Production of agglomerates of well-defined structures and bond properties using a novel technique

Agglomerates of glass ballotini adhered together by an epoxy resin binder h ave been prepared to investigate the effect of macro-voids and interparticl e bond strength on the agglomerate breakage. A special novel preparation me thod is used to control the structure of the agglomerates by manipulating t he number and size of large cavities introduced in the assembly, and the pr operties of the interparticle bonds. The packing density obtained by this a gglomeration method is shown to be very reproducible, hence producing speci mens of nearly identical characteristics. This provides a tool to evaluate the influence of structural properties and bond strength on the mechanical strength of agglomerates. The strength has been assessed by studying the br eakage of agglomerates subjected to a single impact. The effects of the cur ing of the binder and the amount of glue on the agglomerate strength are re ported. Very small changes in solid fraction, obtained by generating large cavities into the assembly, drastically affect the extent of breakage of th e agglomerates upon impact.