Page 18 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

REFERENCE
WORK PROCESS
DOCUMENT
v. Weight the mass of aggregate in the cylindrical metal
container (W2). Determine the mass of the uncrushed sample
alone as W3, in which: W3 = W2 – W1.

vi. Fix and secure the cylindrical metal container containing the
whole of the test sample in it in position on the base of the
machine.
vii. The test sample is subjected to 15 blows of the hammer
dropping 381 mm, each being delivered at an interval not less
than one second.

viii. Unsecure the cylindrical metal container containing the whole
of the crushed test sample and weight them. Determine the
mass of the crushed sample (M1).

ix. Sieve the whole of the sample in the tray on the 2.36 mm BS test
sieve until no further significant amount passes in 3 minutes.
Weight the fractions passing (M2) and retained (M3) on the
sieve to an accuracy of 0.1 g. And if total mass M2 + M3 is less
than the initial mass (M1) by more than 1g, discard the result
and make a fresh test.

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