What does AAR stand for?

   Hint

   Think about the components involved in cement.

2. 2.

   Name one type of silica that can react in AAR.

   Hint

   Consider what is commonly found in aggregates.

3. 3.

   What does AAR stand for?

   • Aggregate-Activation Reaction
   • Alkali-Aggregate Reaction
   • Alkaline-Activated Reaction

   Hint

   Consider the chemistry involved in cement.

4. 4.

   True or False: AAR only occurs in high-temperature environments.

   • True
   • False

   Hint

   Think about where moisture can be found.

5. 5.

   A construction project is underway using high-alkali cements and aggregates that have not been tested for reactivity. Discuss the potential long-term consequences.

   Hint

   Think about the damage AAR could cause over decades.

6. 6.

   Quantify the economic impact of using low-alkali cement versus traditional cement in a large construction project where AAR is a concern.

   Hint

   Consider both upfront and long-term costs.