What kind of gravel is used for asphalt: analysis and structured data of hot topics across the Internet
Recently, the issue of selecting gravel for asphalt paving has become a hot topic in the engineering field. This article combines hot topics and hot content on the Internet in the past 10 days to provide you with a detailed analysis of the key elements of asphalt stones and provide structured data reference.
1. Basic requirements for stones used in asphalt
The gravel (aggregate) in the asphalt mixture directly affects the performance of the pavement. High-quality stones must meet the following conditions:
| index | Technical requirements | Common materials |
|---|---|---|
| hardness | Mohs hardness ≥6 | Basalt, diabase |
| particle size | 4.75-26.5mm (AC grade) | graded gravel |
| Mud content | ≤1% | Washed machine-made sand |
| needle flake content | ≤15% | cubic particles |
2. Recent hot topics of discussion
1.Environmentally friendly aggregate applications: The use of recycled aggregates increased by 23% year-on-year (data source: China Building Materials News)
2.Regional differences: The south tends to use granite, while the north tends to use basalt.
3.cost control: The cost savings of using manufactured sand instead of river sand are about 18-25%
| area | Preferred stone | Price range (yuan/ton) |
|---|---|---|
| East China | basalt | 85-120 |
| South China | granite | 75-110 |
| North China | limestone | 65-95 |
3. Technical specifications for stone selection
According to JTG F40-2004 "Technical Specifications for Highway Asphalt Pavement Construction":
| Asphalt mixture types | Recommended stone | Maximum nominal particle size (mm) |
|---|---|---|
| SMA-13 | basalt | 13.2 |
| AC-20 | limestone | 19 |
| OGFC-16 | granite | 16 |
4. Construction precautions
1.Moisture content control: The moisture content of the aggregate should be less than 0.5% to avoid asphalt peeling
2.Temperature matching: The heating temperature of stone needs to be 10-15℃ higher than that of asphalt
3.Grading detection: Conduct screening tests at least 3 times daily
5. Industry development trends
1.Intelligent sorting technology: AI recognition of stone shape pass rate increased to 98%
2.Solid waste utilization: The blending ratio of construction waste recycled aggregate can reach 30%
3.Special modification: The anti-slip surface layer is made of high-quality stone with a polishing value of ≥60
From the above analysis, it can be seen that the selection of stones for asphalt requires comprehensive consideration of material performance, construction conditions and economic benefits. It is recommended that engineering units make scientific material selections based on specific project needs and refer to the latest technical specifications.
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