ASTM D6528-24 PDF
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St ASTM D6528-24
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Ст ASTM D6528-24
Original standard ASTM D6528-24 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Consolidated Undrained Direct Simple Shear Testing of Fine‑Grained Soils (ASTM D6528‑24). This test method specifies equipment and procedures to measure constant‑volume (undrained) shear strength and stress–strain behavior of fine‑grained/cohesive soils using a direct simple shear apparatus on rectangular or cylindrical specimens.
Abstract
ASTM D6528‑24 describes consolidated, constant‑volume direct simple shear (DSS) testing to evaluate undrained shear strength and stress–strain response of intact, reconstituted or compacted fine‑grained soils after one‑dimensional consolidation. The method is intended for specimens tested under plane strain conditions with continuous shear deformation and emphasizes SI units, reporting conventions, and links to related consolidation test methods. The standard also cautions about the non‑uniform state of stress in DSS specimens and provides guidance on comparability with consolidation tests such as Test Methods D2435/D2435M.
General information
- Status: Active (current ASTM standard, edition 2024).
- Publication date: July 1, 2024 (D6528‑24).
- Publisher: ASTM International.
- ICS / categories: 13.080.20 — Physical properties of soils.
- Edition / version: D6528‑24 (2024 revision of the D6528 series).
- Number of pages: 10.
Scope
This test method defines equipment specifications and step‑by‑step procedures for measuring constant‑volume (equivalent to undrained for saturated specimens) strength and stress–strain characteristics of fine‑grained soils following one‑dimensional consolidation, using a constant rate of simple shear deformation. It is written for devices that test rectangular parallelepiped or cylindrical specimens; other devices that produce equivalent consolidated constant‑volume simple shear results are outside the scope. Reporting in SI units is specified and significant‑digit rules refer to Practice D6026.
Key topics and requirements
- Specification of apparatus and specimen geometry for direct simple shear testing.
- One‑dimensional consolidation procedure prior to constant‑volume shear and guidance on selecting vertical consolidation stress.
- Constant‑rate simple shear deformation under constant volume (undrained) conditions and measurement of shear strength and stress‑strain response.
- Comparability notes with consolidation Test Methods D2435/D2435M (consolidation behavior and preconsolidation stress estimates).
- Units and reporting: SI units as standard; guidance on inch‑pound conversions and significant digits per Practice D6026.
- Limitations and interpretation cautions — DSS stress state is not fully uniform; engineering interpretation should account for this.
Typical use and users
Used by geotechnical laboratories, consulting geotechnical and civil engineers, academic researchers in soil mechanics, and construction quality/verification teams to determine undrained shear strength parameters for clays and other fine‑grained soils. Typical applications include stability analyses beneath embankments, pile‑load zone characterization, and research comparing consolidation and undrained strength behavior.
Related standards
Directly references and compares results with ASTM Test Methods D2435/D2435M (one‑dimensional consolidation), and refers to Practice D6026 for significant‑digit and rounding conventions. The 2024 revision replaces earlier editions such as D6528‑17. Other commonly used complementary soil standards include D4318 (Atterberg limits) and D6913 (particle‑size analysis) for sample characterization.
Keywords
consolidated undrained test, direct simple shear, constant volume, fine‑grained soils, clays, shear strength, stress‑strain, consolidation, undrained shear tests, specimen preparation, SI units.
FAQ
Q: What is this standard?
A: ASTM D6528‑24 is the 2024 ASTM test method for consolidated undrained direct simple shear testing of fine‑grained (cohesive) soils; it defines apparatus and procedures for constant‑volume shear tests used to measure undrained shear strength and stress‑strain behavior.
Q: What does it cover?
A: It covers equipment specifications, specimen types (rectangular or cylindrical), consolidation prior to shear, constant‑rate simple shear under constant volume (undrained) conditions, reporting conventions (SI units), and cautions on interpreting results due to non‑uniform stress states.
Q: Who typically uses it?
A: Geotechnical testing laboratories, consulting and design geotechnical engineers, researchers in soil mechanics, and QA/QC personnel involved in foundations, earthworks, and slope stability projects.
Q: Is it current or superseded?
A: Current — D6528‑24 is the 2024 revision and supersedes earlier editions (for example D6528‑17). The ASTM store lists D6528‑24 as the active version.
Q: Is it part of a series?
A: Yes — it is part of the ASTM soil testing family (Book of Standards Vol. 04.09) and relates to other ASTM consolidation and soil characterization standards (e.g., D2435/D2435M, D6026, D4318).
Q: What are the key keywords?
A: consolidated undrained, direct simple shear, constant volume, shear strength, fine‑grained soils, clays, consolidation, stress‑strain.