Do you know that these are common terms in the sand and gravel industry?
High-performance concrete, aggregates, irregular coarse aggregate particles, natural sand, machine-made sand, artificial sand, mixed sand, fine machine-made sand, gravel, pebbles, 1-2 stones, 1-3 stones, coarse sand, medium sand , Fine sand, apparent density, bulk density, firmness, crush value index, needles, flaky particles, alkali-aggregate reaction, alkali-silicic acid reaction active aggregate, stone powder fluidity ratio, artificial sand water demand ratio ...
Last time, we have introduced industry terms such as 1-2 gravel, 1-3 gravel, coarse and fine sand, mud and powder, but there are still many that are not involved. Continue to introduce other commonly used terms in the sand and gravel industry.
1. High performance concrete
Taking the specific requirements for concrete performance in construction engineering design and construction as the overall goal, select high-quality conventional raw materials, reasonably add admixtures and mineral admixtures, use a lower water-binder ratio and optimize the mix ratio, adopt green ready-mixed production methods and strict The construction measures to make concrete with excellent mixture properties, mechanical properties, long-term performance and durability.
2. Aggregate
Granular loose materials such as rock particles act as skeletons, filling and stabilizing volume in concrete. According to the particle size, it can be divided into coarse aggregate and fine aggregate.
Coarse aggregate (gravel): Rock particles with a particle size greater than 4.75mm, including gravel and crushed stones;
Fine aggregate (sand): Rocks and particles with a particle size of less than 4.75mm, including natural sand and artificial sand.
3. Irregular particle in coarse aggregate
The smallest one-dimensional size of gravel and crushed stone particles is smaller than 0.5 times the average particle size of the corresponding particle size.
4. Natural sand
Rock particles with a nominal particle size less than 5.00mm formed by the action of natural conditions. According to different sources of production, it can be divided into river sand, lake sand, sea sand and mountain sand.
5. Artificial sand
Rocks, gravel, mine tailings or industrial waste residues are formed by soil removal mining, mechanical crushing and screening, and rock particles with a nominal diameter of less than 5.00mm.
6. Mixed sand
Sand is composed of natural sand and artificial sand organized in a certain proportion.
7. Crushed stone
Rock particles with a nominal particle size greater than 5.00mm, obtained by crushing and screening natural rocks or gravel.
8. Gravel
Rock particles with a nominal diameter greater than 5.00mm formed by natural conditions.
9. Flaky particle in artificial sand
The smallest one-dimensional size of the artificial sand particles with a particle size of 1.18mm or more is smaller than the particle whose average particle size is 0.45 times of the corresponding particle size.
10. Fineness module
An index to measure the degree of sand thickness.
11. Dust content
The aggregate content of particles with a nominal diameter of less than 80μm, including clay, silt and fines.
12.Clay lump content in sands
The nominal particle size in the sand is greater than 1.25mm, and the content of particles less than 0.63mm after washing with water and hand kneading.
13. Clay lump content in stones
The nominal particle size of the stone is greater than 5.00mm, and it becomes the content of particles less than 2.50mm after washing with water and hand kneading.
14. Crusher dust content
The artificial sand has a nominal particle size of less than 0.08mm, and its mineral composition has the same particle content as the processed parent rock.
15. Methylene blue value (MB)
An index used to determine the adsorption performance of artificial sand particles with a particle size less than 0.08mm.
16. Apparent density
The mass of aggregate particles per unit volume (including internal closed pores).
17. Tight density
Aggregate is the mass per unit volume after being solidified according to the prescribed method.
18. Bulk density
The mass per unit volume of aggregate in the state of natural accumulation.
19. Soundness
The ability of aggregate to resist fracture under the action of natural weathering or other physical and chemical factors.
20. Light material
A substance with an apparent density of less than 2000kg/m3 in sand.
21. Elongated and flaky particle
The nominal particle size of the stone is greater than 5.00mm, and it becomes the content of particles less than 2.50mm after washing with water and hand kneading.
