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D6155-19 – Standard Test Method Technical Guide
ASTM D6155-19 specifies the requirements for coarse aggregates that are not traditionally used in asphalt paving mixtures. These nontraditional aggregates are defined as any aggregate other than those covered by specifications D692/D692M, D693, D1139/D1139M, and D5106, which include crushed stone, crushed hydraulic-cement concrete, crushed blast-furnace slag, steel furnace slag, and crushed gravel. This standard is intended for use with asphalt paving mixtures conforming to ASTM D3515 or D4215.
📐 Scope and Definition
The scope of this specification, as outlined in Section 1, covers nontraditional coarse aggregates for asphalt paving. The text includes notes and footnotes for explanatory purposes, which are not considered mandatory requirements. The values stated in SI units are regarded as standard. Sieve sizes are identified by their standard designation in Specification E11, with alternative designations provided for information only.
⚙️ Test Methods and Quality Requirements
The standard references several ASTM test methods to ensure the quality of nontraditional aggregates. These include Test Method C131/C131M for resistance to degradation by abrasion and impact, Test Method C88/C88M for soundness by use of sodium sulfate or magnesium sulfate, and Test Method C136/C136M for sieve analysis. Additionally, Test Method C142/C142M for clay lumps and friable particles, and Test Method C29/C29M for bulk density and voids are referenced.
| 🟦 ASTM Method | 📏 Description | 🎯 Measured Property |
|---|---|---|
| C131/C131M | Los Angeles Abrasion | Degradation Resistance |
| C88/C88M | Soundness (Sulfate Attack) | Durability |
| C136/C136M | Sieve Analysis | Particle Size Distribution |
| C142/C142M | Clay Lumps and Friable Particles | Deleterious Material Content |
📊 Specifications and Usage Considerations
Nontraditional coarse aggregates must be suitable for use in asphalt paving mixtures. The specification does not provide specific numerical limits but relies on the referenced standards for properties such as size classification (ASTM D448) and sampling (ASTM D75/D75M). The standard emphasizes that these aggregates should be evaluated using the referenced test methods to ensure they perform adequately in pavement applications.
💡 Note: As per Note 1 of the standard, sieve sizes are designated per ASTM E11. The alternative designations in parentheses are for informational purposes only and do not represent different standard sieve sizes.
❓ Frequently Asked Questions
🔍 What are examples of nontraditional aggregates?
Examples include recycled concrete aggregate, ceramic slag, or other industrial by-products not specified in traditional aggregate standards.
💡 How is soundness testing conducted?
According to C88/C88M, the aggregate is subjected to alternate immersion in a sulfate solution and drying to simulate weathering effects.
⚡ What is the significance of the Los Angeles abrasion test?
This test measures the resistance of aggregates to wear and tear, which is critical for pavement durability.
📌 Are there any specific safety instructions in the standard?
Section 1.4 states that the standard does not address all safety concerns. Users must establish appropriate safety, health, and environmental practices and determine regulatory limitations before use.