Concrete curing is a time-dependent process, not an instant event. While concrete may achieve sufficient strength for certain operations relatively quickly, full curing takes much longer:
- Initial set: Typically 2-4 hours (depends on temperature and mix)
- Final set: Usually within 8-12 hours
- Early strength: Often reaches 70% of design strength in 7 days
- Design strength: Typically specified at 28 days
- Full cure: Continues to gain strength for months or even years
Proper curing—maintaining adequate moisture and temperature—is critical during the early days after placement. Most specifications require minimum curing periods of 7 days for normal concrete under favorable conditions.
