Humboldt H-4340 Sand Equivalent Test Set with Case - Manual (Page 10)

2. If the calculated sand equivalent is not a whole number, report it as the next higher
whole number. For example, if the sand equivalent were calculated from the example
in 12 above, the calculated sand equivalent would be:
(3.3/8.0) X 100 = 41.2
Since this calculated sand equivalent is not a whole number it would be reported as
the next higher whole number which is 42.
3. If it is desired to average a series of sand equivalent values, average the whole
number value determined as described above. If the average of these values is not
a whole number, raise it to the next higher whole number as shown in the following
exampIe :
• Calculate SE values: 41.2, 43.8, 40.9.
• After raising each to the next higher whole number they become 42, 44, 41.
• Determine the average of these values as follows: (42 + 44 + 41)/3 = 42.3
• Since the average value is not a whole number, it is raised to the next higher whole
number, and the sand equivalent value is reported as 43.
Precision
Before an operator is allowed to perform the sand equivalent test they must be capable
of obtaining consistent test results on representative samples of any given material when
the test is performed in accordance with the prescribed procedure for the particular
method used. An operator's test results are considred to be consistent if the individual
results of three tests performed by them on representative samples of the same material
do not vary by more than ± 4 points from the average of these tests.
If an operator is not capable of obtaining consistent results, they are not to perform the
sand equivalent test until they have perfected their technique sufficiently to bring their
test results into the specified limits.
1 This method is under the jurisdiction of ASTM committee D-18 on Soil and Rock and is
the direct responsibility of Subcommittee D 18.08 on Special and Construction Control
Tests. Current edition approved June 27, 1974. Published September 1974. Originally
published as D 2419-65T. Last previous edition D 2419-69.
2 Annual Book of ASTM Standards, Part 19
3 Annual Book of ASTM Standards, Part 41.