Is it dangerous to crack the floor slab? Do cast in place floor slabs have cracks that affect safety

If there is a crack, it depends on what kind of crack it is. Generally speaking, cracks parallel to the beams of the room are quality problems, but they are basically not dangerous and will not hinder the use of the cracks after repair. If the crack is at a 45-degree angle to the corner of the wall or perpendicular to the beam, it means that the house has serious settlement and structural quality problems.

Look at the exterior wall of the house for cracks, if there are cracks, it is also a serious quality problem. Look at whether there are cracks in the load-bearing wall, if the cracks run through the entire wall and wear to the back, it means that there are hidden dangers in the house, and the buyer must not have a fluke mentality for this kind of house.

If there is a crack in the parallel part of the beam in the room, there is generally no danger, and the crack only needs to be repaired. 2. If the extension trend of the crack forms a right angle with the beam, or forms a 45-degree angle with the corner of the wall, it means that the house is sinking seriously and is very dangerous, and professionals must be hired to strengthen and repair it immediately.

Nowadays, there are many reasons for cracks in the floor slab, such as: insufficient maintenance, water-cement ratio is not well adjusted, and there is a lot of mud content. Therefore, in the early stage of construction, it is very important to find a professional construction team, if the foundation design is not treated, it will cause uneven subsidence, so that the structure above becomes additional stress, so that the floor slab cracks.

Before building a house, it is necessary to make a detailed design drawing, so that the occurrence of floor cracks can be reduced from the root, and the floor cracks found in the later stage, do not worry too much, the floor cracks are usually very small, about 1 or less more, you can use the method of low-pressure grouting, the effect is better, and the cost is not high.

If the cracks are linear, the length is different, not connected to each other, this situation in the countryside is also trowel treatment, but be sure to do a good job of maintenance, wait for the completion of the decorative surface of the floor slab, there will be no floor drain, if the crack in the floor is very small, usually use pouring asphalt to do a waterproof treatment, if the area involved is very large, you should consider reworking from scratch.

If there is a crack, you need to look at what kind of crack, and you need to determine what kind of crack it belongs to according to the actual situation.

If the crack is parallel to the beam, it is a quality problem, but there is no danger and it will not affect the use after repair. If the crack angle is 45 degrees from the corner of the wall, it means that the house is sinking seriously and there is a quality problem in the structure. If a crack runs through the entire wall, there is a danger and you should be careful.

Analysis of the causes of cracks in the floor slab:

1. Cracks caused by temperature changes. This is generally very shallow, because there is no timely sprinkling maintenance of the concrete, in this case it will lead to some cracks in the shrinkage, it can be said that this is a common quality problem, can be treated.

2. Cracks caused by inappropriate formwork removal time. Under normal circumstances, the formwork is dismantled too early, because the strength of the concrete has not yet reached the time, and then there are some cracks in the concrete.

3. Artificially caused cracking. It is generally caused by the rush of the construction period, you must know that you must wait for the concrete to reach a certain strength after the construction can be carried out on it, but now many developers in order to catch up with the construction period, shorten the time of the construction period, so that it may disturb it to cause a crack.

4. Settlement cracks. This is very unlikely, and subsidence cracks are also structural problems, and they are likely to get worse. In most cases, it is caused by foundation subsidence, and when there are settlement cracks, it is best to identify them with relevant departments and deal with them with corresponding solutions.

Cracks in floor slabs are not necessarily structural problems, ordinary concrete structures will have cracks, as long as the crack width does not exceed the code regulations, it is qualified and safe.

Summary. If the cement quality in the concrete is not good, it will cause cracks; Improper maintenance during the manufacturing process can also produce cracks. Because concrete is a multi-component composite, it hardens and produces volumetric deformation under the conditions of temperature and humidity changes.

Due to the inconsistent deformation of various materials, there are micro-cracks between the aggregate and the cement bonding surface or the cement itself, which are generally called microcracks. The distribution of such micro-cracks is irregular and incoherent, which does not affect the safety of the use of floor slabs.

However, this kind of fine crack will be under the action of load or further produce temperature changes, maintenance is not in place, water loss and shrinkage, the crack begins to expand, and gradually communicates with each other, so that there is a large visible crack, become a macroscopic crack, seriously form the floor slab up and down through the joint, which becomes a harmful crack. Such cracks will cause serious harm to the bearing capacity, fire resistance, impermeability, steel corrosion resistance, chemical erosion resistance and other durability properties of the structure, and affect the bearing capacity and safety of the structure.

In addition to affecting the safety of the structure, the most immediate problem for users is the hazard of water leakage. At the same time, water leakage will directly affect the strength of the steel bar, because the steel bar will rust and corrode after a long time, resulting in a decrease in strength, which will further affect the bearing capacity and safety of the structure. The durability and service life of the structure are further reduced.

Do cast-in-place floor slabs have cracks that affect safety?

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If the cement quality in the concrete is not good, it will cause cracks; Improper maintenance during the manufacturing process can also produce cracks. Because concrete is a multi-component composite, it hardens and produces volumetric deformation under the conditions of temperature and humidity changes. Due to the inconsistent deformation of various materials, there are micro-cracks between the aggregate and the cement bonding surface or the cement itself, which are generally called microcracks.

The distribution of such micro-cracks is irregular and incoherent, which does not affect the safety of the use of floor slabs. However, this kind of fine crack will be under the action of load or further produce temperature changes, maintenance is not in place, water loss and shrinkage, the crack begins to expand, and gradually communicates with each other, so that there is a large visible crack, become a macroscopic crack, seriously form the floor slab up and down through the joint, which becomes a harmful crack. Such cracks will cause serious harm to the bearing capacity, fire resistance, impermeability, steel corrosion resistance, chemical erosion resistance and other durability properties of the structure, and affect the bearing capacity and safety of the structure.

In addition to affecting the safety of the structure, the most immediate problem for users is the hazard of water leakage. At the same time, water leakage will directly affect the strength of the steel bar, because the steel bar will rust and corrode after a long time, resulting in a decrease in strength, which will further affect the bearing capacity and safety of the structure. The durability and service life of the structure are further reduced.

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Summary. Hello, I'm glad to answer for you: this is not normal. There are many reasons for cracks, which can be divided into structural cracks, wall cracks caused by temperature changes, cracks in the insulation layer of external walls, etc., and some cracks can be treated simply as long as they are treated.

Hello, I'm glad to answer for you: this is not normal. There are many reasons for cracks, which can be divided into structural cracks, wall cracks caused by temperature changes, cracks in the insulation layer of external walls, etc., and some cracks can be treated simply as long as they are treated.

Expansion: 1. Causes of cracks There are many reasons for concrete cracks, including cracks caused by deformation: cracks caused by temperature changes, shrinkage, expansion, uneven subsidence, etc.; cracks caused by external loads; There are cracks caused by improper maintenance of the environment, etc.

The cracks of commercial concrete cast-in-situ floor slabs are mainly distributed in the concave and convex parts of the slab corner, the middle of the slab span and the concave and convex parts of the floor, among them, the 45o cracks in the slab corner are common, and the distribution and number of cracks in the floor span show a certain randomness, but the most transverse and longitudinal are the most, and the probability of cracks in the middle of the large-span bay is larger, and the cracks are mostly transverse and a few are longitudinal; Longitudinal cracks mostly occur near long transverse walls (ring beams) with continuous lengths; Sometimes there are irregular cracks in the board surface. Another part of the common occurrence of cracks in the floor slab is the notch of the floor slab, where the cracks are mostly transverse and a few are longitudinal cracks. Sometimes a small number of random cracks with no obvious commonality occur.

Most of the floor slab penetration cracks mainly appear in about a year after the concrete is poured, and most of the cracks in each part of the slab corner and mid-span crack are or eventually develop into a complete penetration type, while the slab surface crack is mainly a surface layer crack.

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Hello, glad to answer for you. Houses with cracked floor slabs will not collapse.

Second, the crack treatment method: 1Cracks caused by temperature changes are difficult to repair, but there is no danger of a house collapsing.

In order to avoid the occurrence of such cracks, it is necessary to solve the problem by solving the difference between the line swelling of the two different materials of the roof and the brick wall. Generally, the common method is to do a good job of roof insulation. 2.

Due to the cracks caused by the insufficient stiffness of the masonry, the brick wall will show flat bending, and at the midpoint of the bending length, there are often horizontal trending cracks. In this case, reinforcement measures should be taken. Pure cement slurry can be injected into the cracks by pressure grouting, and then methods such as adding pilasters or reinforcing the walls between windows can be adopted.

3.Walls with such cracks are in danger of collapsing due to cracks caused by insufficient masonry strength. Take reinforcement measures.

Generally, it is reinforced by adding pilasters or using steel structure. 4.Due to the uneven settlement of the foundation, the cracks in the brick wall are located in different directions, and the positions and trends of the cracks caused by the lack of strength and stiffness of the wall columns are different.

That is to say, the cracks caused by the uneven subsidence of the foundation do not cause the strength or stiffness of the wall columns, and are repaired with cement mortar after the settlement is stabilized. 5.If the stiffness and strength of the wall column components and the house structure are sufficient, then the wall cracks caused by the uneven subsidence of the foundation do not need to be reinforced and reinforced, as long as the cracks are repaired.

Summary. There is still a certain danger after the cracking of the floor slab, but it also depends on the cracks of the floor slab, if the cracks of the floor slab are parallel to the beams, then basically there will be no danger, this is still the quality of the floor itself. But if the direction of the floor cracking is opposite to the beam, there is a certain danger, it is easy to lead to the settlement of the house, and the structure of the house may also have some problems, if there is a crack in the floor slab, then we still have to pay attention to the problem, you can find a professional person to repair it, and if the house has some quality problems, it is also very dangerous to live.

There is still a certain danger after the cracking of the floor slab, but it is also necessary to look at the cracks of the floor slab. But if the direction of the floor cracking is opposite to the beam, there is a certain danger, it is easy to lead to the settlement of the house, and the structure of the house may also have some problems, if there is a crack in the floor slab, then we still have to pay attention to the problem, you can find a professional person to repair it, and if the house has some quality problems, it is also very dangerous to live.

Cracks on the floor slab are a very common phenomenon, if you want to know whether it is dangerous, then we must first observe the degree and specific situation of the crack. If there is a crack at the top of the slab, and it is a crack that usually occurs, and the size of the crack has reached about one centimeter, then it is facing the phenomenon of the collapse of the building, because the building has been severely deformed. If you find that there are some very small cracks on the floor slab, and they are densely packed, then there is no great danger, it may be because you did not maintain it well when you hit the concrete, or the protective layer of the steel bar upward is not reserved to more than two centimeters.

A millimeter of cracking can pass, but a centimeter is not good, for safety reasons, it is better to rework a little. Good. ok