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D2489 – Standard Test Method Technical Guide
📐 Scope and Terminology
ASTM D2489/D2489M‑24 provides a test method for estimating the degree of particle coating in asphalt‑aggregate mixtures by classifying the percentage of coarse particles that are completely coated. The standard is under the jurisdiction of Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.23 on Plant‑Mixed Asphalt Surfaces and Bases. It was originally approved by Subcommittee D04.90 on June 29, 1999 (see Note 1).
Key terminology follows Terminology D8, and mixing plant terms are based on Specification D995. The test is intended for research and informational purposes only because a complete precision and bias statement has not been developed (Section 1.4).
| 🟦 Designation | 📏 Title |
|---|---|
| D8 | Terminology Relating to Materials for Roads and Pavements |
| D979/D979M | Practice for Sampling Asphalt Mixtures |
| D995 | Specification for Mixing Plants for Hot‑Mixed, Hot‑Laid Bituminous Paving Mixtures |
| D3665 | Practice for Random Sampling of Construction Materials |
| D3666 | Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials |
| D4215 | Specification for Cold‑Mixed, Cold‑Laid Asphalt Paving Mixtures |
| D8055 | Guide for Selecting an Appropriate Electronic Thermometer for Replacing Mercury Thermometers in D04 Road and Paving Standards |
| E11 | Specification for Woven Wire Test Sieve Cloth and Test Sieves |
⚙️ Test Procedure and Significance
The procedure requires sampling asphalt mixtures according to Practices D979/D979M and D3665 to obtain representative material. Mixing equipment must comply with Specification D995 for hot‑mixed mixtures or Specification D4215 for cold‑mixed applications. Sieves used for particle classification must meet Specification E11.
Coating is estimated by visually classifying coarse particles as completely coated or not; the result is expressed as the percentage of fully coated particles. This helps establish the minimum mixing time needed for satisfactory coating under given conditions and can also assess coating retention in stockpiles of cold mixtures. As per Section 1.2, values must be reported consistently in either SI or inch‑pound units without combining systems.
⚠️ Important Note: This test method lacks a complete precision and bias statement. It is intended for research and informational purposes only and should not be used for acceptance or rejection of materials in purchasing.
📊 Key Considerations and Limitations
The method is applicable to asphalt mixtures and cold‑mixed, cold‑laid paving mixtures as specified in D4215. It provides an estimate based solely on coarse particle coating and does not address all safety concerns; users must establish appropriate safety, health, and environmental practices (Section 1.5). The standard follows internationally recognized principles from the WTO TBT Committee (Section 1.6).
Proper sampling and equipment are essential for reliable results. Ensure sieves conform to E11, mixing plants to D995, and thermometers to D8055.
| 📐 Attribute | 🎯 Detail |
|---|---|
| Standard Designation | D2489/D2489M −24 |
| Original Subcommittee Approval | June 29, 1999 by D04.90 |
| Current Edition Year | 2024 |
| Unit System Requirement | SI or inch‑pound used independently |
💡 Best Practice: Always follow the random sampling procedures of D3665 and use calibrated equipment per D8055 to improve the reproducibility of coating estimates.
❓ Frequently Asked Questions
🔍 What is the purpose of ASTM D2489?
D2489 estimates the degree of particle coating in asphalt mixtures by determining the percentage of coarse particles that are completely coated, which aids in optimizing mixing time and verifying stockpile quality.
💡 How is the coating degree estimated?
Coarse particles are visually classified as completely coated or not after sampling and mixing per referenced standards. The result is reported as the percentage of fully coated particles.
⚡ What are the main limitations of this test method?
The standard does not have a complete precision and bias statement; therefore, it is intended for research and informational use only and should not be used for material acceptance or rejection.
📌 What equipment standards are referenced in D2489?
Key equipment standards include E11 for test sieves, D995 for mixing plants, and D8055 for electronic thermometers.