  Connectedness percolation phenomena in the two-dimensional (2D) packing of
binary mixtures of disks with different diameters were studied numerically. The
packings were produced using random sequential adsorption (RSA) model with
simultaneous deposition of disks. The ratio of the particle diameters was
varied within the range $D=1$-$10$, and the selection probability of the small
disks was varied within the range 0-1. A core-shell structure of the particles
was assumed for the analysis of connectivity. The packing coverages in a
jamming state for different components, connectivities through small, large and
both types of disks, the behavior of electrical conductivity were analyzed. The
observed complex effects were explained accounting for the formation of
conductive "bridges" from small disks in pores between large disks.
