This paper proposes the application of one of the most useful rock testing procedures, the Cerchar abrasivity test to predict the rate of wear of cutter-head and excavator bucket teeth in dredging, especially in rock. These predictions will permit the optimal selection of teeth, replacement rates and scheduling maintenance. The Cerchar Abrasivity Index (CAI) has been in use for over a decade in the field of tunneling. It has good record predicting the wear of cutter-teeth on tunnel boring machines (TBM). The CAI has become increasingly popular over other rock testing methods, including the unconfined compressive test (UCS) due to its simplicity, speed, low cost and the possibility of using much smaller samples. This paper provides an overview of the procedures of the CAI oriented towards dredging compared to other rock testing methods, and includes CAI data obtained by the author on Miami grainstones (sandstone and limestone) with the intent of optimizing the dredging ofthe Port of Miami, which is scheduled to start in 2013.
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