Question

Creep of concrete under compression is defined as the 

• A. increase in the magnitude of strain under constant stress
• B. increase in the magnitude of stress under constant strain
• C. decrease in the magnitude of strain under constant stress
• D. decrease in the magnitude of stress under constant strain

Hint:

Remember: Creep is time-dependent and occurs due to sustained loads. It is an increase in strain under constant stress.

Answer 1

The Correct Option is A

Step 1: Understanding creep in concrete.
Creep is the gradual increase in strain (deformation) of a material over time when subjected to constant stress. In concrete, creep refers to the increase in strain that occurs when concrete is under a compressive load and the stress remains constant.

Step 2: Analyzing the options.
- (A) Correct. Creep is defined as an increase in strain under constant stress. As the material is subjected to continuous load over time, it deforms more, even though the stress does not increase.
- (B) Incorrect. Stress would not increase under constant strain. Creep refers to strain, not stress.
- (C) Incorrect. Creep is characterized by an increase in strain, not a decrease.
- (D) Incorrect. Creep refers to strain, and stress does not decrease under constant strain.
Thus, the correct answer is (A).
\[ \boxed{\text{Creep of concrete is the increase in strain under constant stress.}} \]