4.1.2. Minor Constituents in Cement

Try these first

1. 1.

   What is the maximum allowable percentage of magnesium oxide in cement?

   Hint

   Think about expansion.

2. 2.

   What does excessive sulfur trioxide in cement lead to?

   Hint

   Consider its effect on setting time.

3. 3.

   What is the maximum allowable percentage of magnesium oxide in cement?

   • 3%
   • 5%
   • 7%

   Hint

   Think about the impact on structural integrity.

4. 4.

   True or False: Excessive levels of sulfur trioxide can help in achieving sound cement.

   • True
   • False

   Hint

   Consider the role of setting times.

5. 5.

   Design a cement mix for a coastal structure that minimizes risks from alkali-silica reactions. Include your rationale for material choices.

   Hint

   Think of materials that resist absorption.

6. 6.

   Evaluate the long-term effects of using cement with excess SO₃ in harsh environments.

   Hint

   Consider the environmental conditions influencing cement performance.