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Title: The vibration of concrete
Author: Plowman, John M.
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1951
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M. O. Withey has stated that concrete was first vibrated in the year 1890, so that the idea is by no means a new one. It is a fact, however, that during the sixty years since that date Vibration has not been studied with the same degree of intensity that has been bestowed on other branches of Concrete, viz. grading and mix design, reinforcement and stress distribution, not to mention the very great advance in knowledge made by the investigators in the field of prestressing. The reason for this, the author feels, is twofold; being partly a mechanical one in that vibrating machines were not produced of suitable design to be both economical and reliable, and partly due to the lack of demand for concrete of high density and high strength. The first has now been remedied as can readily be seen by a casual glance at the advertisement pages of the technical press, whilst the coming of prestress has created a great demand for the second. It is well known that if any granular substance is placed in a container and then shaken it will automatically pack down taking up less space than when first put in. This is obviously due to the breaking down of the arches formed by the particles. This phenomena may be said to be the basis of vibration.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available