Page 31 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

REFERENCE
WORK PROCESS
DOCUMENT

c) The sample is sieved through BS Standard sieve specified in
Table 3.2
d) A minimum of 200 pieces of each fraction is taken and
weighed.
e) In order to separate elongated materials, each fraction is
then gauged individually for length in the length gauge.
f) The pieces of aggregate from each fraction tested which
could not pass through the specified gauge length with its
long sides elongated are collected separately to find the
total weight of aggregate retained on the length gauge from
each fraction.
g) The total amount of elongated material retained by the length
gauge is weighed to an accuracy of 0.1% of the weight of
sample.

CALCULATION FOR ELONGATION INDEX TEST

Elongation Index (FI) = Weight retained slot x 100
Weight Original

ElongationIndex = Total(M2) x100
Total (M2) + Total (M3)

Higway Engineering Laboratory page 18