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 should be based on the standards set for urban road projects, as outlined in the following table. These specifications ensure that the stone chips meet the necessary criteria for durability, stability, and performance in asphalt pavement construction. **Asphalt Concrete Chip Specifications** | Specification | Nominal Particle Size (mm) | Percentage of Mass Passing Through the Following Mesh (%) | |--------------|-----------------------------|----------------------------------------------------------| | | | 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 | | S16 | 0–3 | – | – | 100 | 85–100 | 20–50 | 0–15 | Note: This table is based on the specifications for asphalt pavement construction and acceptance. It provides a reference for selecting appropriate stone chips to ensure proper compaction and long-term performance of the asphalt base layer. II. Quality Requirements for Selecting Mineral Powder for Asphalt Concrete Base The selection of mineral powder for asphalt concrete base should also follow the guidelines established for urban road projects. The quality of the mineral powder plays a critical role in the adhesion between the asphalt binder and aggregate, influencing the overall strength and longevity of the pavement. **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** | 100% passing through 0.075 mm sieve | 100 | | | 90–100% passing through 0.15 mm sieve | 90–100 | | | 70–100% passing through 0.3 mm sieve | 70–100 | | | Appearance | No lumps | | | Hydrophilic coefficient | Not specified | Note: This table is also referenced from the asphalt pavement construction and acceptance specifications. It ensures that the mineral powder meets the required properties to enhance the performance of the asphalt mix. In addition to these specifications, it's important to conduct regular testing and inspections during the material procurement process to ensure compliance with the design requirements. Proper storage and handling of both stone chips and mineral powder are equally essential to maintain their quality before use.

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