Artificial sand, which is made by crushing stones and then grinding, is gradually becoming a substitute for natural sand and gravel, and the application of artificial sand has also become a global trend. Compared with various natural sand and gravel materials such as river sand and sea sand, where are the advantages of artificial sand?
Artificial sand is a sand-gravel material obtained after crushing by a suitable crusher and other professional sand-making equipment. Compared with natural river sand, it has the characteristics of sharp edges and sharp edges and many needles and flakes.
Distinguish artificial sand and river sand from the appearance
River sand is dug directly from the river channel, so it will be mixed with small pebbles and fine sand. These small pebbles are washed by the river for a long time, and the edges and corners are relatively round.
2. Robustness and durability
The robustness of artificial sand is slightly worse than that of river sand, but it still meets the excellent product index of GB/T141684293 standard, and there is no problem in using it in ordinary concrete. However, when used in concrete components that are often subjected to frictional impact, in addition to admixtures, the ratio of lime to sand and the crushing index of sand, and the content of stone powder should also be controlled.
3. Stone powder content
Large powder content is an important feature of artificial sand different from natural river sand. When making a distinction, we should distinguish between the powder content of artificial sand and the mud content of natural sand.
The mud content of natural sand means that the particle size is less than 0.075mm, is composed of viscous clay particles, and has a large plasticity index. It has no connection effect with the crystal stone after cement hydration. Therefore, the mud content of natural sand is directly The composition that affects the strength of concrete.
The powder content of artificial sand is finely ground rock powder less than 0.075mm. It can’t react with cement hydration, but it can have an excellent connection with cement crystal stone, and it has a filling effect of micro-aggregate in the internal layout.
In fact, if the powder content of artificial sand does not exceed 20%, it will have no adverse effect on the cohesion time and strength development of concrete, and it will have some advantages in the workability, pumpability, and strength of the concrete mixture. Better performance.
4. Adhesion and pressure resistance
The particle size of artificial sand is irregular. When using cement and other structural bonding, it tends to have better adhesion, more compression resistance, and longer service life.
5. Composition structure
Artificial sand is generally selected by man-made materials, the material is uniform and stable, the mineral composition and chemical composition are consistent with the raw materials, and it is not as complicated as natural sand.
6. Fineness modulus
Generally, natural sand has a fineness modulus and can have multiple gradations. The fineness modulus of artificial sand can be controlled artificially through the production process, and the production can be organized according to user requirements. This is something that natural sand cannot do.
In summary, artificial sand not only has a wide range of sources, but is also stable in material, is easy to operate and control, has good performance, can meet construction needs, and is economically feasible. It is the future development direction of the construction market and is also very beneficial to the protection of the natural environment. With the further adjustment and optimization of the layout and construction of the artificial sand business and the industrial structure of various enterprises, it has become the basic consensus of upstream and downstream enterprises to reduce or even bid farewell to the use of natural sand in the future. There is still a relatively large gap in market demand. Whether it is for environmental protection or from the perspective of project quality, large-scale construction and layout of artificial sand is an inevitable trend.
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