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The design of aggregate gradings to minimum and controlled porosity - a study of packing characteristics and void characteristics in aggregates

Lees, G. (1967)
Ph.D. thesis, University of Birmingham.

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A study of the factors affecting the packing and porosity of particles has been made and a general theory for the combining of aggregates of varying shapes and sizes in order to achieve minimum porosity is proposed.

Arising out of this theory experiments have been carried out from the results of which graphs have been prepared to enable the determination of the optimum percentage of fine material for maximum density in two component systems. A method for extending the application of these results into the province of the design of multicomponent systems
of both the continuous grading and intermittent grading types has been devised, and in the latter type the inherent gaps in the grading have been related to measured void characteristics. From another graph the value of porosity appropriate to any such mixture can be estimated.

The theory and relevant graphs are believed to be of general
application in the fields of mixtures comprising aggregates of any shape or combination of shapes whether these be dry aggregates, wet aggregates, bitumen or tar coated aggregates or concrete aggregates, and to cover all possible environmental conditions of the particulate
mass such as the applied compactive effort and boundary effects.

Type of Work:Ph.D. thesis.
Supervisor(s):Kolbuszewski, J.
School/Faculty:Faculties (to 1997) > Faculty of Science
Department:Department of Transportation and Environmental Planning
Additional Information:

Publications and graphs related to this thesis are available with the printed copy in the University Library.

Subjects:TA Engineering (General). Civil engineering (General)
TE Highway engineering. Roads and pavements
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:3586
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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