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D1558-10 – Standard Test Method Technical Guide
📐 Scope and Application
This test method, ASTM D1558-10, establishes the moisture-penetration resistance relationships of fine-grained soils as determined by a soil penetrometer. The values are reported in inch-pound units, with SI units in parentheses for reference. All results must comply with Practice D6026 for significant digits and rounding. The method is intended for use with Methods A and B of Test Methods D698 or D1557 to correlate moisture content, density, and penetration resistance for rapid field testing.
⚙️ Test Apparatus and Compactive Efforts
The required apparatus is the moisture-density apparatus specified in Test Methods D698. This standard incorporates two well-known compactive efforts from D698 and D1557 for developing moisture-density curves:
| 🟦 Effort Level | 📏 Energy (ft‑lbf/ft³) | 🎯 Energy (kN‑m/m³) |
|---|---|---|
| Standard (D698) | 12,400 | 600 |
| Modified (D1557) | 56,000 | 2,700 |
All testing agencies should meet the criteria of Practice D3740 for competent and objective results.
📊 Penetration Resistance Relationships
Per Terminology D653, the penetration resistance curve (Proctor penetration curve) defines the relationship between penetration resistance and water content. The test method uses prepared families of moisture-penetration curves with D698 or D1557 curves to estimate moisture content and compaction in the field. Penetration resistance values are not reliable for very dry molded specimens or highly granular soils.
💡 Tip: For a field compaction check, compare penetration resistance at a known moisture content with penetration-density curves from the specified compactive effort.
⚠️ Warning: Avoid testing very dry or granular materials; results are unreliable for such soils.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D1558?
It establishes moisture-penetration resistance relationships for fine-grained soils, enabling rapid field estimation of moisture content and compaction density.
💡 How does this method integrate with other ASTM standards?
It is used alongside Methods A and B of D698 or D1557 to develop relationships between moisture content, density, and penetration resistance.
⚡ When are penetration resistance determinations unreliable?
For very dry molded specimens and granular soils, penetration resistance results are not reliable.
📌 What equipment is required for this test?
A moisture-density apparatus conforming to Test Methods D698 is essential for the procedure.