Facts & Figures Book - KPI-JCI

The influence of the aggregate on the resulting productdepends on the following characteristics:1. The mineral character of the aggregate as related tostrength, elasticity and durability.2. The surface characteristics of the particles, particularlyas related to workability and bonding within ahardened mass.3. Aggregate with rough surfaces or angular shapesdoes not place or flow as easily into the forms assmooth or rounded grains.4. The gradation of the aggregates, particularly asrelated to the workability, density and economy ofthe mix.Of these characteristics, the first two are self-explanatoryand inherent to a particular deposit. In some cases, anaggregate can be upgraded to an acceptable product byremoving unsound or deleterious material, using beneficationprocesses.Gradation, however, is a characteristic which can bechanged or improved with simple processes and is theusual objective of aggregate preparation plants.11