This report describes an investigation into the performance of a Vibras 85/10 CP 1700-kg (1 3/4 ton) double-vibrating 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 investigation comprised a study of the effect of the number of passes of the double-vibrating roller on the state of compaction produced, using a depth of layer that the machine was considered capable of compacting satisfactorily. In addition, relations between dry density and moisture content were calculated, based on the results of this investigation and upon past experience with other compaction equipment. The results show that the machine would be unsuitable for use on heavy clay, but in general, a satisfactory state of compaction would be achieved after 4 passes on 10-cm (4-in) thick compacted layers of light cohesive soils and uniformly graded materials and 12.5-cm (5-in) thick compacted layers of well-graded granular soils. The machine is likely to be capable of compacting, to a state satisfactory for earthwork construction, about 15 m3 /h (20 yd3 /h) of light cohesive soils and uniformly graded materials, and 19m3 /h (25 yd3 /h) of well-graded granular soils. These results were achieved using the low travelling gear, but tests with well-graded sand indicated that a higher output might be expected with well-graded granular soils when using the high travelling gear. (Author/publisher)
Abstract