While the standard was withdrawn by ASTM in 2016, it remains one of the most widely cited and utilized methods in the industry. It has largely been replaced in practice by ASTM D6913 (for sieves) and ASTM D7928 (for hydrometer), but you will still see "D422" on countless project specifications and older reports. Understanding the methodology is still essential.
After the lab work is done, the data is plotted on a . This graph plots particle size on a logarithmic X-axis and the percentage passing (finer by weight) on the Y-axis. astm d422
Next time you look at a boring log and see "SW-SM" (Well-graded sand with silt), remember: that classification started with a sieve, a shaker, and the methodical process of ASTM D422. While the standard was withdrawn by ASTM in
To prevent fine particles from clumping together (flocculation), a dispersing agent like sodium hexametaphosphate (SHMP) is added to the soil-water suspension. After the lab work is done, the data is plotted on a
In simple terms, this test tells you the percentages of gravel, sand, silt, and clay present in a specific soil sample. This data is used to classify the soil (using standards like the Unified Soil Classification System, or USCS) and to estimate engineering properties like permeability, frost susceptibility, and shear strength.
Engineers calculate the percentage of total mass retained on each sieve to determine the "cumulative percentage finer" than each size. Hydrometer Analysis