What term describes the tendency of concrete to deform under the influence of mechanical stresses?

• A. Creep
• B. Impact Load
• C. Dynamic Impact Load
• D. Blast Impact Load

Answer: (A)

Creep is the time-dependent deformation that occurs in concrete when a constant mechanical stress is applied. It happens because concrete has viscoelastic characteristics; the internal structure slowly rearranges and flows under sustained load, especially in the presence of moisture and varying temperature. This slow, ongoing deformation affects long-term deflections and stiffness, so it's a key consideration in designing for serviceability over the life of a structure. The other terms describe rapid or impulsive loading scenarios—impact, dynamic impact, or blast loads—that cause immediate or high-rate deformations rather than the gradual, time-dependent response seen with creep.