Cement is widely used in modern society because of its strong viscosity, which can firmly stick building materials such as sand and gravel with water. It can be said that because of the appearance and use of cement, developers dare to build houses higher and higher, and now twenty or thirty floors are everywhere in major small and medium-sized cities. However, the use of various materials has a certain period, and cement is no exception. According to professional investigation and study, the service life of cement is only 50 years, while the house property right stipulated in China is 70 years. Seeing this, people can't help wondering that cement can only be used for 50 years. Does it mean that there will be problems with the cement-built house in 50 years or that the house will be taken away when it expires?
The answer is no, it is not difficult to find a cement house with a service life of more than 50 years in a city. Many cement houses in life are much stronger and more durable than we thought. Some old houses only look old on the outside, but their internal quality is still very poor. In addition, there is no internal relationship between housing property rights and cement service life. These two issues are property rights and building materials, and cannot be confused. So it is not absolute that the service life of cement is only fifty years.
There is no internal relationship between housing property rights and cement service life. The cement service life is only 50 years, which is not absolute enough. So, how long is the service life of cement, fifty years or more? Before figuring out this problem, we must first understand what composition cement is made of, and whether the composition inside will change after long-term exposure to wind and sun. Cement is a powdery hydraulic inorganic gel material, which can be hardened in air or water after being mixed with water, and can bond sand and gravel together. In the final analysis, the basic materials used in cement are forged and melted stones. At present, all cement materials used in the market contain calcium carbonate rocks, silicate rocks and ores containing aluminum and iron. According to the composition of cement, daily cement can be divided into ordinary cement and special cement.
Generally speaking, the hardness and mixing strength of cement determine the quality of cement. In most circumstances, real estate never dares to make fun of the owner's life, so the developer has considered the building materials problem at the beginning of the house where the designer lives, and will adjust the house according to the local climate, so it is no problem to say that a cement house has been used for 50 years. The stability of cement houses is actually much better than people think. Because the main component of cement is hard stone, just think, whether it's the stone by the sea or the pebbles in the river, even if it's soaked in water for a long time, it doesn't seem to have changed much. Decades later, the stone may still be the same, so it is inferred that even if the service life of cement is up, the bonding performance inside can be maintained for hundreds of years.
In fact, judging from the qualitative change of cement, people use concrete to build houses. After cement is poured into water, the substance inside will fully contact with water and dissolve, forming a special structure, which can firmly lock the water molecules until the water becomes solid, and even restore the original hardness of the stone. At this time, the hardness of cement is estimated to be stronger than that of metal, and the material is excellent, so the service life will naturally become longer.
If the cement quality is qualified, the service life can reach 100 years or more. So how should people maintain and pay attention to cement, a common building material? Generally speaking, as long as the standard cement house is not excessively exposed to corrosive substances, even if it is exposed to the sun and rain for a long time, the wall of the house can generally last for about a hundred years. The hardness of cement above the standard number can be comparable to that of diamonds, and our country also stipulates that once the building life of a city exceeds 50 years, it must be reinforced again.
Of course, there are good and bad people and good and bad cement. If you encounter problem cement, its service life may have to be reconsidered. Cement is similar to a material produced and sold now, because its quality is time-sensitive. If cement is not used for more than one month, its quality will drop by 30%. If it exceeds one year, it can almost be declared useless. It is precisely because concrete buildings are related to important personal and property safety issues that people are required to treat materials strictly. For example, the quality of the selected sand must not be sloppy, the sand must be kept pure enough, and it must not be doped with excess impurities and clay, and then it can be used after thousands of washes in water.
In addition, it is also important to control the quality of concrete. Concrete is similar to a delicate little princess, and it sets for a month. In this process, the concrete can't be exposed to the sun, and the water needed every day can't be less. In this process, if you can't keep up with any link, you are likely to lose the game. In short, this statement about the service life of cement still needs specific analysis. The service life of cement is only fifty years, which is obviously not rigorous. Let's look at some university buildings. For example, the main building of the University of Hong Kong is a cement building, but the University of Hong Kong has existed for more than 100 years and now attracts a large number of tourists with its beautiful campus scenery. Therefore, the quality and service life of a building are not only around cement, but also steel and load-bearing walls play an equally important role with cement.