Mixed clay engineering of aluminum formwork in winter construction

1, concrete winter construction should use Portland cement or ordinary portland cement, cement grade should not be lower than 32.5, the amount of cement should not be less than 300kg per cubic meter of concrete, water cement ratio should not be greater than 0.6, and with the early strength agent. When necessary, by adding antifreeze (determined according to temperature). 

2, in order to reduce frost damage, the water consumption in mixing ratio should be reduced to a minimum. The method is to control slump, add water reducing agent, and select superplasticizer.
 
3, the template and the insulation layer, the concrete should be cooled to 5 before it can be removed. When the temperature of concrete and the outside world is greater than 20 DEG C, the concrete surface after the removal, temporary coverage, the slow cooling.

4. The non cooled concrete has higher brittleness, so the structure can not be subjected to impact load or dynamic load before cooling.