Why can t sand be used directly in construction?

Sand can't be used directly for construction because it's too soft. Because the sand that can be used for construction is generally so.

Coarse sand. This is the same as cement, etc.

Chemical materials. After mixing, there can be better support, otherwise the service life of the building in the later stage cannot be guaranteed, and the safety of the building also needs to be verified, so not any sand can be used directly for construction, otherwise so much sand in the desert can also be used, but in the actual situation it is not possible.

The selection of construction sand can be used for construction sand should first be selected from the specifications of the sand, and the general sand will be distinguished according to the thickness, and the sand that can be used for construction must at least be achieved.

Medium sand. If you want to be more stringent, you need to use coarse sand. Because the concrete used in construction must have a certain thickness.

The normal use of sand is river sand, and river sand has been going through a long time.

Running water. The dirt in the sand is washed away, and there are no harmful substances in the river water, and the cost of salvaging the river sand is much lower, so the river sand has become.

Builders. The mainstream choice. There must be sand in the seawater, but the salt content in the seawater is very high, so there is also salt in the sand, so if it is combined with cement, it will be corrosive.

So something like this.

Concrete. The manufactured building is likely to corrode the steel bars of the house, and the service life of the building will be much lower, and there are also great safety hazards. So.

Sea sand. In fact, it is not suitable for use, otherwise the quality of the building is not up to standard.

Hazards of desert sand Although there are many sands in the desert, they are not suitable, because the sand in the desert is too soft, and because it has been exposed to the sun for a long time, it will make the sand continue to release harmful substances such as formaldehyde, and the sand in the desert.

Alkali content. It is also excessive, which has a lot to do with the long-term weathering of the sand in the desert, so it is not only expensive to build with desert sand, but also not very safe.

The diameter of the sand is very small, generally less than millimeters. The clay content in the sand is usually relatively high, and if used in concrete, the clay composition can greatly reduce the strength of the concrete.

Why can't the sand in the desert be used as a building material?

Don't underestimate such a common construction sand, it also has national standards! Citing the "National Standard of the People's Republic of China: Construction Sand (GB T14684-2011)", sand is divided into two categories according to the mineral source: natural sand and artificial sand

<> no matter what kind of sand, it does not include soft, weathered particles, that is, sand in the desert, for three main reasons:

1. The sand particles in the desert are too fine, and the diameter of the sand is generally below millimeters, if this sand is chosen as a building material, the mortar will be very thin and difficult to solidify;

2. The sand in the desert contains a large amount of clay, which will affect the strength of concrete, and in the construction sand, the mud content and stone powder content of natural sand and machine-made sand should be less than 75 microns, and after filtration, it can be called "sand";

3. The alkali content of the sand in the desert is very high, which is very fatal, because the cement itself is alkaline, it will react with the carbon dioxide in the air alkaline-aggregate, producing a kind of alkali-silicate gel, resulting in the expansion and cracking of concrete, the strength and durability are reduced, this chemical reaction can not be avoided, what people can do is to minimize the alkali content in the concrete, if the desert sand with high alkali content is used, this greatly increases the instability of the building as a whole.

Another is to take our country as an example, the desert sand is far away in the northwest of China, and the area where we use a huge amount is in the central and eastern coasts, the cost is too high, and it is far better to save money by using local materials.

Desert sand cannot be used for construction sand, this kind of sand is too soft, does not absorb water, and is easy to break, the difference between the two is that construction sand is a little thicker, heavier, and more absorbent, and desert sand is drier and finer.

Because this sand is not very sticky. Desert sand is not clay, while ordinary sand clay is very coagulating, and desert sand cannot be stirred together.

Summary. Dear, I'm glad to answer for you, the building answers with sand; Natural sand includes river sand, lake sand, mountain sand, and desalinated sea sand, which is professionally used for children's beaches, children's entertainment, and white sand for beach parks. 2. Artificial sand mainly includes machine-made sand and mixed sand.

In the field of construction engineering, it is an ideal production equipment for manufactured sand, bedding, asphalt concrete and cement concrete aggregates. In the mining field, it is widely used in the pre-grinding process, which can produce a large amount of fine ore and reduce the high-cost grinding load. 3. Coarse sand is mainly used for concrete of beams, plates, columns, foundations and floors.

4. The medium sand is mainly used for the plastering of interior and exterior walls and ceilings and the leveling layer of the building (roof) surface, and can also be used for the concrete of beams, plates, columns and foundations. Concrete mixing, masonry, plastering mortar 5, fine sand is mainly used for mortar for masonry masonry, when using coarse, medium sand to make concrete or plastering mortar, because the sand is too coarse and not slurry, can also be appropriately mixed with a certain amount of fine sand, but can not be mixed too much, enough is enough.

Dear, I'm glad to answer for you, the building answers with sand; Natural sand includes river sand, lake sand, mountain sand, and desalinated sea sand, which is professionally used for children's beaches, children's entertainment, and white sand for beach parks. 2. Artificial sand mainly includes machine-made sand and mixed sand. In the field of construction engineering, it is an ideal production equipment for manufactured sand, bedding, asphalt concrete and cement concrete aggregates.

In the mining field, it is widely used in the pre-grinding process, which can produce a large amount of fine ore and reduce the high-cost grinding load. 3. Coarse sand is mainly used for concrete of beams, plates, columns, foundations and floors. 4. The medium sand is mainly used for the plastering of the interior and exterior walls and ceilings and the leveling layer of the building (roof) surface, and can also be used for the concrete of beams, plates, columns and foundations.

Concrete mixing rotten finger, masonry, plastering mortar 5, fine sand is mainly used for mortar masonry masonry, when using coarse, medium sand to make concrete or plastering mortar, because the sand is too coarse and not slurry, it can also be appropriately mixed with a certain amount of fine sand, but can not be mixed too much, and it is enough to stop.

What is the price of Zhongsha.

Pro-sand ** in 16-20 yuan bag.

How much is a ton.

The average pro-price price is yuan ton.

Dear, do you want to be in the sand or in the sand?

Medium sand is commonly used in construction.

1. The sand in the desert is too smooth and has high alkali content: if the sand in the desert is used for construction, it is easy to cause chemical reactions in the sand, which will affect the safety of the building. 2. High content of harmful substances

Desert sand is basically the product of in-situ weathering, and it does not have a process of filtering out harmful substances, so it cannot be used. 3. The grading is not good, because it is weathered in situ, so there is no process of long-distance handling and sorting, so the grading is poor. 4. The sand particles are too fine and do not meet the national requirements for the fineness of sand for construction.

Woop. Desert mainly refers to a barren area where the ground is completely covered with sand, plants are very scarce, rainfall is scarce, and the air is dry. The desert is also known as "sand chaos like a cherry curtain", an area of drought and lack of water, and sparse plants.

The desert area is mostly sandy beaches or sand dunes, and rocks under the sand are often found. Some deserts are salt flats and completely devoid of vegetation. Deserts are generally aeolian landforms. There are sometimes valuable deposits in the desert oak sheds, and many oil deposits have been discovered in recent times.

The desert is rarely inhabited, and the resources are relatively easy to exploit. The desert has a dry climate, and it is also a happy place for archaeologists, who can find many human artifacts and earlier fossils.

Because the sand in the desert is too alkaline and too small in diameter.

The sand in the desert is produced in a dry natural environment and has an excessive alkali content, which is the most serious drawback. Since the current construction sand emphasizes the alkali content of the sand, once the sand in the desert is used to build a house, the sand with high alkali content will react with the cement and water, resulting in the insufficient strength of the final cement mortar. Insufficient strength of cement mortar will immediately cause cracks in the wall.

Secondly, the diameter of the sand in the desert is too small, and the diameter of the sand particles used in our daily construction is generally about 1 to 3 mm. The sand in the desert is generally less than a millimeter in diameter, and there is not enough fragmentation surface required to mix cement and asphalt, which does not meet the building requirements, so the basic requirements cannot be met and cannot be used.

Sand uses in the desert

1. Beautify the environment. The sand in the desert can be used to make a variety of artworks and decorations, such as sand paintings, sand sculptures, sand bottles, etc., showing the charm and style of the desert, adding to people's aesthetic enjoyment and cultural experience.

2. Improve the soil. The sand in the desert can be used to improve poor soils, improve soil permeability and water retention, promote the growth and development of plants, and increase the fertility and yield of the land.

3. Use energy. The sand in the desert can be used to harness solar and wind energy to build a variety of photovoltaic and wind power stations to provide clean, renewable and pollution-free energy for mankind.

There are three main reasons why sand in the desert cannot be used for construction:

One is that the sand in the desert has too high alkali content.

Second, the content of harmful substances is high, river sand is formed after many years of sedimentation, in this long time, the mud, mica and other harmful substances in the sand are filtered out; The sand in the desert is basically the product of in-situ weathering, which undoubtedly contains more harmful components.

The third is that the particles are too fine, and there is not enough fragmentation surface required to mix cement and asphalt, which does not meet the construction requirements.

Therefore, the sand in the desert cannot be used for construction.

Why can't desert sand be used for construction sand? What's the difference?

1.The sand in the desert has been eroded by the wind for a long time, and the sand rubs against each other, resulting in a very smooth sand surface with extremely small particles, which does not meet the standards of construction sand. If this kind of sand is used as a building material, the mortar will be very thin and difficult to solidify, and the completed house can be described as a "tofu slag project".

So, even Dubai, which is located in the desert, needs to import sand from Australia. The sand in the desert is formed in a dry environment and has an excessively high alkaline content, which is the most fatal drawback. Desert sand will react with some substances in building materials in use, affect the quality of sand and gravel mixtures, corrode steel bars, and pose a threat to building safety.

2.The sand in the desert contains some mud and is oily, so it cannot be directly mixed with cement to make concrete, and needs to be washed, which undoubtedly increases the difficulty and complexity of the operation. In addition, the desert has low rainfall, groundwater recharges water resources, irrigates agricultural land, and the local environment is limited, so it is impossible to complete the washing operation.

The sand in the desert is formed by wind erosion. Due to long-term mutual friction, the surface of the sand is very smooth, and the particles are too small to come together, resulting in the construction of buildings of poor quality and not up to national standards. As a result, sand in the desert is rarely used in the construction industry.

Even in Dubai, which is located in the desert, roads can only be imported from other countries.

3.The difference in size and function. Most of the sand used for construction is artificially made, or polished from some stones manually, the particles are relatively larger, the fullness is stronger, and you can clearly feel the presence of particles in your hand.

The general construction sand will use sand with a diameter of 1 3 mm, while the sand in the desert has a diameter of less than a millimeter. The high salt content of seawater, especially chloride ions, can corrode the rebar and ultimately lead to a reduction in the load-bearing capacity of the steel, making the structure built with this material unsustainable in the long term.

Because the diameter of the sand in the desert is too small and the load-bearing capacity is not good, it cannot be used for construction sand. The difference between the two is that the sand of the desert has more impurities, and the solidity is not as good as the sand used for construction.

I think the main reason is that this kind of sand is very different from the usual sand, and this kind of sand cannot be used in construction; The difference between the two is that the alkali content of the sand in the desert is very high, and most of the sand contains different special species, and the sand and gravel do not meet the basic construction sand standards, and it is very difficult to mine sand and gravel.