Summers are often the peak time for concrete work. However, it also comes with extreme heat and problems like rapid drying, cracks and compromised integrity. Plus, it also reduces the lifespan of concrete and makes it weaker.
In this blog, created by our experts, you’ll get tips for pouring concrete in hot weather without facing challenges and a reliable place to get high-quality concrete suppliers in Wallan to help get the best concrete for your dream projects.
Why Does Hot Weather Challenge Concrete Pouring?
Concrete sets through a process called hydration every time. Water activates the cement particles in this key reaction. In hot weather, though, water evaporates much too fast. Therefore, the mix starves and cannot hydrate properly. This common issue causes shrinkage cracks that weaken surfaces.
High temperatures also speed up the entire setting process. You end up with very little time to spread and finish.
Best Time and Conditions for Pouring
Start early: It is best to pour before 10 AM. Also, keep air temps under 25°C.
Check forecasts: Skip windy days over 15 km/h and avoid low
humidity below 50%.
Monitor slab temps: Don’t forget to watch the slab temps. Use shade or ice to stay under 30°C.
Expert Tips For Pouring Concrete In Hot Weather
Time it right: Pour before 10 AM when temps stay under 25°C. Check forecasts to avoid wind greater than 15 km/h.
Prep smart: Shade the area with tarps or clothes. Soak the soil, forms, and tools 1-2 hours ahead.
Mix cool: Use chilled or iced water between 5-15°C and retarders like Sika for the best effect. Aim for 75-100 mm slump.
Pour fast: Team up, one mixes, others pour 2-3m sections wet-on-wet. Screed fast, bull float, then broom for grip.
Cure properly: Slap on wet hessian or plastic straight away. Mist every 2 hours for a full 7 days, or use curing spray.
Common Mistakes To Avoid
- Never overwater the mix during preparation or pouring. It creates weak and porous concrete easily.
- Block strong winds with simple plywood screens nearby. They prevent rapid surface drying.
- Wait until the wet sheen fully disappears before finishing. Patience pays off here.
- Install expansion joints every 2-3m deep at 5 mm. They control cracks effectively.
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Frequently Asked Questions
1. What temperature is too hot to pour concrete?
A temperature above 30°C is generally considered too high for pouring concrete. This high temperature causes faster water evaporation, leading to rapid setting and a significant reduction in structural strength. It is best to place your concrete between 10°C and 30°C for optimal results.
2. Can you pour concrete in hot weather above 35°C?
Yes, you can pour concrete above 35°C, but it requires some precautions to prevent it from drying too quickly, cracking, and compromising strength. Additionally, we suggest that, if possible, avoid pouring above 35°C.
3. What is the best time of day to pour a concrete slab in summer?
The best time of the day to pour a concrete slab in the summer is before sunrise and evening to prevent direct sunlight and heat. This time prevents rapid drying and protects the structural strength of the concrete.