What does the thickness of sand mean?
In the fields of construction, engineering and geology, the thickness of sand is an important physical indicator that directly affects the performance and use of the material. This article will combine the hot topics and hot content on the Internet in the past 10 days to discuss the method of expressing the thickness of sand and display relevant standards through structured data.
1. Standards for classification of sand thickness and fineness
The thickness of sand is usually determined by sieving tests and classified according to particle size distribution. The following is a comparison of internationally accepted ISO standards and commonly used domestic standards:
| Classification criteria | Coarse sand (mm) | Medium sand (mm) | Fine sand (mm) |
|---|---|---|---|
| ISO 14688-1 | 2.0-0.6 | 0.6-0.2 | 0.2-0.06 |
| China GB/T 14684 | 1.0-0.5 | 0.5-0.25 | 0.25-0.075 |
2. Popular technology application scenarios
Applications of sand classification technology that have been hotly discussed recently include:
1.3D printing building materials: Fine sand (0.1-0.25mm) is the first choice for binders due to its good fluidity
2.water treatment filter media: The demand for medium-coarse sand (0.5-1.2mm) is growing in sewage treatment plant renovation projects
3.Intelligent screening system: AI image recognition technology can increase grading efficiency by 40%
3. Comparison of key performance indicators
There are significant differences in the physical properties of sand of different thicknesses:
| Particle size range | Bulk density (kg/m³) | Porosity (%) | Permeability coefficient (cm/s) |
|---|---|---|---|
| coarse sand | 1450-1600 | 35-40 | 1×10⁻² |
| medium sand | 1550-1700 | 30-35 | 1×10⁻³ |
| fine sand | 1650-1800 | 25-30 | 1×10⁻⁴ |
4. Latest Industry Trends
Compiled based on industry information in the past 10 days:
1. Developed by the National University of SingaporeNanoscale sand sorting technologyGrading accuracy can be improved to 0.01mm
2. The newly released "Construction Sand" standard (JGJ 52-2023) issued by the Ministry of Housing and Urban-Rural Development of China will be implemented in 2024
3. Global sand and gravel shortageMachine-made sandMarket share increases to 62%, particle size control becomes technology focus
5. Purchase suggestions
Sand selection guide for different uses:
| Engineering purposes | Recommended particle size | Mud content requirements |
|---|---|---|
| concrete pouring | medium coarse sand | <3% |
| Mortar plastering | fine sand | <5% |
| roadbed filling | coarse sand | <10% |
Conclusion
The thickness of sand is not only a basic scientific issue, but also directly affects engineering practice. With the advancement of detection technology and the improvement of environmental protection requirements, sand classification standards are developing in a more accurate and environmentally friendly direction. It is recommended that practitioners in relevant industries pay close attention to the latest standards and select sand materials with appropriate particle sizes based on specific project needs.
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