While ASTM D3385-18 provides a valuable tool for evaluating geotextiles, there are challenges and limitations, including variability in testing results and the influence of test conditions on the measured pore size distribution. Additionally, field performance can sometimes differ from laboratory results due to installation conditions, soil properties, and long-term degradation.
Today, D3385-18 is still the go-to field method. It’s not glamorous. It involves buckets, stopwatches, and a lot of waiting. But it tells a simple truth about the ground beneath our feet: how fast it drinks water. And that truth underpins safe foundations, clean water, and sustainable land use. astm d338518 pdf
Understanding ASTM D3385-18: The Standard Test Method for Infiltration Rate of Soils Using Double-Ring Infiltrometer While ASTM D3385-18 provides a valuable tool for
Very plastic (fat) clays or highly compacted soils where ring driving causes severe fracturing. It’s not glamorous
The infiltration rate computed for a specific, short time interval during the test.
The "double-ring" design is critical for accuracy because it forces water in the inner ring to flow . The outer ring acts as a buffer, saturating the surrounding soil to prevent lateral (sideways) spreading from the inner measurement area. Requirement under ASTM D3385-18 Method Constant Head Method (water level is kept steady) Ring Depth Driven typically to 150 mm (6 inches) Measurement