What is the difference between medium sand and fine sand and coarse sand

In our life, no matter it is construction, decoration or road, we can't live without a lot of sand and gravel, and sand is also a very important building material. Medium sand, fine sand and coarse sand are different specifications of sand, what is the difference between specific medium sand, fine sand and coarse sand?

Sand, called fine aggregate in construction, is divided into coarse sand, medium sand and fine sand according to the diameter particle size:

Medium sand: fineness modulus of 3.0-2.3, the average particle size of 0.25-0.5mm, particle size greater than 0.25mm particles more than 50% of the full weight;

Fine sand: fineness modulus of 2.2-1.6, average particle size of 0.35-0.25mm, particle size greater than 0.075mm more than 85% of the full weight;

Coarse sand: fineness modulus of 3.7-3.1, average grain size above 0.5mm, grain size greater than 0.5mm more than 50% of the full weight.

In addition to the above according to the degree of thickness of the sand to distinguish, but also can personally feel, the different specifications of the sand held in the hand, it is easy to form a ball for the fine sand, medium sand is very difficult to form a ball, after the hand release, easy to loose, and the coarse sand can not be held into a ball at all.

Medium sand, fine sand, coarse sand in the construction, decoration is used in large quantities, but according to its different thickness, the use will be different:

1. Medium sand: It is mainly used for internal and external walls in construction, and can also be used for concrete in beams, slabs, columns and foundations. Cement mortar made of fine sand has weak adsorption and can't stick well with each other, and the cost is high, while coarse sand may make the cement mortar crack after solidification.

2. Fine sand: mainly used for masonry, masonry mortar, sand particle size is too coarse is not easy to slurry. Wall tiles are also more suitable for the use of fine sand.

3. Coarse sand: suitable for mortar flooring, in addition to the construction, waterworks, sewage treatment plant filter media, permeable concrete, etc. will also use coarse sand, and the cost is cheap.

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