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D2937-24 – Standard Test Method Technical Guide
📐 Scope and Limitations
The D2937-24 test method determines in-place density of soil near the surface by driving a thin-walled cylinder into the soil. This method is not recommended for organic or friable soils that may compress during sampling. Soils with particles larger than 5 mm (3/16 in.) can damage equipment or cause invalid results due to voids or dislodged particles.
⚙️ Unit Systems and Reporting
SI units are standard; inch-pound units are informational. The standard uses the gravitational system for inch-pound units where pound (lbf) represents force. Reported values must conform to significant digit guidelines from Practice D6026.
📊 Key Considerations for Testing
For testing at depth, practices D1587/D1587M or D6519/D6519M are recommended. This method focuses on density and water content from intact samples; other properties are beyond scope. Avoid soft, saturated, or highly plastic soils that may deform or not be retained in the cylinder.
| 🟦 📏 📐 🎯 ⚡ Soil Type | 🔍 Suitability | 📌 Particle Size Issue |
|---|---|---|
| Organic Soils | Not recommended | Compress during sampling |
| Friable Soils | Not recommended | May not be retained |
| Soils with particles >5 mm | Potential damage | Invalid results likely |
| Cohesive Soils | Suitable | No large particles |
⚠️ Warning: Avoid using this method for soils with particles larger than 5 mm (3/16 in.) to prevent equipment damage and ensure accurate density measurements.
💡 Tip: When reporting in inch-pound units, adhere to the gravitational system where pound (lbf) represents force. SI units are always preferred for consistency.
❓ Frequently Asked Questions
🔍 What is the primary purpose of D2937-24?
To determine in-place density of soil near the surface using a drive-cylinder method, with intact samples for density and water content calculations.
💡 Can this method be used for gravelly soils?
No, soils with particles larger than 5 mm (3/16 in.) are not suitable due to risk of equipment damage and measurement inaccuracies.
⚡ What unit system is standard?
SI units are regarded as standard. Inch-pound units are informational but must use the gravitational system for force representation.
📌 Are there alternatives for deeper tests?
Yes, Practices D1587/D1587M or D6519/D6519M are recommended for in-place density determination at depth.