With the reduction of natural sand, artificial sand is getting more and more attention. In the current construction industry, the proportion of sand is also increasing. Compared with natural sand, artificial sand has many advantages, but it also has some shortcomings. This article mainly introduces the advantages and disadvantages of artificial sand.
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What are the characteristics of artificial sand?
Artificial sand particles have many edges and corners, the surface is rough and not smooth, and the powder content is relatively large. A certain amount of stone powder is produced in the process of sand production, which is one of the most obvious differences between artificial sand and natural sand. The definition of stone powder refers to the particulate matter in sand whose particle size is less than 75 μm and whose mineral composition and chemical composition are the same as those of the raw material being processed.
There is a fundamental difference between stone powder and mud powder. From the perspective of fineness, tests show that the distribution of stone powder particles smaller than 75 μm is mainly concentrated above 16 μm, while the particle size of mud powder is generally less than 5 μm. Mud powder can form a wrapping layer on the surface of aggregates, which will hinder the bonding of aggregates and cement stones, so mud powder is harmful to concrete, and its content must be strictly controlled.
The stone powder in the sand, on the one hand, increases the surface area of the sand and increases the water consumption, but on the other hand, the existence of an appropriate amount of stone powder can improve the gradation of the concrete ultra-fine aggregate and the ball produced by the fine spherical particles. effect. It can improve the workability of concrete, increase the compactness of concrete, and then play a role in improving the comprehensive performance of concrete.
Advantages of artificial sand?
- Artificial sand-making materials are abundant, including rocks, pebbles, and coal gangue, which can be used as raw materials for artificial sand-making;
- The sand making technology is mature, and various sand making equipment and sand making production lines can be configured to meet various sand making needs;
- The production output of sand is stable, the production cycle of machine-made sand is short and the operation is stable, and daily 100 tons and 1000 tons are not a problem;
- The finished product of sand is of good quality. After being processed by the sand making machine, the finished product is cubic, with uniform particle size, excellent particle shape and reasonable gradation;
- The content of sand powder is controllable, and the stone powder in artificial sand can be cleaned by sand washing machine to obtain good sand.
The comparison between natural sand and artificial sand?
Compared with natural sand, artificial sand has the following differences and advantages: the material of sand washing is excellent and stable. Artificial sand washing is an artificially selected raw material. The material is uniform and stable. The mineral composition and chemical composition are consistent with the raw material. It is not as complicated as natural sand. The sand is clean, without mud and other harmful impurities, and its performance is relatively stable.
One kind of sand washing, one fineness modulus, only corresponds to one gradation. Its fineness modulus has a linear relationship with the sieve allowance of a single sieve. As long as the test is passed, a linear relationship is established, and the sieve allowance of a single sieve is measured, the fineness modulus can be calculated accurately and quickly. And general natural sand, one fineness modulus, can have many kinds of grades.
Advantages and disadvantages of artificial sand?
Advantages of artificial sand:
Without organic matter, artificial sand is pure, without organic or soluble compounds that affect the performance of cement. This ensures that the desired sand texture is maintained for good quality concrete.
To improve the quality, sand is free of clay, dust and silt coatings that increase the need for water when mixing sand with cement. Artificial sand does not affect the bond between aggregate and cement paste.
Strong usability, compared with seasonal river sand, artificial sand can be used all year round, and has the same characteristics and ph value as river sand.
There are advanced technologies to ensure that the crushed materials have suitable sand properties.
The high strength of concrete and the excellent performance, shape, texture and consistency of sand make it the most suitable sand for construction.
Durable, as the sand is made of high-quality granite, which has the chemical and physical properties of a good concrete structure. The structures can withstand extreme environmental conditions and the sand can continue to be used.
The damage to the environment is smaller, and the sand is formed using natural aggregates. Compared with river bed mining, it has less damage to the environment and is more environmentally friendly.
Cost-effective, the placer can be obtained near the job site, thereby saving transportation costs and maintaining a continuous supply of sand. Artificial sand offers a more competitive market price compared to the seasonal and fluctuating cost of river sand.
There are few construction defects. When sand is used, due to reasonable production technology, the construction defects are reduced.
Use advanced machines to produce artificial sand to ensure correct grading in production.
Disadvantages of artificial sand:
The content of fine powder is large. Due to the sand making process, compared with natural sand, artificial sand has more fine powder content, which will affect the strength of building concrete.
The technology used requires the use of modern and more advanced equipment to produce more high-quality sand, which will increase the production cost.
Workability issues, artificial sand may have a rougher and more angular texture than smooth natural sand. This requires more water and cement to achieve the desired workability.
A large number of crushers are needed, and the production of sand requires a large number of crushers to cooperate, but the more crushers will cause more production costs.
Production takes time, it takes a considerable amount of time to make the sand, to crush, screen and sometimes wash the compounds produced.
Product quality, compared with river sand, because artificial sand is artificially produced, some unscrupulous merchants will produce some unqualified products and flow into the market.
This is the full introduction of the advantages and disadvantages of artificial sand in this article, I hope it can help everyone. If there are any other questions you want to know, you can leave a comment below the article, and we will reply to everyone’s comments and messages one by one. At the same time, there are other excellent articles on our website, welcome to continue to browse.