In addition to making the cracks in the wall bigger and bigger, what are the hazards of inferior cem

The use of low-quality cement in the decoration can cause walls and ceilings to become brittle, peeling or even loose and come off the finishing material. In addition, inferior cement will also pose a serious threat to human life and health, causing great harm to the human blood circulation system, resulting in a gradual decrease in platelets and blood cells, and an increase in the incidence of leukemia. There are also some inferior cements, the content of hazardous substances exceeds the normal value by more than 3 times, which is extremely harmful to the human body.

The first is that fake cement is mixed with it. Since some manufacturers and illegal dealers are only interested in profits, there is still a large amount of low-quality cement in the home decoration building materials market. Cement quality problems have become a prominent hidden danger of building material products.

The cement produced by the small workshop, there is no cement, the unknown cement is packed on the brand packaging bag, and the high-grade cement is mixed with pulverized coal to form "inferior cement", which is not uncommon and harmful.

The second is to look at the color of the cement. In general, the color of high-quality cement is off-white. If it is dark gray or other colored cement, it is a sign that it may be adulterated with other excessive impurities.

Secondly, it can also be seen whether there are hard blocks in the cement, because the cement will form hard blocks when it encounters water or moisture, and the strength of the hard block cement will drop sharply, thus affecting its construction quality. Therefore, when choosing cement, we should choose the cement that has been produced recently. Cement that takes too long is less effective.

The second is to twist the cement by hand. If it feels rough, it means that the quality of this cement is not very good, because good quality cement feels smooth. In addition, the cement can be inspected by a professional cement inspection agency before use, so that it can be used with more confidence.

In addition to the large and unsightly gaps, inferior cement will also release a large amount of formaldehyde. There is also a great danger to the main structure of the house.

There are indeed a lot of hazards that can cause a house to collapse.

Cracks in the wall are made of low-quality cement and may be harmful to the body.

It may make the ceiling brittle or even peel off.

The damage is very large, so there is no guarantee of the solidity of the wall.

It is easy to drop slag, and the toughness is very poor, and the tofu slag project.

Generally speaking, inferior cement has many harmful substances, and such odors are harmful.

The use of low-quality cement in the renovation,It will cause the wall and ceiling to appear crispy, peeling or peeling, and even the veneered finishing material will loosen and fall off. And low-quality cement willIt poses a serious threat to human life and health and poses a great danger to the human blood circulation systemIt will cause a gradual decrease in platelets and blood cells, increasing the chance of leukemia; There are also some inferior cement with PO content that greatly exceeds the standard, exceeding more than 300% of the normal valueIt is extremely harmful to the human body.

Due to the mercenary of some manufacturers and illegal dealers, there are still a large number of inferior cement in the home improvement building materials market, and the quality of cement has become a prominent hidden danger in building materials productsIt is not uncommon for high-grade "cement mixed with pulverized coal" to be refined into "inferior cement", which is harmful to others

Observe the color of the cement, generally *** cement its color isOff-whiteIf it is dark gray or other colors of cement, it means that it may be mixed with other excessive impurities. Secondly, you can also see whether there is a hard block in the cement, because the cement will form a hard block when it encounters water or moisture, and the strength of the cement that forms a hard block will drop sharply, which will affect its construction quality. Therefore, when buying cement, you should choose the cement that has been produced recently, and the cement that has been too long has not worked so well.

Twist the cement by handIf it feels coarse, it means that the quality of this cement is not very good, because the cement is very smooth to the touch. In additionBefore use, you can go to a professional cement inspection agency for inspection, so that it is more reassuring to use. For example, 12 kilograms of cement can be randomly extracted to the institution for inspection, and the results of the inspection must meet the indicators on the packaging.

There is also a hot cement that cannot be purchased, because the hot cement is in the expansion period, and if it is used to pave tiles, the tiles are easy to bulge due to expansion.

I believe that as long as everyone willIf you buy high-quality cement, you can avoid all hazards

It will cause the main structure to mutate, causing the house to collapse.

In fact, there are many hazards, such as causing water leakage.

If it is a load-bearing wall, it is easy to cause the main body to be unstable.

Inferior cement is not sticky enough, and in addition to cracking the wall, the biggest danger is collapse.

If the cement is of inferior quality, the wall may fall off in a large area later.

It is also very likely to absorb some harmful flavors, which is not good for the body.

If the cement is too low, it is dangerous and can endanger the whole house.

It's too harmful, so don't use this inferior cement.

Dear, I am happy to answer for you: is the cracking of the cement exterior wall more cement or less What is the reason for the plastered cement mortar on the wall, and it is very normal for cracks to appear after a long time. This is called water shrinkage, the cement mortar is powdered on the wall will produce water instead of heat, so that the solid body increases, but the cement water system is decreasing, self-contraction, this situation will occur.

The quality of this crack is fine, and it is difficult for anyone to avoid it. In this case, when decorating, directly scrape putty powder and paint the wall, and this crack will be covered. If there are fracture lines in the wall, this can be checked for the foundation of the wall.

If it is a problem with the foundation of the wall, it is necessary to shovel the wall, strengthen the foundation, and paint the wall with a net. Redo the wall paint for a long time, and it will be a failure. The uneven dryness and wetness of the wall, and the wrong proportion of cement mortar will also cause such cracks.

The mixing of wall water and cement mortar is estimated by artificiality, and no one has matched it according to the ratio, more or less. The uneven dry and wet walls will polarize the dry and wet, and cracks will appear in the dust. The ratio of cement mortar is also very important.

There is less cement, more sand, and no viscosity; Too much cement, less sand, and easy fracture lines. However, these two conditions are generally not affected, and putty powder and wall paint can also be used to cover up the trembling.

1, affect the structure bearing and make safety: for the floor slab of the flexural member, the crack width is allowed to exist within a certain range, but the influence of the crack on the structure bearing is not negligible, especially some messengers in the decoration and use, will add a lot of load to the building that the designer does not consider.

2. Affect the waterproofness of the structure: In addition to affecting the safety of the structure, the most direct problem is the hazard of leakage, especially in the parts that are not prevented.

3. Affect the durability and service life of the structure: chemical erosion, freeze-thaw cycle, carbonization, steel corrosion, alkali aggregate reaction, etc. will have a destructive function on the coagulation structure. In addition to the influence of the nature of the concrete, cracks are an important influencing factor.

Many factors will contribute to the acceleration of steel corrosion, alkali aggregate reaction and carbonization rate, which will cause a decrease in durability and shorten the service life of the building.

How to avoid cracks in concrete.

1. The selection of concrete materials is respectful. We need to choose cement with low heat and low dry shrinkage. For example, Portland cement, ordinary Portland cement, or slag Portland cement. It should be noted that the content of tricalcium aluminate in the cement we choose should not be greater than 8%.

2. We also have to strictly control the mud content of coarse aggregate and fine aggregate and the particle size of coarse aggregate. At the same time, it is also necessary to strictly control the mix ratio of concrete, reduce the water-cement ratio and sand rate. Choose some concrete with a low amount of cement per unit.

3. Mix some suitable water reducers. What we need to pay attention to is to reduce the unit of water consumption. We can mix some fly ash with good water retention performance and fine particles, so as to improve the aggregate gradation and use low-flow concrete.

4. We should choose some concrete with small thermal expansion coefficient, good thermal conductivity, large specific heat, low elastic modulus, large virtual change, and small micro-expansion dry shrinkage rate. These contents need to be paid attention to when purchasing concrete, and explain to the manufacturer in advance.