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D2488-17 – Standard Test Method Technical Guide
ASTM D2488-17 is a standard practice for the description and identification of soils using visual-manual procedures, commonly used in geotechnical engineering for field classification. It outlines methods for describing soils for engineering purposes and provides an optional identification procedure based on the classification system in Test Method D2487.
📋 Overview and Scope
This practice covers the description of soils for engineering purposes (Section 1.1). It also offers a procedure for identifying soils through visual examination and manual tests, based on the classification system in Test Method D2487 (Section 1.2). The identification is limited to naturally occurring soils with particles smaller than 3 in. (75 mm) (Section 1.2.2).
The standard specifies that inch-pound units are the standard, and SI units in parentheses are for information only (Section 1.4). It references several ASTM standards for soil sampling and exploration, including D1452, D1586, D1587, and D2113, which are essential for comprehensive soil evaluation.
⚙️ Identification and Description Procedures
The visual-manual procedures involve examining the soil and performing simple tests to assign a group symbol and name from D2487. For precise classification, D2487 procedures must be used (Section 1.2.1). The descriptive information can be applied to other classification systems or materials like shale and crushed rock (Section 1.3).
It is mandatory to state in reports that identification is based on visual-manual procedures (Section 1.2). The standard also emphasizes the use of professional judgment and does not replace education or experience (Section 1.6).
| 🟦 Sieve Designation | 📏 Opening Size (in.) | 📐 Opening Size (mm) |
|---|---|---|
| No. 4 | 0.187 | 4.75 |
| No. 10 | 0.0787 | 2.00 |
| No. 40 | 0.0165 | 0.425 |
| No. 200 | 0.0029 | 0.075 |
The sieve designations above follow the “alternative” system in accordance with Practice E11, as referenced in Section 1.4.
💡 Tip: This practice is intended for use with professional judgment. It is crucial to consider project-specific factors and not solely rely on this document for decisions (Section 1.6).
⚠️ Warning: Users must address safety, health, and environmental concerns as outlined in Section 1.5 and refer to Section 8 for specific precautionary statements before field application.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2488-17?
It provides procedures for describing soils for engineering purposes and identifying soils using visual-manual techniques, based on the classification system from Test Method D2487.
💡 How does this standard relate to D2487?
D2488-17 uses the classification framework from D2487 for soil identification, but for precise classification, D2487 should be used. D2488 relies on visual examination and manual tests.
⚡ What are the unit specifications in D2488-17?
Inch-pound units are standard; SI units provided are for information only and are not considered standard (Section 1.4).
📌 Can this practice be applied to non-natural materials?
Yes, as per Note 1, it can be used descriptively for materials like shale, claystone, shells, and crushed rock (see Appendix X2).