Factors Affecting Creep of Hardened Concrete

Factors Affecting Creep of Hardened Concrete

1. Definition of Creep:

• Creep refers to the time-dependent deformation of hardened concrete under sustained load.

2. Factors Affecting Creep:

• Stress Level: Higher stress levels lead to higher creep.
• Concrete Mix Proportions:
  • Water-Cement Ratio: Higher ratios increase creep.
  • Aggregate: Type, size, and volume impact creep; larger and harder aggregates reduce it.
• Curing Conditions:
  • Properly cured concrete exhibits less creep.
• Age at Loading:
  • Older concrete demonstrates lower creep under the same load.
• Moisture Content:
  • Higher internal moisture increases creep.
• Temperature:
  • Elevated temperatures can accelerate creep.

3. Effects of Creep:

• Long-term deformations can lead to structural issues.
• Influences design, material selection, and construction methodology.

4. Mitigation Strategies:

• Optimize concrete mix (reduce water-cement ratio).
• Use high-quality aggregates.
• Ensure proper curing and moisture management.
• Allow sufficient time before loading for the concrete to gain strength.

These notes encapsulate the primary factors and considerations regarding the creep behavior in hardened concrete.