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D2026 – Standard Test Method Technical Guide
ASTM D2026/D2026M-15 (Reapproved 2021)´1 specifies requirements for slow-curing (SC) cutback asphalts, primarily used in pavement construction and treatment. This standard ensures materials possess consistent properties such as viscosity, flash point, and distillation behavior, enabling safe and reliable application in tack coats, prime coats, and surface treatments.
🔍 Scope and Referenced Documents
This standard covers slow-curing petroleum asphalts for pavement construction. It references several ASTM test methods to evaluate critical material properties. Both SI and inch-pound units are used, and each system must be applied independently. The standard also clarifies that notes and footnotes (excluding those in tables and figures) are not considered requirements.
| 🟦 Referenced Standard | 📏 Test Method | 🎯 Property Evaluated |
|---|---|---|
| D92 | Flash Point (Cleveland Open Cup) | Safety during heating |
| D2170/D2170M | Kinematic Viscosity | Flow and consistency |
| D402/D402M | Distillation of Cutback Asphalt | Volatility and residue yield |
| D243/D243M | Residue of Specified Penetration | Hardness of residue |
| D113 | Ductility of Asphalt Materials | Elastic properties |
| D2042/D7553 | Solubility in Trichloroethylene or N-Propyl Bromide | Asphalt purity |
| D95 | Water in Petroleum Products by Distillation | Water content |
⚙️ Test Methods and Procedures
The material must be sampled in accordance with Practice D140/D140M. The following test methods are used to determine compliance with Table 1 requirements:
- Flash Point: Determined via Test Method D92 using the Cleveland Open Cup apparatus to identify safe handling temperatures.
- Viscosity: Kinematic viscosity is measured per D2170/D2170M to characterize consistency.
- Distillation: Performed according to D402/D402M; receivers graduated in 0.1 mL divisions may be used for improved accuracy (see Note 1).
- Residue: Asphalt residue with specified penetration is obtained using D243/D243M.
- Ductility: Measured with Test Method D113.
- Solubility: Determined in trichloroethylene or N-propyl bromide per D2042/D7553.
- Water: Tested via distillation per Test Method D95.
💡 Note 1: If a 100 mL graduate does not provide sufficient accuracy for distillation readings, receivers graduated in 0.1 mL divisions should be used per Note 1 of the standard.
📊 Key Properties and Compliance
The cutback asphalt shall not foam when heated to application temperature and must conform to all limits prescribed in Table 1 of the standard. Essential properties addressed include flash point, kinematic viscosity, distillation fractions, residue ductility, and solubility. For exact numerical requirements, consult the latest Table 1 in the specification.
⚠️ Editorial Update: Section 1 was updated editorially in November 2021 (ε1). Always verify you are using the most current revision for procurement or testing.
❓ Frequently Asked Questions
🔍 What are typical applications for SC cutback asphalt? Slow-curing cutbacks are used in tack coats, prime coats, and surface treatments where a slower evaporation rate is advantageous for proper adhesion and curing.
💡 How is viscosity determined for this specification? Kinematic viscosity is measured using Test Method D2170/D2170M, which ensures the material has the correct flow properties for handling and application.
⚡ Why must the material not foam during heating? Foaming indicates entrained water or volatiles, which can lead to safety hazards and inconsistent application. The standard requires no foaming at application temperature.
📌 Which solvent can be used for solubility testing? Solubility is determined in trichloroethylene or N-propyl bromide per Test Methods D2042 and D7553, depending on laboratory capabilities and regulatory considerations.