What does sand and gravel include?
Sand and gravel are indispensable basic materials in construction projects and are widely used in concrete, roadbed, building blocks and other fields. With the recent recovery of the construction industry and the acceleration of infrastructure projects, the demand for sand and gravel materials continues to rise and has become one of the hot topics. This article will introduce in detail the classification, uses and recent industry trends of sand and gravel materials to help readers fully understand this important building material.
1. Main classification of sand and gravel materials
Sand and gravel materials can be divided into natural sand, machine-made sand, gravel and other types according to different sources and particle sizes. The following are the detailed classification and characteristics of sand and gravel materials:
| type | source | Particle size range | Main purpose |
|---|---|---|---|
| natural sand | River beds, lakes, beaches | 0.075-4.75mm | concrete, mortar |
| Machine-made sand | Rock crushing processing | 0.15-4.75mm | concrete, roadbed |
| gravel | Mining | 5-100mm | roadbed, aggregate |
| pebble | River bed, flash flood accumulation | 5-40mm | decorate, filter |
2. Use of sand and gravel
Sand and gravel play an important role in construction projects. The following are its main uses:
1.concrete preparation: Sand and gravel are the main aggregates of concrete, which directly affect the strength and durability of concrete.
2.roadbed filling: Gravel and machine-made sand are often used to fill road bases and subgrades to provide stable support.
3.building blocks: Sand and gravel are important raw materials for the production of bricks, blocks and other building materials.
4.Decoration project: Pebbles and colored sandstone are often used in garden landscaping and architectural decoration.
3. Recent hot spots in the sand and gravel industry
In the past 10 days, the hot spots in the sand and gravel industry have mainly focused on the following aspects:
1.price rise: Affected by environmental protection policies and increased transportation costs, the price of sand and gravel materials in many places has shown an upward trend.
2.Environmental protection policies are tightened: Governments in many places have strengthened their crackdowns on illegal sand mining and promoted the popularization of machine-made sand.
3.New energy projects drive demand: The construction of new energy projects such as wind power and photovoltaics has increased the demand for sand and gravel.
4.technological innovation: The promotion of new sand-making equipment and processes has improved the production efficiency and quality of sand and gravel materials.
4. Market data of sand and gravel materials (last 10 days)
| area | Sand and gravel type | Price (yuan/ton) | Increase or decrease |
|---|---|---|---|
| East China | natural sand | 120-150 | +5% |
| South China | Machine-made sand | 80-100 | +3% |
| North China | gravel | 60-80 | +2% |
| southwest | pebble | 90-110 | +1% |
5. Summary
As the basic material of construction projects, sand and gravel materials have attracted much attention in terms of their classification, uses and market dynamics. Recently, the tightening of environmental protection policies and the promotion of new energy projects have further promoted the development of the sand and gravel industry. In the future, with the advancement of technology and standardization of the market, the sand and gravel industry will usher in a broader space for development.
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