Problem
1. What is the significance of elastic limit in structural design?
2. What is the difference between strength and toughness? Why is the 28-days compressive strength of concrete generally specified?
3. Discuss the significance of drying shrinkage, thermal shrinkage, and creep in concrete.
4. How would you define durability? In general, what concrete types are expected to show better long-time durability?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.