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The HM-375R Relative Compaction Test Set is used for laboratory determination of the maximum wet density of soils and aggregates by the California 216 Impact method. Relative compaction is the ratio of in-place wet density to test maximum wet density of the same soil or aggregate. In-place wet density is determined in the field using sand volume cone, volumetric, or other field soil density apparatus.
A 10lb (4.54kg) tamper is dropped from 18in (457mm) to compact samples to about 10—12in (254—305mm) high in a 36in (914mm) long, 2-7/8in (73mm) diameter split mold. The special steel mold has a removable base and three hinged clamps with quick-release knobs for easy sample removal. Also included in the set are a metal leveling piston and a piston handling rod. Density is easily determined after compaction, based on a reading from the graduated scale on the shaft of the tamper. HM-375R is designed for manual compaction only.
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