Gilson ASTM D4791 Operating Manual

ASTM D4791
iNtrOduCtiON:
These instructions are a general guide for operation of this
device. The complete procedure for determination of relative
shape characteristics of coarse aggregates using the Four-
Station Caliper is described in ASTM D4791. The user should
carefully review the ASTM procedure before testing.
OPErAtiNg iNStruCtiONS:
Individual particles of aggregate of specific sieve sizes are
measured to determine the ratios of width to thickness and
length to width. The applied ratios are 1:2, 1:3, 1:4, and 1:5
according to desired specifications.
A. Test for Flatness
A. For Classification of Flat Particle Testing:
The user should set the larger opening of the Caliper
equal to the particle width. If the thickness of the same
particle can be placed within the smaller opening without
readjusting the Caliper, the particle is classified as Flat.
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Four-Station Proportional Caliper
P.O. Box 200, Lewis Center, Ohio 43035-0200
E-mail: customerservice@gilsonco.com
OPErAtiNg MANuAl
HM-38B
B. For Classification of Elongated Particle Testing:
The user should set the larger opening of the Caliper equal
to the particle length. If the width of the same particle can
be placed within the smaller opening without readjusting
the Caliper, the particle is classified as Elongated.
If the particle does not meet either classification of Flat or
Elongated, it is classified as Neither Flat nor Elongated.
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HM-38B
B. Test for Elongation
(Continued on back.)
Rev: 06/15/2015
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