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D2397 – Standard Test Method Technical Guide
📋 Specification Overview and General Requirements
ASTM D2397/D2397M – 20 establishes the standard specification for seven grades of cationic emulsified asphalt utilized in pavement construction. The standard requires the emulsion to be thoroughly homogeneous upon delivery, provided separation has not occurred as a result of freezing. Testing must be completed within a strict 14-day window from the date of delivery to ensure conformance to the specified properties.
⚠️ Critical Requirement: Emulsions that have been compromised by freezing and subsequently separated shall not be tested. Storage conditions must maintain a temperature of no less than 4 °C [39.2 °F] to preserve sample integrity.
⚙️ Required Test Methods and Property Verification
Conformance to this specification is determined through a comprehensive set of standardized test methods. The table below outlines the essential properties and their corresponding ASTM test methods referenced in the standard.
| ⚙️ Property | 📏 Standard Test Method | 🎯 Specific Notes |
|---|---|---|
| Viscosity | D7226 or D7496 | Specify which method is used in reporting |
| Storage Stability, 24h | D6930 | Measures settlement over time |
| Demulsibility | D6936 | Determines the breaking tendency |
| Coating Ability & Water Resistance | D244 | Evaluates aggregate coating characteristics |
| Particle Charge | D7402 | Confirms the emulsion is cationic |
| Distillation | D6997 | Recovers asphalt residue for testing |
| Cement Mixing | D6935 | Assesses compatibility with fine aggregates |
| Oversized Particles | D6933 | Sieve test for quality control |
💡 When reporting viscosity results