These tests are critical for:
A highway project crossed a dry alluvial fan. Collapse tests per ASTM D4546-21 Method C showed 12% collapse upon wetting. The engineers treated the soil with deep dynamic compaction before paving. Ten years later, a flood event caused zero settlement on the treated section. An adjacent untreated section sank 18 inches. Astm D4546-21 Pdf
The standard now specifies exactly which porous stones to use (medium porosity, fine porosity) depending on whether you are testing clay or silty sand to prevent soil migration into the drainage lines. These tests are critical for: A highway project
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