4.5. Deterioration Mechanisms in Cement-Based Materials

Try these first

1. 1.

   What is sulfate attack?

   Hint

   Think about what happens to concrete when it interacts with sulfates.

2. 2.

   Name one preventive measure for AAR.

   Hint

   What type of aggregates might be combined with this?

3. 3.

   What is a major consequence of sulfate attack?

   • Reduction in strength
   • Expansion and cracking
   • Improved durability

   Hint

   Think about what happens to concrete when it swells.

4. 4.

   Is carbonation harmful to steel reinforcement in concrete?

   • True
   • False

   Hint

   Recall the chemical changes that impact the steel.

5. 5.

   Analyze a case where an old bridge is experiencing severe cracking. Discuss the potential deterioration mechanisms affecting it and recommend a course of action.

   Hint

   Consider the environmental exposure of the bridge as a major factor.

6. 6.

   Evaluate the long-term risks of using high-alkali cement in areas prone to high-reactive aggregates and suggest an alternative material choice.

   Hint

   Reflect on how cement composition directly affects its response to the aggregates used.