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We study the bulk properties of isotropic bidisperse granular mixtures usingdiscrete element simulations. The focus is on the influence of the size(radius) ratio of the two constituents and volume fraction on the mixtureproperties. We show that the effective bulk modulus of a dense granular (base)assembly can be enhanced by up to 20% by substituting as little as 5% of itsvolume with smaller sized particles. Particles of similar sizes barely affectthe macroscopic properties of the mixture. On the other extreme, when a hugenumber of fine particles are included, most of them lie in the voids of thebase material, acting as rattlers, leading to an overall weakening effect. Inbetween the limits, an optimum size ratio that maximizes the bulk modulus ofthe mixture is found. For loose systems, the bulk modulus decreasesmonotonically with addition of fines regardless of the size ratio. Finally, werelate the mixture properties to the 'typical' pore size in a disorderedstructure as induced by the combined effect of operating volume fraction(consolidation) and size ratio.

Tuning the bulk properties of bidisperse granular mixtures by small amount of fines