oa Civil Engineering = Siviele Ingenieurswese - The results of some static and repetitive consolidation tests and their significance on road design

Volume 10, Issue 1
  • ISSN : 1021-2000



Consolidation tests, under repetitive and static loads, were conducted on samples of a sandy silt. The soil was compacted to densities varying from 70 to 95 per cent of the modified A.A.S.H.O. maximum dry density of 115 Ib/cu. ft. The moulding moisture content varied from 137 to 177 per cent. From the e-Iog P curves drawn for identical samples, it is observed that the sample subjected to a repetitive load is consolidated only slightly more than that subjected to a static load. This applies to saturated samples as well as to samples tested at placement moisture content. It appears that a sample subjected to repetitive load reaches over 85 per cent of its final value of consolidation at about 50,000 repetitions of load. More than 50 per cent of the consolidation takes place before 1,000 load repetitions. The soil tested was relatively incompressible at placement moisture content for the range of densities used. At saturation, however, there is an increase of consolidation. This additional settlement or collapse on saturation has approximately the same magnitude under repetitive and static loads. It appears that the collapse is dependent on the initial dry density, the moulding moisture content and the magnitude of applied load.

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