An evaluation of the procedure and results of laboratory ...
The 11.2–14 mm fraction of the A N test was separated with a 12.5 mm sieve and then sieved with a 6.3 mm bar-sieve; the 12.5–16 mm fraction was sieved with an 8 mm bar-sieve. The FI is the transmission % of flaky particles in weight % (the shape which particles are broken into during the crushing process).