Definitions of Material Properties
The following descriptions and material properties need to be entered in the gauge for measurement or data
reporting purposes:
Material ID: Usually a numeric entry that will associate the soil being tested with the gradation and proctor
test report. Examples of soil or material ID’s may include ’33.1099’ or ‘776632. Material IDs are limited to 13
characters.
Description: Typically a brief description of the soil that allows the operator to visually identify the material
being tested. Examples may include ‘clayey sand red’, or ‘light brown silt’. Descriptions are limited to 13
characters.
Max Dry Density: This is the maximum dry density or target density or Proctor number for the material being
tested. It is input in pcf or kg/m³. Be sure the units of the gauge are in the same units you wish to enter.
This value can be found in a Proctor test report completed in accordance with ASTM D 1557 or ASTM D 698.
This is used by the SDG as the value against which the measured dry density is compared to calculate percent
compaction.
Opt Moisture: This is the optimum moisture content for the material being tested. This value can be found in
a compaction test report completed in accordance with ASTM D 1557 or ASTM D 698.
PL: Plastic Limit. This property describes soils with a high clay and silt content. It is defined as the moisture
content in percent at which the sample begins to exhibit plastic behavior as it transitions from having semi-solid
properties. This value is determined as outlined by ASTM D 4318.
LL: Liquid Limit. This property describes soils with a high clay and silt content. It is defined as the moisture
content in percent at which a sample begins to exhibit liquid behavior as it transitions from having plastic
properties. This value is determined as outlined by ASTM D 4318.
Cu: Coefficient of Uniformity. Cu is defined as the ratio of D
60
/ D
10
, where D
60
is the particle diameter of
which 60% of the sample is smaller, and D
10
is the particle diameter of which 10% of the sample is smaller. Cu
can be calculated from values taken from a particle size distribution plot defined by ASTM D 422.
Cc: Coefficient of Curvature. Cc is defined as D
30
2
/ (D
60
x D
10
). Cc can be calculated from values taken from a
particle size distribution plot defined by ASTM D 422.
% Gravel: The percentage of material by mass passing a 3 in. (75mm) sieve but retained on a #4 (4.75mm)
sieve. %Gravel can be taken from a particle size distribution report defined by ASTM D 422.
% Sand: The percentage of material by mass passing a #4 (4.75mm) sieve but retained on a #200 (75μm).
%Sand can be taken from a particle size distribution report defined by ASTM D 422.
% Fines: The percentage of material by mass passing a #200 (75μm) sieve. %Fines can be taken from a
particle size distribution report defined by ASTM D 422.
Note: Be sure that the % Greater than 3”, % Gravel, % Sand and the % Fines add up to 100%.
% Greater than in: The percentage of material by mass retained on a inch (19.0mm) sieve. % Greater
than inch can be taken from a particle size distribution report defined by ASTM D 422.
% Greater than 3 in: The percentage of material by mass retained on a 3 inch (75 mm) sieve. % Greater than
3 inches can be taken from a particle size distribution report defined by ASTM D 422.
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