this report describes investigations into the performance of two models of double vibrating roller, a bomag bw 75s with a mass of 1.0 mg, and a bomag bw 200 with a mass of 7.3 mg, in the compaction of a heavy clay, a sandy clay, a well-graded sand, a gravel-sand-clay and a uniformly graded fine sand. a limited investigation into the performance of a 1.5 mg machine (bomag bw 90s) is also described. included in the investigations was the effect of operating the machines with one roll only vibrating. the results show that the 1.0 mg machine would be unsuitable for the compaction of heavy cohesive soils, but would be capable of outputs of compacted soil varying from 13 to 65m3/h with the other types of soil tested. the 1.5 mg double vibrating roller is likely to be capable of a slightly greater output than the 1.0 mg machine, but only by virtue of its increased width of roll. the 7.3 mg double vibrating roller is likely to be unsuitable for the compaction of most uniformly graded soils but, when used in low travelling gear, would be capable of outputs varying from 86 to 110 m3/h with other types of soil. the results indicated that the output of the 7.3 mg machine might be increased by the use of the second travelling gear. (a)

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