Concrete gains strength gradually after pouring. Knowing the milestones tells you when you can remove forms, walk on it, and put it into full service.
| Time | Milestone |
|---|---|
| 24 – 48 hours | Initial set; forms can usually be removed |
| 3 days | About 40% strength; light foot traffic |
| 7 days | About 70% strength; vehicles on driveways |
| 28 days | Full design strength reached |
Keep it moist. Curing is a chemical reaction, not just drying. Keep new concrete damp for the first 7 days for maximum strength — let it dry too fast and it weakens and cracks.
Calculate your pour with the How Much Concrete Do I Need guide and How to Pour Concrete.