Pdf [best] - Astm D4546-21

is the official designation for the Standard Test Methods for One-Dimensional Swell or Collapse of Soils . It was approved by the American Society for Testing and Materials (ASTM) in February 2021, superseding previous versions (D4546-14, D4546-08, etc.).

The apparatus and equipment required to perform the tests described in ASTM D4546-21 include:

As ASTM standards are copyrighted intellectual property, the full PDF is not typically available for free. You can obtain the official document through the following authorized channels: Astm D4546-21 Pdf

ASTM D4546-21 details three distinct procedures designed for different soil conditions and testing objectives: 1. Test Method A: Reconstituted Specimens (Compacted Fills)

is the definitive active international standard used by geotechnical engineers to evaluate how unsaturated soils respond to wetting and structural loading. Formally titled "Standard Test Methods for One-Dimensional Swell or Collapse of Soils," this document outlines the exact laboratory processes required to measure soil volume instability. These measurements prevent catastrophic foundation failures caused by expansive or collapsible ground conditions. is the official designation for the Standard Test

between ASTM D4546 and ASTM D4546-14 .

Test Method B is designed for soil samples. These are core samples obtained directly from a natural deposit (like an existing clay layer) or an existing compacted fill . You can obtain the official document through the

: The structural settlement or decrease in soil height caused by wetting, even under a constant vertical load. This is common in loose, unsaturated wind-blown sands (loess) or poorly compacted artificial fills.

% Swell/Collapse=(ΔHH0)×100% Swell/Collapse equals open paren the fraction with numerator cap delta cap H and denominator cap H sub 0 end-fraction close paren cross 100 Swell Index ( Cscap C sub s

The test procedure for ASTM D4546-21 involves the following steps: