1. Initial Set (Walkable Surface):

• Time: 24 to 48 hours

• What happens: The concrete hardens enough to walk on it without causing damage.

2. Structural Strength (Curing):

• Time: 7 days (about 70% of full strength)

• What happens: The concrete gains most of its strength and can typically support framing and construction loads.

3. Full Cure (Design Strength):

• Time: 28 days

• What happens: Concrete reaches its full designed strength. This is the standard benchmark for structural readiness.

Additional Factors That Affect Drying/Curing:

• Temperature and humidity (warmer temps speed it up, cooler slows it down)

• Mix design (some mixes set faster/slower)

• Use of additives (e.g., accelerators or retarders)

• Moisture retention practices (curing blankets, spraying water)

🧱 Other Cost Factors:

• Thickness of slab (standard is 4–6 inches)

• Site prep (grading, excavation, demolition)

• Reinforcement (rebar or wire mesh)

• Access difficulty (tight spaces can increase labor)

• Permits & inspections (varies by location)

• Labor rates (higher in urban or high-cost areas)

✅ Types of Concrete Crack Repairs

1. Hairline Cracks (Cosmetic)

• Fix: Concrete filler, sealant, or resurfacer

• Tools: Caulk gun, trowel

• Cost: Low (DIY kits ~$10–$30)

2. Small Structural Cracks (1/8″ to 1/4″)

• Fix: Epoxy or polyurethane injection

• Purpose: Bonds concrete and stops water infiltration

• Used in: Walls, slabs, foundations

• Cost: $200–$800 (DIY or pro)

3. Large or Active Cracks

• Fix: Remove and replace section, add reinforcement, or install expansion joints

• May require: Underlying cause correction (e.g., settling, poor drainage)

• Cost: $500–$3,000+ depending on extent