Proctor Compaction Test Equipment

Proctor Compaction test equipment from Karol-Warner features our Soil Density Molds, which are manufactured to ASTM and AASHTO standards, and Sample Ejectors to easily remove compacted soil samples from the molds.

Proctor Compaction testing dates back to the early 1930s when University of California, Berkeley student Ralph R. Proctor first developed a method for evaluating maximum soil density. The test has changed slightly over the years but is still the most widely recognized method for determining the relationship between water content and the dry unit weight of soil used in construction.

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• Soil Density Molds (Proctor Compaction Molds) are available in 4in (102mm) and 6in (152mm) diameters. Mold, Collar, and Base components can be purchased separately.
• Sample Ejectors are used to remove soil samples from Soil Density (Proctor Compaction) Molds, CBR Molds, and LBR Molds. Sample Ejectors are available in 4in (102mm) or 6in (152mm) models and can be adapted to extrude soil from smaller Shelby tube samplers.
• Soil Pocket Penetrometer is used in the lab or field for quick estimates of unconfined compressive strength of cohesive soils.
• Calcium Carbonate Apparatus determines the presence of calcium carbonate (CaCO3) in soils and soft rock by using the gasometric method.