Mechanism sand is the finished particles of rock with a particle size of less than 4.75mm, which are processed by a machine that makes sand through a number of steps.

Mixed sand is a mixture of mechanism sand and natural sand.

River sand refers to particles with a particle size of less than 4.75 mm that are naturally formed in river water by impact and erosion, and is commonly used in the preparation of concrete.

What is the difference between mechanism sand and river sand?

Six attributes comparison

1. Appearance and shape

River sand particles round and smooth, clean appearance, unscreened river sand specifications. Mechanism sand has a rough surface, sharp edges, neat specifications, and the unwashed mechanism sand is dirty.

2. Composition material

River sand from a variety of materials of stone evolution into sand after mixing, the composition is more complex, more impurities. Mechanism sand production raw materials are artificially selected, material unity, pure composition, mineral composition and chemical composition are consistent.

3. Fineness modulus

The fineness modulus of general river sand is only one, while the fineness modulus of mechanism sand can be artificially adjusted according to actual needs, and the finished product is more regular. According to the requirements of different processes, the raw materials can be processed into different specifications of the mechanism of sand, in order to better meet the needs of daily use.

4. Stone powder content

Generally speaking, the stone powder content of river sand is less, and the stone powder content of mechanism sand is greater than river sand. Usually, the industry requirements for the stone powder content of sand and gravel are Class I sand ≤ 1.0%, Class II sand ≤ 3.0%, Class III sand ≤ 5.0%. Although the stone powder content of mechanism sand is slightly larger, it can be effectively controlled by artificial to reach the standard, which will not affect the normal use.

5. Adhesion and compression resistance

River sand because of its smooth and rounded surface, in the use of cement and other substances such as bonding, adhesion and compressive effect is relatively poor. Mechanism sand particles because of its rough surface, sharp edges, in the use of cement and other substances, often have a better adhesion, better compressive effect, service life is also longer.

6. Sturdiness and durability

River sand as a building material is stronger than the solid performance of the mechanism of sand, although the solid performance of the mechanism of sand than the river sand is a little worse, but can also reach the GB/T 141684293 standard of the index of the best quality, can be widely used in ordinary concrete.

Prospect and use of competition

Prospect: natural river sand is not "inexhaustible, inexhaustible", the supply has been obviously in a tight situation. At the same time, due to the mining of natural river sand will cause damage to the environment, the government's strict control of river sand mining, illegal mining is by the country's severe crackdown. Therefore, the investment prospect of river sand is not so bright.

On the contrary, the investment prospect of mechanism sand is relatively bright. In the broad market, high-quality alternative, policy support and other factors to stimulate and promote the mechanism of sand is riding the wind, the development of the trend, the prospects are promising.

Uses: river sand can be widely used in various dry mortar after drying and sieving, is the main raw material for exterior wall insulation mortar, and is also an important material for the role of skeleton or filling in concrete. It usually plays an irreplaceable role in construction and decoration.

Mechanism sand is mainly used in construction, municipal, transportation and other construction projects in the C60 and below strength grade concrete. When meeting the corresponding technical requirements, it can also be used in harbor and water conservancy concrete projects.