Who can talk about the causes of cracks in concrete floors?

Below the concrete floor is the base surface of concrete, and the flatness of the base surface determines whether the concrete slab can bear uniform force. When encountering heavy load, will the different thickness and bearing capacity of the plate lead to boundary fracture? 2. Cement problem.

Cement is the main component of concrete and the guarantee of concrete strength. If expired cement or unqualified cement products are used, the concrete floor is easy to crack and sand and dust will rise.

3. Aggregation problem.

Aggregates, mainly sand and gravel, need to be added to concrete, but there are many choices of aggregates, with different sizes and materials. If you choose fine sand and gravel (such as fine stone concrete for the surface layer), it is easy to sand and dust due to the increase of concrete shrinkage. In order to reduce the possibility of sand formation in concrete, clean materials with less active silica and continuous grading should be selected as far as possible.

4. Water cement ratio.

Concrete consists of water, cement, sand and stones. The general requirements are as follows

0.38: 1: 1. 1 1:2.72

. The proportions of solid, liquid and gas are 80% respectively.

18%, about 2%. 5. The influence of temperature.

Because concrete does not conduct heat and dissipate heat slowly, the internal temperature is still high when the temperature rises and falls, while the external temperature of concrete has been lost. When the concrete expands internally and contracts externally, the concrete floor will be deformed due to the temperature change, especially when a large area of concrete is not slotted according to the code (6X6).

6. Maintenance issues.

After concrete floor construction, there will be drying shrinkage reaction under the condition of water shortage, so to keep moisture, surface cracks can be prevented by sprinkling water or using concrete curing agent.