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D3213-19 – Standard Test Method Technical Guide
ASTM D3213-19 establishes standard practices for the handling, storing, and preparing of soft intact marine soil for geotechnical laboratory testing. These practices are essential for preserving the natural structure of soft cohesive soils and ensuring reliable results from triaxial strength and consolidation tests. The standard also covers project reporting, transportation, and safety considerations for contaminated samples.
📦 Handling and Storing Soft Intact Marine Soil
Soft marine soils are highly susceptible to disturbance, which can compromise test accuracy. ASTM D3213-19 outlines methods to minimize disturbance during handling, transportation, and storage, referencing Practices D4220/D4220M for preserving and transporting soil samples. X-ray radiography per Practice D4452 is recommended to assess sample integrity. For contaminated samples, the standard provides specific procedures for hazardous materials and samples subject to quarantine regulations, with safety addressed in Sections 1, 2, and 7.
🔬 Preparing Specimens for Triaxial and Consolidation Testing
The standard details procedures for preparing soft intact marine soil specimens for strength and consolidation tests. Specimens are typically obtained using thin-walled tube samplers per D1587/D1587M. For triaxial strength testing, Test Method D2850 is referenced for unconsolidated-undrained conditions. Consolidation testing utilizes Test Methods D2435/D2435M for incremental loading or D4186/D4186M for controlled-strain loading. Proper trimming and mounting techniques are emphasized to maintain in-situ stress states and void ratios.
📊 Key Quality Assurance and Referenced Standards
ASTM D3213-19 integrates several ASTM standards to ensure comprehensive practices. Quality assurance for testing agencies is guided by D3740. The following table lists key referenced standards from the standard.
| 🟦 Designation | 📐 Title |
|---|---|
| D653 | Terminology Relating to Soil, Rock, and Contained Fluids |
| D1587/D1587M | Practice for Thin-Walled Tube Sampling of Fine-Grained Soils |
| D2435/D2435M | Test Methods for One-Dimensional Consolidation Properties of Soils |
| D2850 | Test Method for Unconsolidated-Undrained Triaxial Compression Test on Cohesive Soils |
| D3740 | Minimum Requirements for Agencies Engaged in Testing and/or Inspection |
| D4186/D4186M | One-Dimensional Consolidation with Controlled-Strain Loading |
| D4452 | Practice for X-Ray Radiography of Soil Samples |
| D4648/D4648M | Laboratory Miniature Vane Shear Test for Saturated Clayey Soil |
| D8121/D8121M | Shear Strength by Handheld Vane Shear Device |
💡 Tip: Always consult D3740 for minimum requirements when engaging testing agencies. Professional judgment is crucial for adapting these practices to specific project conditions, as noted in Section 1.4.
⚡ Warning: Handle contaminated samples with caution. ASTM D3213-19 includes precautionary statements regarding hazardous materials and quarantine regulations. Review Sections 1, 2, and 7 thoroughly.
❓ Frequently Asked Questions
🔍 What types of soil does ASTM D3213-19 cover?
The standard applies to soft cohesive intact marine soils, specifically very soft and soft fine-grained sediments.
💡 How does the standard ensure sample quality?
It references practices like D4220/D4220M for preservation and transportation, and D4452 for X-ray radiography to assess sample disturbance.
⚡ What are the key testing methods for strength and consolidation?
Triaxial strength is tested per D2850, and consolidation per D2435/D2435M or D4186/D4186M, with specimen preparation guided by these practices.
📌 Why is safety emphasized in this standard?
Due to the potential presence of hazardous materials in marine sediments, the standard includes specific safety concerns in Sections 1, 2, and 7, and references quarantine regulations.