The particle density of fine aggregate as defined by ASTM C128 is calculated using the formula: (dry weight of aggregate) / (weight of pycnometer filled with water + saturated surface dry sample weight - weight of pycnometer filled with water and aggregate). The term (weight of pycnometer filled with water + saturated surface dry sample weight - weight of pycnometer filled with water and aggregate) represents the weight of water displaced by the aggregate. It is crucial to ensure that the numerator reflects the "weight of pycnometer with only saturated surface dry sample" for accurate calculations.
PREREQUISITESCivil engineers, materials scientists, and quality control professionals involved in aggregate testing and concrete mix design will benefit from this discussion.
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."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 ?