Why are there always cracks in the concrete floor slabs of rural houses? Is this normal?

The gap of the concrete floor slab caused by the uneven subsidence of the basic self-built houses in rural areas. In other words, the self-built villas in the countryside are not very good because they are basically not doing well, and the foundation settlement is uneven. Since everyone's house is built on the soil layer, the net weight of the rural self-built house needs to be increased above the basic, if the basic house is not strong, because the effect of the house itself will be lowered.

At this time, if the foundation settlement is uneven, it will produce the cracking of the concrete floor slab, which is also the most common reason for the cracking of self-built houses in rural areas.

Concrete. Cracks in concrete floor slabs caused by product quality problems. Because the vast majority of the concrete used in rural self-built houses is self-mixed concrete.

The concrete mixed by itself is to choose concrete gravel and gravel according to a certain ratio and water to carry out the mixing evenly, if the concrete ratio is not scientific, or the mixing is unbalanced, these conditions may cause the concrete floor slab to crack after the progress. And the cracking of this kind of concrete floor slab is serious, which is also the cracking of the concrete floor slab caused by the quality of cement.

The subgrade structure load design scheme is insufficient, and part of the subgrade has a small ability to withstand pressure, and it moves down under the force, if the internal stress is moved down.

Cracks appear in the wall beyond the structural force of the wall; prefabricated slabs with cement.

The roof of the structure, because the cement prefabricated panel itself has a large thermal expansion index, the thickness of the two pieces in the middle does not agree, and the telescopic index is different, resulting in a gap between each other; Before building a house in many villages, professional people would be invited to "look at physical geography", which is also scientifically proven.

They will draw certain implementation opinions based on multiple factors such as flowing water, cyclones, anti-counterfeiting signs, house orientation and geological structure. The cracked concrete floor slabs of the house are also due to this, such as the natural geography and topography.

The loose soil layer and the depression of the road surface caused by the soil texture are likely to lead to the instability of the foundation stone of the house and the uneven bearing capacity of the main wall with the change of timeThis will gradually lead to an imbalance in the load of the house, which in turn will accelerate the cracking of the concrete floor slab.

It is normal for concrete floor slabs to have cracks, and the concrete mix ratio of rural houses is not strict, and the maintenance conditions are not sufficient, and these situations may cause cracks in the floor slab. As long as it is not cutting corners, it will not affect the strength of the concrete, but the appearance quality will be affected.

A: Quite normal. Cracks after cement structure are a normal phenomenon, and now in the countryside or in the city, cracks will appear on the floor of all reinforced concrete bungalows, but sooner or later.

This is due to the nature of the cement itself. Many concrete decks also have cracks after a period of time and need to be repaired.

It is because the quality of this concrete house is not particularly good, and after the light, the water inside will evaporate, so it will cause cracks. This kind of situation is relatively normal, and generally this kind of house is more dangerous.

In the process of building houses in rural areas, if the structural design is unreasonable, there will be cracks in the floor slab, which is not a normal phenomenon, which is a dangerous building.

The first point is likely to cause the loopholes of the entire layout, the second point is likely to cause water leakage, which is very terrible, and the third point is likely to cause this crack, and it will cause collapse, to prevent cracks in the floor slab, the best way is that the concrete must be mixed evenly.

When there are cracks in the floor slab, it will leak on a rainy day. The furniture in the house will get wet. Therefore, when making cast-in-place concrete, you should add more cement and not miss every gap, so that there will be no cracks.

If there are cracks in the concrete floor slab. It will affect the overall safety of the house. When pouring concrete, the temperature should not be too high or too low. Temperatures that are too high or too low will affect quality. If the temperature is too high, a large number of cracks will occur.

If the foundation of the building is not strong, it will sink due to the gravity of the building itself. At this time, if there is uneven settlement, there will be cracking of the floor slab, which is also the most common reason for cracking in self-built houses. In fact, this question is not accurate, it should be said that there is a certain probability of cracks in the cast-in-place roof of self-built houses, but it is not "always cracks", in fact, the probability of cracks is still small, and most of them will not have cracks.

<>In some areas, due to the poor conditions of farmers' families, in order to marry, they have to cut corners and reduce costs for various materials, resulting in house quality problems; Fortunately, at the end of last year, it was restored, mainly by using wooden piles to support the floor slabs, then pouring cement into the cracks, and then dismantling the wooden piles when they were completely dry.

When mixing concrete, many workers do not strictly follow the standard to mix evenly, if the concrete is mixed unevenly, there is a difference in expansion and contraction between sand and various materials, which will make it and other materials have great problems in the fusion, resulting in cracks. Most of them are rammed and rammed with red brick foundations, which is difficult to ensure that the foundation does not settle. So there will be cracks.

Since the building needs to be built with two or three floors, there are ground beams, so cracks will soon appear.

First, the material problem, the mix ratio before concrete mixing, the pouring process did not control the heat of hydration, and the curing was not timely. Second, the support system problem, the foundation support template has not been strictly treated. In the countryside, building a house, digging the foundation, construction, all rely on their own experience; On the design drawings, there is only one floor plan at most, and many of them are drawn at home.

In the structure of the house, design evaluation, it is difficult to standardize, there are a lot of quality problems, and everything in the rural self-built houses comes from the experience of the mud masters, if you are unlucky, just meet a half bucket of water master, really dare not guarantee how reliable the quality of the project will be, so this is the main reason for the cracking of the rural self-built houses.

It is very likely that the structure of the house is not particularly solid, it may also be because there are serious problems in the market for these concretes, or it may be because it has been built for a long time, and it needs to be repainted at this time.

This is because the cement is not completely dry when it is laid, so cracks appear, and the solution is to get some new cement to mix it evenly and apply it to the wall.

Because the sun is too strong, if the cement is too strong by the sun, there will be cracks, and if you want to solve the problem, you must cover the cement with a layer of plastic sheeting.

The reason is that the quality of the prepared concrete raw materials is unqualified, the construction mixing is uneven, the temperature is too low, and the speed is too fast.

The concrete floor slab of the rural self-built house always has a direct relationship with the purchase of concrete materials or the proportion of various materials in the concrete, in addition to the construction requirements are not strict, or the concrete is not evenly stirred, or the external environment temperature is too low during construction, and the construction speed is too fast, which is the main reason for the cracks in the concrete floor slab, and if you want to solve these problems, you must start from the source, and avoid these problems when purchasing materials and construction.

First, the problem of raw materials

The problem of raw materials is that the concrete floor slab of rural self-built houses always has cracks, because the concrete of the concrete floor slab is made of cement, sand and gravel and other raw materials mixed together by mixing, if the purchased raw materials are unqualified, or the proportion between them is improper, it will lead to the production of unqualified concrete quality is not up to standard, the strength of the badge concrete work performance becomes poor, and it is easy to appear cracks after the floor is made.

Second, construction issues

Construction problems are also the main reason why there are always cracks in the concrete floor slab of rural self-built houses, if the temperature of the external environment is very low during construction, or the mixing time of concrete is not enough, the quality of concrete will deteriorate, and the floor slab produced is prone to cracks, and in addition, the pouring speed is too fast or the tamping time is insufficient when producing the floor slab, which will also affect the quality of the floor slab, and it will make cracks.

3. How to avoid cracks in concrete floor slabs

Rural self-built houses want to avoid cracks in the floor slab, we must pay more attention to the purchase of concrete, we must buy those high-quality concrete with the right ratio and the quality of raw materials, we can not buy those inferior concrete, the floor made of concrete is prone to cracks, in addition to the process of processing and producing the floor slab, we must choose a relatively warm weather, and we must control the mixing time of the concrete, and control the speed when pouring, and we can not blindly seek speed. Doing this will prevent cracks in the floor slab.

Because the quality is not up to par, the foundation is not solid. You can remove all these earthen floor slabs and replace them with a new batch, so that there will be no cracks.

There are always cracks in the concrete floor slabs of self-built houses in rural areas, because the waterproof system is not done well, and this can only be solved by inviting special personnel to come to the door.

It may be because there is a problem with the raw materials, it may be because the concrete is not up to standard at all, it may be because the strength is relatively low, the working performance is relatively poor, it may also be because of the uneven mixing in the construction process, it may be that the maintenance work is not done.

It may be that the weather is too wet, or the weather is too dry, so there are cracks. We can just use plaster to patch this crack.

Many people find that there are always some cracks in the floor slab of their own houses, why does this happen? In fact, not only in rural areas, this phenomenon is not uncommon in commercial housing built in cities.

1. Plastic shrinkage cracks on the concrete surface.

2. Due to the difference between itself or the environment before and after hardening, cracks are formed by thermal expansion and cold contraction.

3. The composition of commercial concrete itself is composed of a mixture of various materials and additives, and the chemical reaction of these additives in the air is also the cause of surface cracking.

4. The cement in the concrete emits a lot of heat in the hydration reaction, which causes the temperature of the concrete to rise, and forms a temperature difference with the external air temperature, and directly affects the cracking and crack width of the concrete.

Why is the problem of "cast-in-place slabs easy to crack" in rural self-built houses?

In the countryside to build their own house, cast-in-place slabs in the use of a long time, are prone to cracks, so the problem is in the **, the following and the author to see, the specific reasons are many, when pouring concrete, with the same, the future maintenance is not appropriate for many reasons have an impact on it.

01. If the concrete mix ratio is not appropriate, and the quality does not meet the requirements, if the concrete mix ratio does not meet the standard, the poured cast-in-place slab is easy to cause cracks. If the amount of cement is small, the strength will not be achieved. However, if the amount of cement is large, although the strength will go up, the shear resistance is not high, so the mix ratio is very critical, and only when the most advantageous can it achieve both strength and shear resistance, so as to achieve the quality standard.

The concrete mix ratio is important, but the mixing should also be uniform, if the mixing time is not enough, then the various materials of the concrete are unevenly distributed, and cracks are particularly prone to appear after the pouring is completed.

02, after the pouring is completed, the maintenance may not be done well in the general rural self-built houses, after the pouring is completed, as for how to maintain is a lack of some professional knowledge, many people know how to water and maintain, as for how much to water each time, how many times to water, how to protect if the sun is exposed. Cloudy days or other special weather, how to maintain. Many people don't know at all, so if the cast-in-place slab is not in place because of maintenance, there will be cracks.

03, the natural weather also has an impact, pay attention to the daily maintenance of the house cast-in-place board is on the roof, wind and sun are essential, and the roof must be damaged after a long time. In the buildings in the city, the top floor is also prone to cracks, although the top floor of the building will be gifted, but ** is still the cheapest of all floors. The main reason is that the roof is prone to leakage after a certain period of time, so the house must need maintenance.

The same is true for cast-in-place slabs in rural areas, which are prone to cracks after being exposed to wind and sun. Therefore, the daily maintenance should not be less, and the interval should not be particularly long. It's hot in the summer and cold in the winter.

The damage to the roof is very serious, generally except for the floor of the roof, the cast-in-place slab will not crack due to the influence of natural weather.

The first reason for the cracks of the cast-in-place slab of self-built houses in rural areas is that the concrete mix ratio is improper, which is the most likely to cause the cracking of the cast-in-place slab. If the concrete is mixed unevenly, it will also cause cracking. There is also the maintenance of the pouring, if the curing does not reach a certain time, the strength of the concrete does not meet the standard.

Natural weather also has an impact, and after the roof is exposed to the wind and sun, cracks generally appear for about ten years, so it is necessary to pay attention to maintenance. The author believes that the cracks of the cast-in-place slab of rural self-built houses. There are more than the above reasons, so be careful to prevent cracks.