There are many cracks in the concrete floor, what is the specific cause of it?

It is very likely that the quality of the cement is seriously poor, it may be because the temperature is relatively high, or it has been used for a long time, so cracks appear.

It may be that the quality of the cement floor is not very good, and some bad materials are used, and it may also be because it has been too long, so the cracks will appear.

This is because the masters are not rigorous enough when smoothing the cement, and when mixing the cement ash, it is not well integrated, so it will crack after drying.

1.In terms of materials: the cement grade is low or the cement is expired, which affects the strength and wear resistance of the ground; The sand particles are too fine, the water secretion of the mixture increases, and the mud content of the sand exceeds the standard, which affects the adhesion between cement and sand. The aggregate gradation is not good, so that the mixture produces segregation.

2.The dispatch (slump) of the mixture is too large: the water-cement ratio of the mixture is too large, resulting in coarse aggregate precipitation and mortar water leakage; At the same time, during the hardening process of mortar and concrete, excess water evaporates, forming a large number of capillaries, which reduces the mechanical strength of the ground.

If the water-cement ratio is too large, it will also delay the time of ground calendering, which will become a potential factor for ground sanding.

Method Step 1:

First of all, you need to make sure that the cement used is hot cement that has just been milled, because the cement that has just been ground has a large shrinkage when it sets and hardens.

Moreover, the mixed use of cement of different grades on the same floor will also cause surface cracks due to the different shrinkage amount during coagulation and hardening.

Method Step 2:

The thickness of the sand will also have a certain impact, the finer the sand and the larger the surface area, the amount of cement slurry adsorbed on the surface of the sand will increase accordingly, and the strength of the cement mortar will decrease under the condition that the amount of cement remains unchanged.

The excessive mud content in the sand causes the volume of the soil in the cement mortar to shrink during the hardening and dewatering process, resulting in cracking of the floor surface.

Method Step 3:

After the cement mortar is finally set, the hydration will continue, and in the season of high temperature and dry air, if it is not cured or cured in time, there will be dry shrinkage cracks in the cement surface layer.

Method Step 4:

If the soil quality of the backfill is poor or the ramming is not solid, the ground will produce uneven subsidence and cracks when the ground surface layer is completed.

In addition, when you are doing large-area cement mortar ground construction, the structure will be deformed without leaving construction joints, which will cause the ground surface layer to crack.

Pure cement floor cracks, the smaller reason is caused by the quality of the cement and the level of the master, and the more likely is that the cement floor cracks caused by the floor breaking and sinking are not solid when the ground is leveled.

1. It has a lot to do with cement. Because when the cement is solidified, a part of the water will evaporate, which will cause the ground to shrink and shrink the cracks, so the ratio of cement mortar back to the cavity is very important, and the cement with slightly higher strength must be selected, and at the same time, it is necessary to mix correctly according to the proportion.

2. There is also a great relationship with the construction process. If the ground is uneven, or there are cracks, and there are still dust and debris that have not been removed, it will affect the later cracks.

3. It is also directly related to the later maintenance. The later maintenance must not be missing. After the ground hardens, it also needs to be sprinkled with water to maintain, so as not to destroy the state of the surface leakage, and the wetting time should reach at least 1 week.

If there are cracks in the cement floor, you can observe the width of the cracks, if the width is between 2 mm, you can choose to use the injection method to repair, directly use AB resin repair glue, you need to clean the cracks, and then inject the glue directly into the cracks, so that you can repair the number of waiters. If the crack width is relatively wide, then the crack needs to be cleaned up, and then it can be repaired with cement mortar, and the surface should be smoothed, and the surface of the cement mortar should be maintained after drying, mainly to keep it moist, for better decoration later.

Is cement floor polished good?

Cement floor polishing is still very good, and the advantages of general cement floor polishing are still more, mainly the following points:

1. Cement floor polishing is more wear-resistant, and can improve compressive strength, in addition, it can also play an anti-weathering effect, and the cement floor can also be hardened after polishing.

2. If you want to throw potatoes, because the original material of the cement floor penetrant will have some precipitation after standing, it needs to be stirred evenly before using it after the bucket is finished. Then it is necessary to ensure that the ground is flat and clean, and then the cement floor is sanded with a grinder.

How to build a cement floor curing agent?

The construction method of cement floor curing agent is as follows: first clean the cement floor, if there are cracks and holes, you need to repair it first, then use a grinder to smooth it, then stir the curing agent, apply it to the ground, wait for it to dry thoroughly and then apply it twice, and finally you can clean the ground and grind it with a grinder to make the ground look more shiny and smooth.

There are many reasons for cracks in concrete floors, or they are more complicated. Among the main reasons: 1. The foundation is not done well.

If the foundation is not done well, there will be the problem of uneven settlement, which will lead to cracking of the concrete. 2. The expansion joint was not cut in time or the expansion joint was not cut at all. In this way, because the expansion joint is not cut in time, or the expansion joint is not cut, and the concrete shrinks, cracks will occur.

3. Cracking caused by untimely maintenance or improper maintenance. After the concrete is poured, there will be a process of solidification, this process needs to be cured, if there is no water in time, or the water is not sufficient in the solidification stage, the concrete will not be completely solidified, the label is not up to standard, and the cracking will be produced in serious cases.

The above are the three main aspects of concrete pavement cracking. The subject can find out the reason by comparison.

1. Remove the floating ash on the surface, carefully observe the severity of the sand on the cement floor in the house, and have different solutions according to the degree.

2. If the sand area of the cement floor is small and the floating sand is small, it is recommended to use pure cement slurry for local covering, and ordinary Portland cement or Portland cement can be used for cement.

3. If there is a lot of sand area on the cement floor but the situation is not very serious, it is recommended to use a professional ground treatment agent, the construction process is very simple and troublesome to deal with.

4. If the cement floor is sanded in a large area and is very serious, it is recommended to renovate it, remove the original surface layer, and re-lay the surface layer. The design of re-laying the surface layer is equivalent to reconstruction, and the precautions during the construction are the precautions we often call the prevention of sanding on the cement floor, which is very important to pay special attention to.

5. Treat with cement floor sand treatment agent, which is a product specially used to treat sanding, and it can be painted on the cement floor of sanding, but it can only be maintained for about five years.

6. Treat with Forcetek concrete sealing curing agent, Leadke LTK-8 concrete sealing curing agent can effectively penetrate into the cement concrete floor, and the living room reacts with the substances in the concrete to generate hard substances, fill the capillary pores in the concrete, improve the strength and wear resistance of the concrete floor, and solve the problem of sanding on the cement floor.

After the concrete construction is over, cracks will occur due to various reasons, and the cracks are of different degrees and scales, so what are the specific reasons for cracks in concrete? And how to deal with it? Today, I will tell you about some problems of cracks in concrete floors.

1. Causes of cracks in concrete floors.

1. It may be that some cracks are caused by temperature changes, and there are some differences between the temperature inside the concrete and the surface temperature, which will produce a large temperature difference. If there is thermal expansion and cold contraction, it will cause certain cracks.

2. It may be affected by external forces, and shrinkage and deformation produce cracks.

3. It is also possible that during construction, the quality does not meet the requirements, and the quality of the project is relatively poor, resulting in cracks. For example, in the process of construction, illegal operation or the ratio of concrete does not meet the requirements, without a certain amount of maintenance, cracks will appear on the concrete floor in the later stage.

4. Cracks caused by improper maintenance of concrete in the later stage. For example, the time of demoulding is too early or after the demoulding is improper, and the maintenance measures are not appropriate, so that the concrete is frozen or the surface loses water, and the situation of drying, which is affected by the external environment, which will make the concrete cracks.

5. Cracks occur under the action of external forces, such as some heavy objects on the concrete floor for a long time, or some large trucks passing by, and cracks will also occur on the ground for a long time.

Second, how to control.

1. During construction, the steel bar must be reasonably allocated, because the steel bar can effectively control the cracks of the concrete, and there is an anti-crack steel bar, which is arranged on the surface of the buried soil in front of the concrete, and the steel bar can not be too thick, and the spacing between them should be controlled, and it is not easy to crack in the later stage.

2. Control raw materials. There are different types of concrete according to the division of strength, for example, there are C20, as well as C30, C40, the greater the strength of concrete, the shrinkage will also increase, and the right raw materials need to be selected during construction.

3. The construction process should be controlled. Before construction, the concrete ground needs to be cleaned, the mortar or paint on it should be removed, and then it should be sprinkled with water to moisten, generally up to more than one day, and the construction is over to strengthen the maintenance, which can be covered with plastic film, and it needs to be cured for at least a week, and no one is allowed to destroy, so that the probability of cracks in the later stage will be greatly shortened.

The above points are about the causes of cracks in concrete floors and how we can control them.