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Nuclear moisture-density apparatus for rapid determination of the unit weight and water content of compacted soil layers. |
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Hyster C440A Embankment Compactor |
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A “sheepsfoot” on a roller drum. Sheepsfoot type rollers are useful for compacting a soil layer from the bottom up. |
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Tamping feet on a roller that act in much the same way as the feet on a sheepsfoot roller. |
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Tamping feet on a roller that act in much the same way as the feet on a sheepsfoot roller. |
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Smooth-drum vibratory roller |
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Sheepsfoot drum on a Caterpiller 825B roller. |
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Small vibratory drum roller (Rayco Rascal 320A) |
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Dynapac vibratory drum roller with dozer attachment. |
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Hyster C452B embankment compactor. |
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Caterpiller 825B with segmented ring sheepsfoot tamping pads. The supporting soil is at high density and strength so the feet do not penetrate the surface. |
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Segmented wheel compactor at work on an earth fill in California. |
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Rex 3-50 open ring segmented pad roller. |
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Sheepsfeet are partially penetrating and compacting the fill from the bottom up. With successive passes the roller will “walk out” of the soil and ride on the top of the lift. If the water content is significantly wet of optimum, the feet will continue to penetrate on successive passes and little densification will be achieved. |
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Towed compactor drum at work on a highway project. |
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Heavy embankment compactor with open ring wheels and sheepsfeet. The roller has “walked out” of the soil being compacted. |
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Close up of open wheel sheepsfoot roller. |
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Heavy rubber tired roller at work on the Mt. St. Helens sediment retention dam. The boxes above the wheels can be filled with water or other ballast to increase the roller weight. |
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Compaction of the Mt. St. Helens sediment retention dam core. |
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Overview of the core compaction at the Mt. St. Helens sediment retention dam. |
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Why vibratory rollers are effective on cohesionless soils. |
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Why a vibratory roller vibrates. |
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How a vibratory roller works. |
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This Rayco Rascal 320A vibratory roller produces 16K dynamic force. |
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This Dynapac 25PD generates a 47,375 lb dynamic force at 1700 vibrations per minute. |
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Vibratory steel drum roller. |
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Vibratory compaction of a road base in New York State. |
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Offset drums enable compaction of a wider strip. |
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Wacker vibratory hand compactor for use in small and/or confined spaces. |
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Wacker hand compactor at work on a trench backfill. |
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Determining the as-compacted unit weight and water content during construction of the Briones Dam in California. |
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Dynapac vibratory pad drum roller. |
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Vibratory sled compactor used during construction of the Franklin Falls Dam in New Hampshire in the mid 1930’s. |
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Nuclear moisture density measuring apparatus. |
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