When building a house in hot weather, concrete may face a higher risk of cracking.
The main reason is that high temperatures accelerate setting, while strong sunlight and wind increase surface moisture evaporation. Without proper construction control and timely curing, shrinkage cracking can become more likely.
If you are planning to pour concrete for slabs, roofs, terraces, or other structures this summer, remember these four points.
1. Avoid Extreme Heat, Direct Sunlight, and Strong Winds
Avoid pouring concrete during the hottest part of the day whenever possible.
Early morning, late afternoon, or cooler weather conditions are generally better choices. Slabs, roofs, and terraces are especially exposed to rapid moisture loss.
2. Check Formwork Temperature Before Pouring
Formwork exposed to the sun for a long time can become very hot, especially metal formwork.
Use appropriate shading or cooling measures when necessary, but make sure no standing water remains inside the formwork before pouring.
3. Do Not Add Water to Stiffened Concrete
In hot weather, concrete can become stiffer during transportation or delays.
Do not add water on site without proper approval. This may alter the original mix design and increase the risks of bleeding, segregation, reduced strength, and cracking.
If workability becomes a problem, contact the ready-mix supplier or qualified technical personnel.
4. Keep Pouring Continuous and Start Curing Promptly
Hot weather makes proper organization essential.
Prepare trucks, pumps, vibration equipment, workers, and curing materials before pouring begins to avoid long interruptions.
After finishing, start appropriate curing measures promptly to reduce rapid moisture loss from the concrete surface.
Conclusion
Summer is not unsuitable for concrete construction. The key is proper planning and timely curing.
Avoid extreme heat, never add water without authorization, maintain continuous pouring, and begin curing promptly. These four steps can help reduce the risk of summer concrete cracking.
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