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D2844 – Standard Test Method Technical Guide
📐 Scope and Significance
This test method, designated D2844/D2844M-18, covers the procedure for testing both treated and untreated laboratory compacted soils or aggregates using the stabilometer and expansion pressure devices. The results are indicative of performance when these materials are placed in the base, subbase, or subgrade of a road subjected to traffic. The standard includes editorial updates, such as the correction of adjunct stock numbers in December 2022.
⚙️ Test Procedure and Equipment
The test employs stabilometers and expansion pressure devices, which are often manufactured to be readable in inch-pound units only. All observed and calculated values must conform to the guidelines for significant digits and rounding established in Practice D6026. The procedures outlined represent the industry standard for data collection and calculation, though they do not account for material variation or specific study objectives. Users are responsible for establishing appropriate safety and regulatory practices.
📊 Key Measured Properties
The primary measurements obtained from this test are the Resistance R-Value and Expansion Pressure of compacted soils. These properties are critical for assessing the performance of soils in road construction. The values are reported in either SI units or inch-pound units, each system being used independently to avoid non-conformance.
| 🟦 Standard | 📏 Title |
|---|---|
| ASTM C670 | Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials |
| ASTM D653 | Terminology Relating to Soil, Rock, and Contained Fluids |
| ASTM D3740 | Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction |
| ASTM D6026 | Practice for Using Significant Digits and Data Records in Geotechnical Data |
| ASTM E4 | Practices for Force Calibration and Verification of Testing Machines |
| ASTM E11 | Specification for Woven Wire Test Sieve Cloth and Test Sieves |
| AASHTO T 190 | Test Method for Resistance R-Value and Expansion Pressure of Compacted Soils |
| 📐 Unit System | 🎯 Description | ⚡ Usage Requirement |
|---|---|---|
| SI Units | Values in SI units | Regarded as standard; use independently |
| Inch-Pound Units | Values in inch-pound units (in brackets) | Regarded as standard; use independently |
| Combined Use | Combining SI and inch-pound values | May result in non-conformance; avoid combining |
💡 Tip: Equipment designed to be readable in inch-pound units only is acceptable and should not be considered non-conformance. Always use the selected unit system consistently throughout the test.
⚠️ Caution: All observed and calculated values must be rounded to the nearest decimal or significant digits as per Practice D6026. The standard procedures are for industry consistency, but users must consider material variation and study objectives for data reporting.
❓ Frequently Asked Questions
🔍 What is the scope of test method D2844?
The test method covers procedures for testing both treated and untreated laboratory compacted soils or aggregates with stabilometer and expansion pressure devices. The results indicate performance when placed in the base, subbase, or subgrade of a road subjected to traffic.
💡 How should units be handled in this standard?
Values stated in SI units and inch-pound units are separately standard. They may not be exact equivalents, so each system must be used independently. Combining values from both systems may result in non-conformance.
⚡ Why are significant digits important in this test method?
All observed and calculated values must conform to the guidelines for significant digits and rounding in Practice D6026. This ensures consistency and accuracy when comparing measured or calculated values with specified limits.
📌 Which documents are referenced in this standard?
Referenced documents include ASTM practices such as C670, D653, D3740, D6026, E4, E11, and the AASHTO T 190 test method.