5.4. Symptoms and Effects

Try these first

1. 1.

   What does AAR stand for?

   Hint

   Think about the chemical reaction involving aggregates.

2. 2.

   Name a symptom of AAR.

   Hint

   This symptom often looks like a puzzle on the concrete surface.

3. 3.

   What is the primary cause of map cracking?

   • A) High temperatures
   • B) Alkali-silica reaction
   • C) Insufficient curing

   Hint

   Recall the chemical process we discussed.

4. 4.

   True or False: Efflorescence is a sign of AAR.

   • True
   • False

   Hint

   Think about moisture's role in both efflorescence and AAR.

5. 5.

   Analyze a situation in a coastal bridge that started showing efflorescence and map cracking within a few years. What might be the underlying causes, and what steps should be taken?

   Hint

   Consider environmental impacts and material choices.

6. 6.

   Propose a research study to assess the effectiveness of various pozzolanic materials in reducing AAR in concrete. Outline the methodology you would use.

   Hint

   Think about experimental designs and control measures.