06
Oct
Pouring Concrete In Hot Weather Uk. Avoid pouring during the hottest part of the day often between noon and mid-afternoon. Try to avoid laying concrete at the hottest part of the day which is usually between 11am 3pm Using a concrete mix with a slower curing time can combat the curing problems caused by excessive heat Keep all equipment used to help lay the concrete cool and store in a shaded area where possible particularly metal tools. On a hot day you need to have access to drinking water at all times to avoid exhaustion during manual work. There will be occasions when the ready-mixed concrete supplier cannot guarantee this temperature on delivery and you will need to decide whether you can adequately protect the concrete in these circumstances if you wish to.
When pouring concrete in hot weather you must be prepared for some possible problems. The workmanship clauses are now in BS EN 13670 Execution of concrete rather than in the design code and follow the same requirement. Ensure you have enough manpower to handle the amount of concrete you have ordered. Changes in temperature of the concrete may also result in cracking particularly where. Also sunscreen should be applied before starting the pour. The temperature of concrete should not be less than 5ºC when delivered.
When pouring concrete in hot weather keep an evaporative retarder ready on site in case the temperature gets hotter and water is rapidly evaporating.
The workmanship clauses are now in BS EN 13670 Execution of concrete rather than in the design code and follow the same requirement. Concrete applications may be considered hot weather concrete at temperatures ranging from 77 to 95 degrees Fahrenheit depending on the specific application. If the concrete is warm and the sun is shining and there is a hot dry wind across the concrete yes you are likely to get more drying and surface shrinkage. Each 20F drop in concrete temperature will double the set time. Pouring Concrete on a Hot Day. In fact concrete cures best in a range between 70 to 80 F.