There are several traditional methods for determining
particle shape of coarse aggregates. The European Committee
for standardization describes various test procedures.
Two of which deal with particle shape measurement:
1) flakiness index CEN: EN933-3 (6) part 3: determination
of particle shape of aggregates and
2) shape index CEN: EN 933-4 (7) part 4: determination of
particle shape of aggregates.