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Pouring Concrete in Summer: Hot Weather Tips
How to pour concrete in hot weather. Tips for preventing rapid drying and ensuring proper curing in high temperatures.
Pouring concrete in hot weather (above 85°F or 29°C) requires special precautions to prevent rapid drying, cracking, and reduced strength.
Hot Weather Concreting Challenges
- Rapid evaporation can cause shrinkage cracks
- High temperatures accelerate curing, reducing long-term strength
- Heat makes concrete difficult to finish properly
- Sun exposure can cause surface drying before finishing is complete
Preparation Tips
- Schedule pours for early morning (5-7 AM) when temperatures are lowest
- Dampen the subgrade before pouring to prevent moisture absorption
- Use sunshades or tarps to protect fresh concrete from direct sunlight
- Have adequate crew - hot weather accelerates setting time
During the Pour
- Keep concrete temperature below 90°F during placement
- Use ice as part of mixing water to lower concrete temperature
- Work quickly but thoroughly - hot weather reduces workable time
- Have curing materials ready before the pour begins
- Use evaporative retarders or curing compounds
Curing in Hot Weather
- Begin curing immediately after finishing (within 30 minutes)
- Use wet burlap, curing blankets, or plastic sheets
- Keep concrete continuously moist for 7 days minimum
- Consider using curing compounds for large areas
- Monitor for surface cracking during curing period
Pro Tips
- Ideal concrete temperature for placement: 50-60°F
- Maximum concrete temperature: 90°F
- Add 2-3 inches to slab thickness in extreme heat
- Use Type III cement which resists heat better
- Limit pours to 50°F ambient or plan special precautions
Important Warnings
- Never add water to concrete to increase workability in heat
- Surface drying can occur in under 30 minutes in extreme heat
- Hot weather concreting requires experienced crews