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Hottest Part of the day
#ConstructionTips
Avoid the hottest part of the day to place and finish concrete and do not sprinkle water on the surface of slabs to facilitate finishing
When cement hydrates it sucks up water and grows crystals around the aggregate particles. When it's hot and that reaction is rapid, the crystals grow quickly but don't have time to grow strong. Early strength will be higher but 28-day strength suffers. If the concrete is about 18° hotter than normal (for example, 88° instead of 70°), the ultimate compressive strength will be about 10% lower.
Hottest Part of the day
#ConstructionTips
Avoid the hottest part of the day to place and finish concrete and do not sprinkle water on the surface of slabs to facilitate finishing
When cement hydrates it sucks up water and grows crystals around the aggregate particles. When it's hot and that reaction is rapid, the crystals grow quickly but don't have time to grow strong. Early strength will be higher but 28-day strength suffers. If the concrete is about 18° hotter than normal (for example, 88° instead of 70°), the ultimate compressive strength will be about 10% lower.