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D1452 – Standard Test Method Technical Guide
ASTM D1452/D1452M-24 provides standardized guidance for soil exploration and sampling using earth augers at shallow depths. This practice is essential for obtaining disturbed soil samples that are fundamental for classification and compaction testing in geotechnical engineering.
📐 Scope and General Requirements
The scope of this standard includes equipment and procedures for earth auger borings, specifically excluding hollow-stem augers which are covered in Practice D6151/D6151M. Samples obtained are classified as Group A or B per D4220/D4220M, and are suitable for tests such as classification (D2487, D2488) and compaction (D698, D1557). The standard emphasizes that these samples are disturbed, and for intact samples, alternative methods like thin-walled tube sampling with fluid rotary drilling should be considered.
Units are provided in both inch-pound and SI formats, which must be used independently without combining. All values must adhere to the rounding guidelines of Practice D6026. Users are responsible for safety and regulatory compliance.
⚠️ Sample Quality Warning: Samples from this practice are disturbed and not suitable for intact strength or consolidation testing. Use thin-walled tube sampling when undisturbed samples are required.
⚙️ Equipment and Boring Procedures
The practice outlines the use of earth augers such as hand augers, bucket augers, or continuous flight augers for shallow penetration. Boring procedures must ensure minimal disturbance to the soil structure for classification purposes. Proper handling and preservation of samples per D4220/D4220M are critical. The following table summarizes key referenced standards that support this practice.
| 📏 Standard | 📐 Title | 🎯 Purpose |
|---|---|---|
| D2487 | Classification of Soils for Engineering Purposes | Unified Soil Classification System for sample identification |
| D4220/D4220M | Preservation and Transportation of Soil Samples | Guidelines for Group A and B sample handling |
| D6151/D6151M | Hollow-Stem Auger Drilling | Method for obtaining intact samples if needed |
| D6026 | Significant Digits in Geotechnical Data | Rounding and precision requirements |
📊 Sample Types and Applications
Samples recovered under this standard are considered disturbed, making them ideal for bulk sample applications. They are commonly used for determining moisture-density relationships (D698, D1557), soil classification, and index properties. For projects requiring undisturbed samples, the standard directs users to thin-walled tube sampling (D1587/D1587M) or hollow-stem auger methods (D6151/D6151M).
💡 Application Tip: Use this practice for shallow geotechnical surveys, borrow source investigations, and layer identification. Combine with standard penetration test (D1586/D1586M) for in-situ strength estimates.
❓ Frequently Asked Questions
🔍 What soil types can be explored with this practice?
This practice is suitable for most soil types that can be penetrated by hand or mechanical augers, including sand, silt, clay, and gravel. It is not intended for hard rock or frozen ground.
💡 Are samples from this practice suitable for shear strength tests?
No, the samples are disturbed and cannot be used for intact properties like shear strength or consolidation. Disturbed samples are limited to classification and compaction tests.
⚡ How does this standard differ from D6151/D6151M?
D1452/D1452M focuses on earth augers and disturbed samples, while D6151/D6151M covers hollow-stem augers which can retrieve intact samples for advanced testing.
📌 What unit system should I use for reporting?
Either inch-pound or SI units can be used, but they must be applied independently. Do not mix units, as this may lead to non-conformance with the standard.