this report describes an investigation into the performance of a caterpillar 815 17-mg self-propelled tamping roller in the compaction of a heavy clay, a sandy clay, a well-graded sand, a gravel-sand-clay and a uniformly graded fine sand. the results show that a satisfactory state of compaction is likely to be achieved after 4 to 7 passes on 250 mm-thick compacted layers of the cohesive soils and the uniformly graded fine sand. with the well-graded granular soils the machine is likely to require about 12 passes to achieve a satisfactory state of compaction with 150 mm-thick compacted layers. additional tests indicated that output of compacted soil is likely to increase with increase with increase in speed of travel or with decrease in thickness of layer. (a)

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