Experience of pouring fresh and sunny concrete without cracking

Experience pouring fresh sunshine concrete. When it is sunny, the concrete mixture evaporates very quickly. Rapid evaporation of water that cement has not yet hydrated will lead to cracking.

Causes of concrete cracking when sunny

  • Cause weather . When the ambient temperature is high, the cement in the concrete has not been hydrated yet, will cause the surface of the concrete structure to appear small cracks along the horizontal. This makes the waterproofing and bearing capacity of concrete components significantly reduced.
  • Construction causes : Construction workers have too high slump leading to the phenomenon of floating cement on the surface of concrete too much will cause concrete to crack the surface.

Construction workers want to make concrete components easily pump water onto concrete surface for easy face making. This makes the concrete mixture separated between the amount of cement and aggregate. Make the surface cracked.

Construction workers face too carefully. Thoroughly making the surface will cause the water and cement to split and float on the surface of the concrete mixture. It is easy to crack concrete.

Picture 1 of Experience of pouring fresh and sunny concrete without cracking
Thoroughly making the surface will cause the water and cement to split and float on the surface of the concrete mixture.

  • Cause of concrete. Concrete used without additives is also one of the causes of cracking of components. When concrete has additives, the amount of water to be added to the concrete mixture will be more. Makes the concrete mixture easily splitting water. concrete without additives, the concrete mixture cannot produce a thin film to help the concrete to self-maintain and avoid dehydration.

Experience of pouring concrete in the sun is not cracked

Pouring concrete when it is hot in the sun greatly affects the quality of the structure later. Should not really necessary, do not pour concrete when it is sunny.

Use plastic sheet when pouring concrete

After pouring concrete and finishing the surface, immediately apply a plastic layer on the surface of the component. This plastic layer will work to avoid dehydration of the surface of the component, so the surface of the structure will not crack. On the other hand, when covering this plastic layer, the concrete structure has an environment like that in a greenhouse. This helps the concrete grow faster and has very good quality.

This method can be used to produce precast concrete components. When the component is manufactured, it is immediately covered with a plastic layer and exposed to the sun. It will help the component quickly remove the mold and develop good strength. This helps reduce the cost of formwork and the cost of building a support tank.

Method to rub the concrete surface

When the concrete is finished and the surface is made once, while the concrete mixture begins to solidify (the surface is still soft), remove the face. Currently on the market there are many types of face beaters. And these face-beaters can be combined with a face-beating additive, which helps the concrete surface surface not only to be cracked and solid and smooth. This method is good for big projects.

For small houses, it is possible to use fly, rubbing and rubbing the face, while rubbing the face again, there may be a little more cement, which helps the concrete structure with a very beautiful surface.

In addition to the above methods, it is possible to combine with the method of controlling the slump and the construction process when pouring concrete.

How concrete surface cracks will affect concrete components

When the concrete surface is cracked, the bearing capacity of concrete components will be significantly reduced. These are also possible defects when the concrete components are put into operation will cause further cracking due to mechanical impact.

Reducing the waterproof ability of concrete. When concrete has poor water repellent ability, it will make reinforcement in concrete easily corrode by external environment. Because concrete is lost the ability to protect the reinforcement from the environment.

Remedies when pouring fresh sun-dried concrete surface

For components requiring permeability. These components are the only way to use bitumen and waterproof sheets, now there are many additives and companies working in this area, so you can rest assured.

For other components. With components that do not require waterproofing, a layer of cement water can be irrigated onto the surface of the structure. It is okay for those cracks to not affect the inner reinforcement.