What stones are used for railway slag stones? Comprehensive analysis of the selection criteria and material characteristics of stylus stone
Railway slag stone (also known as slag stone) is an indispensable basic material in railway track structure, and its quality directly affects the stability of the track and the safety of train operations. This article will combine the industry hotspots of the entire network for the past 10 days and systematically analyze the material selection requirements for railway slag stone from the dimensions of material types, technical standards, application scenarios, etc.
1. The core role of railway slag stone
Trace slag stone is mainly used to disperse orbital pressure, drain water and prevent silt, inhibit weed growth, and also has elastic buffering function. According to the national standard "TB/T 2140-2008", high-quality dock stones must meet the following physical characteristics:
| index | Technical requirements |
|---|---|
| Compressive strength | ≥120MPa |
| Los Angeles wear rate | ≤18% |
| Content of needle flake particles | ≤5% |
| Mud content | ≤0.5% |
2. Comparison of slag stone materials in the main channel
According to the latest technical specifications of China National Railway Group, the commonly used sluice materials can be divided into three categories:
| Stone type | Representative rock | Advantages | Application line |
|---|---|---|---|
| Igorous rock | Granite, basalt | High hardness and strong durability | High-speed rail, heavy-duty railway |
| Metamorphic rock | Quartzite, gneiss | Good weather resistance | Mountain railway |
| Sedimentary rock | Limestone, sandstone | Low cost and easy to process | Ordinary freight line |
3. New trends in selecting materials for Daozha stone in 2023
Recent industry hotspots show that Daozhashi has selected the following technical upgrade directions:
1.Improved environmental protection requirements: The use of stone with excessive radioactivity is prohibited in many places, and the procurement of granite must be accompanied by a radiation test report.
2.Recycled Materials Application: Some lines use recycled aggregates of construction waste in pilot projects, and the hardness can reach 80MPa after crushing
3.Intelligent detection popularizes: Laser particle size analyzer gradually replaces traditional screening method, and the detection efficiency is improved by 300%.
4. Material optimization in special environments
| Environmental conditions | Preferred stone | Processing process |
|---|---|---|
| Frozen soil area | Basalt | -20℃ freeze-thaw cycle test |
| Coastal areas | Quartzite | Chloride ion content detection |
| Alpine area | Diamondite | Add anti-freeze coating |
5. Procurement and construction points
According to recent bidding documents of the Railway Bureau, special attention should be paid to the procurement of Daozha stone:
1. Particle size control: Special ballast requires 25-50mm particles to account for ≥75%
2. Cleanliness requirements: powder content after washing ≤0.3%
3. Transportation specifications: Special train transportation requires pollution prevention measures
6. Future development trends
With the advancement of the construction of the "eight vertical and eight horizontal" high-speed rail network, it is estimated that the annual demand for skeleton stones will exceed 120 million tons in 2025. The industry is headingStandardized production,Intelligent laying,Environmentally friendly materialsWith three major developments, the new composite tractor materials have entered the experimental stage.
(The full text is about 850 words in total, data source: Technical specifications of China Railway Group, recent reports of China Railway Science Research Institute, bidding announcements of various railway bureaus)
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