A DETERMINATION OF SHELL CONTENT TESTING STANDARD IN AGGREGATE
BS 812 (1985) Testing aggregates, Part 106: Method for determination of
shall content in
aggregate.
B. To determine sell content in coarse aggregate
C) APPARATUS
Sample divider (riffle box).
Ventilated oven, thermostatically controlled to maintain a temp. of
105C
Balances
5 kg capacity accurate to 1 g
500 g capacity accurate to 0.1 g
4. Test sieve-10.0 mm and 5.0 mm complying with 5 410
D. PROCEDURE
L Preparation of test portion
1. Obtain the laboratory sample as per the standard procedure (B5 812: Part
102)
2 Dry the laboratory sample at a temperature of 1055 C to achieve a dry
mass, which is
constant to within 0.1 %, and allow the sample to cool
Reduce the laboratory sample to a test portion, which complies with the
following
Nominal maximum size
Minimum mass of
of aggregate (mm)
63
test portion required
(kg) 50
35
50
40
28
20
15
3.
3.
0.5
14
10 II. Testing Procedure
If sieve analysis in accordance with BS 812: Part 103 has been done, the
combined Practions retained on the 10.0 mm and larger test sieves and the
combined fractions passing the 10 m and retained on the 5.0 mm test sieves
may be used for the determination of shell contest. In such case, go to step
3.
Separate the test sample into test fractions by sieving through 10.0 mm and
5.0 mm te