REDUCED PROPELLER SPEED EFFECTS ON LCPC ROCK ABRASIVITY TEST

Abstract

Twenty one samples from all three generic rock types were tested for the evaluation
of their abrasivity by Laboratoire Central des Ponts et Chaussées (LCPC) test. The LCPC tests were
conducted at 2250 rpm, i.e., half of the suggested speed of 4500 rpm. The statistical analyses on the
choice of lower speed has shown reasonably good correlations with the suggested speed of 4500 rpm
for the measurement of LCPC Abrasivity Coefficient, ABR (g/t) for all the selected rock samples.
Further the relationships developed between one group of sedimentary rocks and other group
containing igneous and metamorphic rocks has also shown moderate to very good correlations of ABR
(g/t) for the lower and suggested speeds tested.