What are the characteristics of the mechanism sand made by sand making machine?

Due to regional differences in the total rock type natural variety, and its manufacturing mechanism sand in particle form, gradation and natural sand is relatively different, which caused the two materials made of concrete performance is different, so different parts of the world researchers have a lot of thinking and exploration of the characteristics of the mechanism sand and its impact on the performance of concrete.

By the process of post-processing and breaking of the mechanism sand and differentiating it by particle size, it is known that it has the following characteristics:

1. Production characteristics

The production of mechanism sand can use local materials or surplus production coarse aggregate and special mechanism sand production machine, which can control the particle shape, fineness modulus and particle gradation of mechanism sand according to the needs of the project through the adjustment of parameters such as the amount of loading rod, rod gradation, feeding volume, slurry concentration, feeding particle size, etc. It is this aspect that causes the essential difference between mechanism sand and natural sand. However, because the grain shape and gradation of mechanism sand are influenced by the mineral source, production and processing equipment and technology, the mechanism sand produced in different parts of the country will have great differences.

2. Appearance characteristics

As river sand is darker than artificial sand, resulting in high mud content but poor visibility of river sand, while artificial sand will be obvious when the stone powder content reaches only 10%, making many people afraid to use it.

3. Stone powder content

The difference between artificial sand and non-artificial sand is mainly that artificial sand contains a certain amount of stone powder, which is determined by the starting manufacturing process and is unavoidable. Stone dust has exactly the same mineral composition and chemical composition as the processed parent rock, and is processed into particles with a particle size of less than 75μm by soil removal treatment before processing. This is similar to the particles of mud in natural sand, but differs from mud in that the composition is different, the particle size distribution is different, and of course the role in use is different. The content of mud in natural sand should be strictly controlled, as it is harmful to concrete. And the right amount of stone powder in the mechanism of sand can make up for the lack of mechanism of sand concrete and ease of the problem, is a certain benefit. At the same time, the stone powder is also beneficial to improve the grading of concrete special aggregates, improve the compactness and overall performance of concrete.

4. Coarse and fine degree

When the fineness modulus is too small, the stone powder content is too much, which may make the concrete water consumption increase, shrinkage increase, strength decrease and other phenomena. In other words, the fineness modulus of the mechanism sand is affected by the stone powder content, high stone powder content, small fineness modulus and vice versa.

5. Grading condition

From the point of view of particle gradation, the mechanism sand >2.36mm and <0.15mm particles are more, especially 0.3mm~1.18mm particles are less, and sometimes there is even a certain particle grade break. Many times the gradation can only conform to the natural sand in Zone I or Zone II.

6. Particle shape

By the mechanical crushing of the mechanism of the sand particle shape is mostly rectangular, triangular or flaky, rough surface, multi-angle, which is conducive to improving the bonding of sand and cement, but the concrete and ease of damage, especially for low-strength concrete, may elevate the secretion of concrete, and a certain number of stone powder, to a certain extent, to make up for this defect.

The high performance of the mechanism sand is closely related to the quality of equipment, mother material, technology and other aspects. Limestone, granite, basalt and dolomite are usually used as the main raw materials for producing mechanism sand. From the research results of foreign countries in the mid-1990s, 19% of the base material of mechanism sand is granite and 67% is limestone, and the situation in China is basically the same.

In terms of equipment for producing mechanism sand, the commonly used equipment include rod mill, hammer crusher, cone crusher, impact crusher, impact crusher, roller crusher, etc. The main thing is to choose the suitable mechanism sand equipment according to the different requirements of producing mechanism sand.

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