As we all know, after the stone is broken, it becomes the gravel aggregate, which is widely used in construction, railway, highway and other infrastructure. The different requirements for sand and stone specifications are not the same. This article will introduce the most important classification standards of sand and stone specifications in detail -- according to the particle size and particle size.

The stone in the sand

The finished products of the general gravel production line are 46/24/13/12/51 stones, and then there are stone powder, coarse and fine sand; Specific stone standard specifications and models are as follows:

5-1 stone: 5-10mm gravel

1-2 stones: 10-20mm gravel

1-3 stones: 16-31.5mm gravel

2-4 stones: 10-15mm gravel (international standard 1/4 to 1/2 inch)

4-6 stones: 15-20mm gravel (international standard 1/2-3/4 inch)

The sand in the sand

According to the standards of natural sand and machine-made sand for building sand in our country:

Coarse sand: fineness modulus 3.7-3.1, average particle size above 0.5mm

Medium sand: fineness modulus 3.0-2.3, average particle size 0.5-0.35mm

Fine sand: fineness modulus 2.2-1.6, average particle size 0.35-0.25mm

Super fine sand: fineness modulus 1.5-0.7, average particle size 0.25mm has been under

Other specifications and standards for sand and stone materials

1. Needle and flake particles. The length of stone particles is 2.4 times larger than the average particle size of the particle size to which the particle belongs. If the thickness is less than 0.4 times the average particle size, it is flake particle；

2. Mud content. The particle size of the stone is less than 75um；

3. Mud block content. The original particle size of the gravel is greater than 4.75mm, and the particle content is less than 2.36mm after water immersion and hand pinch；

4. Stone powder content. Stone powder refers to rock particles with a particle size less than 0.075mm (75 microns)；

5. Robustness. The ability of sand, especially stones, to resist cracking under the action of natural weathering and other external physical and chemical factors；

Mining equipment can crush large size stone into sand and stone of various sizes to meet the different requirements of construction, railway, highway, highway and other projects on sand and stone. In addition, the industry of sand and stone needle flake particles, mud content, mud content, stone content and robustness also have the corresponding requirements, especially high-speed railway high-speed airport and other national project requirements are very strict, therefore, in the configuration of the production line to clear requirements in advance, so as not to affect the finished product market.