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In China, the standard can be accessed through:
Multiple specimens tested to plot percent swell vs. vertical load.
ASTM D4546-21 establishes laboratory test methods (A, B, and C) to determine the one-dimensional swell or collapse of soils, crucial for assessing foundation stability. This updated standard focuses on measuring free swell, swell pressure, and hydrocompression to predict soil behavior under moisture changes. To access the full standard document, visit ASTM International .
Occurs in loosely deposited, low-density unsaturated soils (such as loess, arid alluvial soils, or poorly compacted engineered fills). These soils feature a weak, temporary bonding structure held together by dry clay bridges or soluble minerals like gypsum. When water passes through, these bonds dissolve, causing the soil matrix to rapidly collapse inward under its own weight or structural loads.
| Edition | Key Changes | |---------|-------------| | | Initially titled "Standard Test Methods for One-Dimensional Swell or Settlement Potential of Cohesive Soils" | | 2008 edition | Expanded scope; three alternative methods for measuring free swell, swell pressure, and swell or collapse magnitude | | 2014 edition | Refined procedures for reconstituted and intact specimens | | 2021 edition | Current version (April 2021). Introduces clearer distinction between Methods A, B, and C; updates reference standards and editorial improvements |
ASTM D4546-21 remains a cornerstone standard in forensic geotechnical engineering and routine site investigations. By choosing the appropriate method (A, B, or C), engineers obtain repeatable, defensible empirical data regarding how cohesive soils behave when hydrated. Utilizing the updated 2021 guidelines ensures that laboratory testing satisfies modern quality assurance criteria, safeguarding infrastructure against the costly effects of expansive and collapsible clays.
In China, the standard can be accessed through:
Multiple specimens tested to plot percent swell vs. vertical load.
ASTM D4546-21 establishes laboratory test methods (A, B, and C) to determine the one-dimensional swell or collapse of soils, crucial for assessing foundation stability. This updated standard focuses on measuring free swell, swell pressure, and hydrocompression to predict soil behavior under moisture changes. To access the full standard document, visit ASTM International .
Occurs in loosely deposited, low-density unsaturated soils (such as loess, arid alluvial soils, or poorly compacted engineered fills). These soils feature a weak, temporary bonding structure held together by dry clay bridges or soluble minerals like gypsum. When water passes through, these bonds dissolve, causing the soil matrix to rapidly collapse inward under its own weight or structural loads.
| Edition | Key Changes | |---------|-------------| | | Initially titled "Standard Test Methods for One-Dimensional Swell or Settlement Potential of Cohesive Soils" | | 2008 edition | Expanded scope; three alternative methods for measuring free swell, swell pressure, and swell or collapse magnitude | | 2014 edition | Refined procedures for reconstituted and intact specimens | | 2021 edition | Current version (April 2021). Introduces clearer distinction between Methods A, B, and C; updates reference standards and editorial improvements |
ASTM D4546-21 remains a cornerstone standard in forensic geotechnical engineering and routine site investigations. By choosing the appropriate method (A, B, or C), engineers obtain repeatable, defensible empirical data regarding how cohesive soils behave when hydrated. Utilizing the updated 2021 guidelines ensures that laboratory testing satisfies modern quality assurance criteria, safeguarding infrastructure against the costly effects of expansive and collapsible clays.