What are the requirements for the quality of asphalt and ore fines used in asphalt concrete bases?

I. Quality Requirements for the Use of Stone Chips in Asphalt Concrete Base The quality requirements for stone chips used in asphalt concrete base layers should be based on the standards typically applied in urban road construction projects. These specifications are outlined in the following table, which provides detailed gradation and performance criteria. **Asphalt Concrete Chip Specifications** | Specification | Nominal Particle Size (mm) | Square Hole Sieve (mm) | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 | Round Hole Sieve (mm) | 10.0 | 5.0 | 2.5 | | |--------------|----------------------------|------------------------|-----|------|------|-----|--------|-----------------------|------|-----|-----|---| | S15 | 0–5 | | 100 | 85–100 | 40–70 | - | 0–15 | | 10.0 | 5.0 | 2.5 | | | S16 | 0–3 | | - | 100 | 85–100 | 20–50 | 0–15 | | 10.0 | 5.0 | 2.5 | | Note: This table is referenced from the asphalt pavement construction and acceptance specifications. It ensures that the stone chips meet the necessary gradation and performance criteria to maintain the structural integrity and durability of the asphalt base layer. II. Quality Requirements for Selecting Mineral Powder for Asphalt Concrete Base Mineral powder used in asphalt concrete base layers must also meet specific quality standards, similar to those required for urban road projects. The following table outlines the key technical requirements for mineral powder. **Quality Requirements for Mineral Powder in Asphalt Concrete** | Index | Description | Asphalt Concrete Base | |-------|-------------|-----------------------| | Visual Density | Not less than (t/m³) | 2.45 | | Water Content | Not greater than (%) | 1.0 | | Fineness Range | 0.075 mm sieve | 100% | | Fineness Range | 0.15 mm sieve | 90–100% | | Fineness Range | 0.3 mm sieve | 70–100% | | Appearance | No lumps or agglomeration | No lumps | | Hydrophilic Coefficient | Not specified | - | Note: This table is also referenced from the asphalt pavement construction and acceptance specifications. Proper selection of mineral powder is essential to ensure good adhesion with asphalt and to enhance the overall stability and longevity of the pavement structure. By following these guidelines, engineers and contractors can ensure that both the stone chips and mineral powder meet the necessary quality standards, leading to a more durable and long-lasting asphalt concrete base.

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