For geotechnical engineers and laboratory technicians, determining the shear strength of cohesive soils is a fundamental task. The go-to standard for this—particularly for soils that do not require complex confinement—is ASTM D2166 . Whether you are reviewing a report or setting up a lab test, having a clear grasp of this standard is critical.
Understanding ASTM D2166: The Standard for Unconfined Compression Strength of Cohesive Soil (PDF Overview) astm d2166 pdf
ASTM D2166 is a cornerstone of geotechnical lab testing. While the unconfined compression test has limitations, it remains an indispensable tool for preliminary strength assessments. For critical projects, pair it with triaxial or direct shear testing. If you are looking for the official ,
If you are looking for the official , it is available for purchase directly from ASTM International. Below is a breakdown of what the standard covers and why it matters. For geotechnical engineers and laboratory technicians