Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D4867 – Standard Test Method Technical Guide
ASTM D4867/D4867M – 22´1 provides a standardized laboratory procedure to determine the susceptibility of compacted asphalt mixtures to moisture damage. By comparing the tensile strength of dry specimens with those subjected to accelerated moisture conditioning, this test method quantifies the retained strength of the paving mixture, a critical parameter for long-term pavement performance.
📐 Specimen Preparation and Geometric Requirements
This test method is specifically applicable to dense-graded mixtures conforming to the composition requirements of Specification D3515. Sampling of the asphalt mixture is performed in accordance with Practice D979/D979M, using random sampling techniques from Practice D3665 to ensure representative test specimens.
Specimens are compacted to a target air void level, as determined by Test Method D3203. The density characteristics are established using the theoretical maximum specific gravity (Test Method D2041/D2041M) and the bulk specific gravity (Test Method D2726/D2726M). The physical dimensions of each specimen are measured following Test Method D3549/D3549M.
⚠️ Unit System Compliance: Per Section 1.2 of the standard, values stated in SI units or inch-pound units shall be regarded separately as standard. Each system must be used independently of the other without combining values in any way.
⚙️ Test Procedure and Moisture Conditioning
The test method establishes two distinct testing subsets. The “dry” subset is tested without moisture exposure. The “conditioned” subset undergoes a rigorous moisture treatment to evaluate the effect of water on the asphalt-aggregate bond. The standard explicitly allows for the evaluation of antistripping additives, including liquid anti-strips and pulverulent solids such as hydrated lime or portland cement, by incorporating them into the mixture during preparation.
📊 Key Measured Properties and Interpretation
The primary measured property is the tensile strength of the specimens. The key result is the Tensile Strength Ratio (TSR), calculated by comparing the average tensile strength of the moisture-conditioned subset to the average tensile strength of the dry subset. This ratio provides a direct performance measure of the mixture’s resistance to moisture damage.
| 🟦 Referenced Standard | 📏 Purpose in D4867/D4867M |
|---|---|
| D2041/D2041M | Theoretical Maximum Specific Gravity of the loose mixture |
| D2726/D2726M | Bulk Specific Gravity of compacted specimens |
| D3203 | Calculation of Percent Air Voids in compacted specimens |
| D3549/D3549M | Measurement of Specimen Thickness or Height |
| D3665 | Random Sampling of the asphalt mixture |
💡 Additive Compatibility: As outlined in Section 1.1, this test method can be used to evaluate the effect of moisture with or without antistripping additives including liquids and pulverulent solids such as hydrated lime or portland cement. Thorough blending of the additive is essential.
❓ Frequently Asked Questions
🔍 What is the primary scope of ASTM D4867?
This standard covers procedures for preparing and testing laboratory-compacted asphalt mixture specimens to measure the effect of water on the tensile strength of the paving mixture, as stated in Section 1.1.
💡 What types of mixtures and additives does this standard apply to?
It is applicable to dense mixtures (e.g., those in Specification D3515) and can evaluate mixtures with or without antistripping additives, including liquids, hydrated lime, or portland cement.
⚡ Are there critical unit system precautions I should be aware of?
Yes. Per Section 1.2, the SI units and inch-pound units are separate standards. You must use one system consistently without combining values from the other system.
📌 Which standard governs the calculation of air voids for this test?
Percent air voids in the compacted asphalt mixture specimens are determined following Test Method D3203.