This paper is concerned with the development of a theory to predict the strength and failure mechanisms of systems consisting of discrete aggregated particles held together in some fashion. From a practical viewpoint, this would include materials such as plain and asphaltic concrete, and soils. In the case of concrete, the stone particles are held together by a matrix or mortar whereas for soils, the particles are held together by cohesive and/or frictional forces. The theory which is developed appears to show reasonable agreement with observed properties of such composites, and with some preliminary experi ments conducted on an epoxy resin system.
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