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D4223 – Standard Test Method Technical Guide
ASTM D4223/D4223M −20 establishes the standardized practices for the selection, proportioning, and fabrication of test specimens for asphalt-stabilized soils. The standard specifically covers the preparation of 100 mm [4 in.] diameter by 65 mm [2.5 in.] high cylindrical test specimens using emulsified or cutback asphalts. The primary purpose of this practice is to provide a uniform and standardized approach to specimen fabrication, which is essential for generating reliable and comparable test data for engineering design and quality assurance.
📐 Specimen Geometry and Material Selection
The standard explicitly defines the geometry of the final test specimen. Users must ensure the compacted specimen meets the specific dimensions of 100 mm [4 in.] in diameter and 65 mm [2.5 in.] in height. The materials covered by this scope include soils blended with either emulsified asphalt or cutback asphalt binders. This ensures consistency in the physical dimensions and material composition of every test specimen prepared under this standard.
🧪 Specimen Fabrication Procedures
The practices involve the mechanical compaction of the asphalt-soil mixture into a mold to achieve the specified geometry. The standard emphasizes that it offers a set of instructions for performing these specific operations but cannot replace professional education or experience. It must be applied in conjunction with professional judgment. The standard is not intended to represent the standard of care for professional services, and its application must consider the unique aspects of each specific project.
⚖️ Units, Significant Digits, and Professional Judgment
All data associated with this standard must strictly adhere to the unit system guidelines. Values stated in either SI units or inch-pound units are to be regarded separately as standard. Combining values from the two systems may result in non-conformance. All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. It is common practice to use pounds to represent both mass (lbm) and force (lbf); using scales that record lbm or density in lbm/ft³ is not regarded as non-conformance with this standard.
| 🟦 Parameter | 📏 SI Units | 🎯 Inch-Pound Units |
|---|---|---|
| Specimen Diameter | 100 mm | 4 in. |
| Specimen Height | 65 mm | 2.5 in. |
| Unit System Basis | Absolute System | Gravitational System |
| Force Unit (Standard) | N/A (or kg·m/s²) | lbf (pound-force) |
| Mass Unit (Common Use) | kg | lbm (pound-mass) |
| Significant Digits | Conform to Practice D6026 | |
⚡ Significant Digits and Professional Oversight: The standard highlights that the procedures for data calculation and rounding are industry standards. The standard does not consider material variation, special purpose studies, or user objectives for significant digits. Adjusting digits based on engineering judgment is common practice, but analysis methods for engineering design are beyond the scope of this standard.
⚠️ Critical System Combination Warning: Per Section 1.3, the values stated in each system may not be exact equivalents. Each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
❓ Frequently Asked Questions
🔍 What are the exact dimensions of a standard test specimen?
Per the scope of D4223/D4223M, the standard test specimen is a cylinder with a diameter of 100 mm [4 in.] and a height of 65 mm [2.5 in.].
📌 What types of asphalt binders does this standard cover?
This standard specifically covers the selection and proportioning of soils with emulsified asphalts or cutback asphalts for the fabrication of test specimens.
⚡ Is it acceptable to use pound-mass (lbm) in calculations?
Yes. While the standard technically uses the gravitational system (where the pound is a unit of force), the use of balances or scales recording pounds of mass (lbm) or density in lbm/ft³ shall not be regarded as nonconformance with this standard.
📏 Which standard governs the rounding of significant digits?
All observed and calculated values must conform to the guidelines for significant digits and rounding established in Practice D6026.
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.