Concrete pouring in winter VS summer season

Temperature for pouring concrete in winter VS summer

Pouring concrete in summer or winter weather is no problem when you make sure the concrete temperature between between 40°F ~ 80°F. Because the concrete will make hydration reaction with water. If below 40°F ( the water will be freeze ) or over 80°F( the water evaporates quickly ), the water cannot deep into the concrete cement particles well. So the concrete hydrated will not be 100%.  After pouring, you need to do concrete pump maintenance at first. The concrete maintenance is also very important. Otherwise, it will face concrete repair and waterproof work in the long time. 


temperature for concrete pouring in summer vs in winter

Thus it is important to take the right steps and proper protection for keeping concrete temperature.


Concrete Pouring problem in hot temperature weather

Hot environment is not only including blazing weather, but also humidity and high wind included.


The hot temperature will lead to accelerated evaporation of water, so that the concrete hydration is not sufficient. After a long time, the concrete strength and hardness will be fail and cracks will appear in the concrete. It will increase the burden of concrete repair in the future.


concrete pouring in summer



Tips for Pouring Concrete in Hot Weather

In hot weather, the poured concrete has the phenomenon of accelerated cure gel speed and reduced strength. Thus, the pouring should be started at low temperature in the morning and night. The following measures should be taken in concrete mixing, transportation, pouring and maintenance.

Tips for Concrete Mixing in summer:

Add ice and cold water into mixing.

Increase the amount of fly ash, reduce the amount of cement, increase the particle size of aggregate and increase the slump if possible.

 

Tips for Transportation:

Cover the geotextiles and sunshades to prevent external heat.

 

Tips for Summer Pouring:

Oil stain and construction waste shall be removed from the pouring area, and vibrators and other working equipment shall be prepared in advance to ensure rapid and continuous pouring.

 

Tips for Concrete Maintenance in Summer:

After pouring, cover the shelter and spray water regularly to ensure the surface is wet until the end of curing time. If the surface is not wet, it is easy to crack. Also Show warning signs nearby.

 

 



Concrete Pouring problem in cold temperature weather

When the temperature is below 40°F, the concrete will set for a long time, the hydration of the concrete will basically stop, and the concrete strength will not increase.




Tips for Pouring Concrete in Cold Weather

In cold winter, if the concrete cannot be effectively hydrated, not only the concrete cannot be hardened and have good strength, but also affect project quality.


The concrete pouring shall be started when the temperature begins to rise in the morning. Avoiding freezing during the initial concrete set. The following measures can be considered in  mixing, transportation, pouring and maintenance to make sure concrete hydrated.


Tips for Concrete Mixing in winter:

Before mixing, ensure that the raw materials are free of frozen blocks, add antifreeze, and use cement with high hydration heat.


Tips for Transportation in winter:

Cover the insulation layer to reduce heat loss.


Tips for Concrete Pouring in Cold temperature:

Remove snow from frameworks, make sure concrete rapid and continuous pouring.

Add EPS board at frameworks till concrete cured.


Tips for Concrete Maintenance in Winter:

Cover with plastic film for insulation, also the cover can reduce the evaporation of concrete moisture.

Extend the frameworks removal time.




No mater in hot or cold weather, it is ok when you make plan and pour rapidly. Therefore the concrete will have crack and gap, and it will affect construction quality.