What is the cause of transverse uniform cracks in concrete walls after demoulding?

The cause --- excessive retardation, shrinkage caused by excessive volume of concrete slurry--- excessive retardation leads to low early strength, unable to resist shrinkage stress--- and the thickness of the protective layer is not enough, so it cracks along the steel bar.

No compromise on quality.

One is that there is no timely watering and maintenance, and the other is that the concrete protective layer is small because you are a uniform 20cm transverse crack, which is related to the steel bar spacing of the wall. I think the second option is more likely.

Generally, the cracking of the mortar will not appear again after your repair, then it should be the cracking of the masonry, since you don't see it, the crack is very small, or the crack is not clear at the ash joint, because the strength of the masonry mortar is very low, it will not crack in the brick, and the ash crack You see on the surface of the mortar is an oblique line. The unevenness of the wall will be caused, you say that it is not the uneven settlement of the foundation is also unreasonable, the masonry structure will always have cracks in the weak side, the corners of the wall or the concrete parts will not appear, those places have through cracks, the house is dangerous, if the foundation of your house is weak, lateral displacement is likely to appear such cracks, there is a house itself weight eccentric tension. There is also the surface layer of the mortar is generally higher than the strength of the bottom mortar, so the sentence of hard work is not right.

But maintenance is still important. You should have a comprehensive understanding of the structure and construction process of your house, so you need to think about the possible reasons, my advice to you, first of all, you have to observe the development of cracks, if the cracks do not continue to develop, the house does not appear other through cracks, or large cracks that transmit light, then you should not worry too much, cement has its ability to heal itself, and it may not be seen after a long time. The observation method is very simple, you can use two pieces of paper to buckle together, mark the red paint, and the cracks will be clearly visible.

Summary. 1. The structural problems of concrete cause local inability to be evenly stressed; 2. The later stage is not reasonably maintained, resulting in surface cracks; 3. The formwork is dismantled too early, and the concrete has not yet condensed; 4. There is a problem with the proportion of concrete blending, and the strength is not enough; 5. The amount of cement used is too much, and the maintenance is not properly controlled.

1. The structural problems of concrete cause local inability to be evenly stressed; 2. In the later stage, the socks are not properly maintained, resulting in surface cracks; 3. The formwork is dismantled too early, and the concrete has not yet condensed; 4. There is a problem with the proportion of concrete blending, and the strength is not enough; 5. The amount of cement used is too noisy, and the maintenance is not properly controlled. Leak good waiter.

1. Change the water-cement ratio without authorization during the construction process.

2. The transportation time of concrete mixing is too long.

3. The formwork operation is not standardized, 4. The construction process is unreasonable and the management is chaotic.

Summary. Hello dear, 1. Cracking, which may be related to insufficient maintenance, such as after pouring concrete, the surface has not had time to cover, and it has been exposed to wind and sun, and the moisture on the surface has shrunk rapidly, reducing the strength. Unable to resist this stress, cracking occurs.

2. There are also some cracks in the concrete that have been formed, but are affected by the temperature, mainly because of the cracks in the surface temperature, and the cracks caused by the large temperature. This kind of crack is called a temperature difference crack, and generally speaking, there is no law on its direction, some are relatively large, and some are relatively small. 3. Cracks in concrete may also be caused by uneven settlement, mainly because of the settlement of the foundation, resulting in the foundation beam, including the ring beam, etc., which is too large, resulting in cracks.

4. Cracks may also be related to inadequate construction, such as pouring too fast and low fluidity. In addition, if the vibration is not timely, tight and uneven in the later stage, there will be honeycomb or hemp surface.

If the concrete wall is poured down, there will be cracks in the cement mold, and the cracks will be a line to the end.

5 meters high, 60 cm wide concrete or scramble wall. C35 concrete, the cement that fell on the first day of the spring group, there were cracks in the second day of the mold removal and a line cracked to the end, there were many cracks.

Hello dear, 1. Cracking, may be related to the lack of maintenance, such as pouring concrete after the answer, the surface has not had time to cover, exposed to the wind and sun, the moisture on the surface shrinks rapidly, reducing the strength. Unable to resist this stress, cracking occurs. 2. There are also some cracks in the concrete that have been formed, but are affected by the temperature, mainly because of the cracks in the surface temperature, and the cracks caused by the large temperature.

This kind of crack is called a temperature difference crack, and generally speaking, there is no law on its direction, some are relatively large, and some are relatively small. 3. Cracks in concrete may also be caused by uneven settlement, mainly because of the settlement of the foundation, resulting in too large foundation beams, including ring beams, etc., resulting in cracks. 4. Cracks may also be related to inadequate construction, such as pouring too fast and low fluidity.

In addition, if the vibration in the later stage is not timely, tight, and not evenly lifted, there will be honeycomb or hemp surface.

The main thing is that the cracks are too standardized, and a line is 5 meters high at the end.

It doesn't feel like a matter of maintenance.

2. There are also some cracks in the concrete that have been formed, but are affected by the temperature, mainly because of the cracks in the surface temperature, and the cracks caused by the large temperature. This kind of crack is called a temperature difference crack, and generally speaking, there is no law on its direction, some are relatively large, and some are smaller than the wandering waste. 3. Cracks in concrete may also be caused by uneven settlement, mainly because of the settlement of the foundation, resulting in excessive size of the foundation beams, including ring beams, etc., resulting in cracks.

4. Cracks may also be related to inadequate construction, such as pouring too fast and low fluidity. In addition, if the later stage of the discussion is not timely, tight, and uneven, there will be honeycomb or hemp surface.

Summary. There are many causes of cracks.

1. The aggregate contains sediment.

2. Cement is high hydration heat cement.

3. The temperature difference between the inside and outside of concrete is too large.

4. The vibration is not standardized.

5. Failure to maintain in time.

After the concrete column was removed, obvious cracks were found.

There are many reasons for the cracks in the chain. 1. The aggregate contains sediment. 2. Cement is high hydration heat cement. 3. The temperature difference between the inside and outside of the rough concrete is too large. 4. The vibration is not standardized. 5. Failure to maintain in time.

Does such a crack affect the strength and load-bearing capacity of the concrete column? Do you need to dismantle and rework?

There will definitely be an impact.

Can you be more detailed?