What does the particle density of ASTM C128 represent?

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The particle density of fine aggregate as defined by ASTM C128 is calculated using the dry weight of the aggregate divided by the weight of water displaced by the saturated surface dry sample in a pycnometer. The formula includes the weight of the pycnometer filled with water, the saturated surface dry sample, and the weight of the pycnometer filled with water and aggregate. This calculation effectively measures the volume of water displaced, which is crucial for determining the aggregate's density. The discussion clarifies that the numerator should reflect the weight of the pycnometer with only the saturated surface dry sample. Ultimately, ASTM C128 provides a standardized method for assessing the particle density of aggregates.
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I was told that the bulk density of SP Gr of ASTM C128 for fine aggregrate is (dry weight of aggragrate)/ ( weight of pycnometer filled with water + saturated surface dry of sample - weight of pycnometer filled with water and aggragrate )...What does the ( weight of pycnometer filled with water + saturated surface dry of sample - weight of pycnometer filled with water and aggragrate ) represent ?
 
goldfish9776 said:
What does the ( weight of pycnometer filled with water + weight of pycnometer with only saturated surface dry [] sample - weight of pycnometer filled with water and aggragrate ) represent ?
This represents the weight of the water displaced by the aggregate (plus the weight of the pycnometer). Notice my changes in red above. Note also that the numerator in your calculation should also be "weight of pycnometer with only saturated surface dry sample."

ASTM C128 actually gives the "particle density" of the aggregate.
 
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