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D5840-00 – Standard Test Method Technical Guide
📋 Scope and Materials
The ASTM D5840-00 specification defines Type II polymer modified asphalt cement for pavement construction. It provides a reference for specifying these materials, focusing on compatibility and degree of modification rather than performance characteristics. Type II polymer modified asphalts are typically produced using styrene-butadiene rubber latex or polychloroprene latex, though any polymer that yields the required test results may be used.
📐 Physical Requirements and Testing
The polymer modified asphalt cement must be homogeneous, free from water, and must not foam when heated to 347°F (175°C). Conformance to Table 1 of the standard is required. The following test methods are used to verify compliance:
| 🟦 Property | 📏 Test Method | 🎯 Standard |
|---|---|---|
| Penetration | D 5 | ASTM D5 |
| Viscosity at 140°F (60°C) | D 4957 | ASTM D4957 |
| Viscosity at 275°F (135°C) | D 2170 | ASTM D2170 |
| Ductility | D 113 | ASTM D113 |
| Flash Point | D 92 | ASTM D92 |
| Rolling Thin-Film Oven Test | D 2872 | ASTM D2872 |
| Thin-Film Oven Test | D 1754 | ASTM D1754 |
| Toughness and Tenacity | D 5801 | ASTM D5801 |
These tests measure compatibility and degree of modification to ensure the material meets the specified requirements.
⚡ Sampling and Compatibility
Sampling must follow Practice D 140 to ensure representative specimens. The polymer modifier and asphalt cement must be compatible and pre-blended before use to achieve uniformity and desired properties.
⚠️ This specification is not performance-based; it does not guarantee specific pavement performance. Additional evaluation may be needed for intended applications.
✅ Requirements for homogeneity, freedom from water, and no foaming at 347°F (175°C) ensure proper handling and handling during construction.
❓ Frequently Asked Questions
🔍 What is the purpose of ASTM D5840-00?
It provides a specification for Type II polymer modified asphalt cement, focusing on compatibility and degree of modification for pavement construction.
💡 What polymers are used in Type II modified asphalt?
Typical polymers include styrene-butadiene rubber latex and polychloroprene latex, but any polymer meeting the required test results can be used.
⚡ How is the material tested for compliance?
Key tests include penetration, viscosity, ductility, flash point, and oven tests, each performed according to specified ASTM methods.
📌 Why is pre-blending important?
Pre-blending ensures the polymer modifier and asphalt cement are compatible and homogeneous, which is critical for achieving the desired properties.