Validation of the vibrating hammer for soil compaction control

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dc.contributor.advisor Dr. George Fanourakis en_US
dc.contributor.author Lange, Desmond Peter
dc.date.accessioned 2012-02-06T06:41:28Z
dc.date.available 2012-02-06T06:41:28Z
dc.date.issued 2012-02-06
dc.date.submitted 2005
dc.identifier.uri http://hdl.handle.net/10210/4332
dc.description M.Tech. en_US
dc.description.abstract There is a general lack of understanding of the laboratory compaction test based on the vibrating hammer method. The impact method of testing soil in the laboratory is conservatively used by engineers for design and construction control purposes even when the specified mode of compaction on site is vibratory. Furthermore, the effects of vibratory compaction are not fully understood, and hence this mode of compaction in the field has not always been effectively utilized. The objective of this research project was to determine whether the vibrating hammer method could be used in the laboratory for design and control purposes, through an investigation of its operating characteristics, and a comparison of its effectiveness against that of the impact method, following a study of the compaction properties of a range of different soils used in road and embankment construction. The results of the study showed that the vibrating hammer can be used in place of impact in the laboratory for non-cohesive soils and gravels. In one instance, vibratory compaction produced maximum dry densities for a decomposed granite which were almost 5 % higher than that for impact compaction. Cohesive soils reached maximum compaction at moisture contents which were 7 % wetter under the vibratory mode as opposed to those for impact, but at lower densities. This showed that field densities under vibratory compaction would be difficult to achieve when the laboratory control method was based on impact. The research showed that electrical power input to the vibrating hammer must be carefully regulated in order to maintain specified standards which are based on a fixed frequency. Further study based on operation at different frequencies would be required to determine whether the vibrating hammer would be suitable for cohesive soils having natural frequencies lower than the current standard specified. en_US
dc.language.iso en en_US
dc.subject Soil compaction en_US
dc.subject Soil stabilization en_US
dc.subject Vibratory compacting en_US
dc.title Validation of the vibrating hammer for soil compaction control en_US
dc.type Thesis en_US

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