Particle density of filler - pyknometer method

The determination of filler particle density is carried out using the pyknometer method. The pyknometers used are smaller than those used for determining the density of aggregates. The capacity of the pyknometer used is usually 50 ml. 

According to CEN EN 1097-7 (2008), a small amount of dry filler, namely, 10 1 g, is placed in the 50 ml pyknometer along with a suitable liquid. The suitability of liquid is determined by its ability to detach fine grains. Liquids such as water, denatured ethanol, redistilled kerosene or toluene have been found to be suitable for many types of fillers. Significant attention during the test should be paid to the determination of the volume of the pyknometer with liquid, as well as to the absence of enclosed air in the mass of filler located inside the pyknometer. 

The masses are determined with an accuracy of 0.001 g. The final result is the mean of three test values and is expressed in 0.01 Mg/m.  

More information about calculating the volume of pyknometer and performing the test is given in CEN EN 1097-7 (2008). 

The equivalent American standard test method is carried out according to AASHTO T 100 (2010) (ASTM D 854 2010). The density of particles smaller than 4.75 mm is determined using volumetric flasks of 100 ml. More information about the test is given in the relevant standards. 

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CEN EN 1097-7.2008. Tests for mechanical and physical properties of aggregates — Part 7 Determination of the particle density of filler-Pyknometer method. Brussels CEN. 

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