AS 1289.3.6.3:2020 pdf free.Methods of testing soils for engineering purposes Part 3.6.3: Soil classification tests – Determination of the particle size distribution of a soil – Standard method of fine analysis using a hydrometer.
6 Determination of factor F1
6.1 Volume
Determine the volume of the hydrometer bulb (Vh) using one of the following two methods:
(a) From the volume of water displaced —
(i) pour approximately 800 mL of water into the graduated I L measuring cylinder, read and record the water level;
(ii) immerse the hydrometer carefully in the water, allow it to float, and again read and record the water level; and
(iii) record, in millilitres, the difference between the two readings as the volume of the hydrometer bulb.
NOTE The error due to inclusion of the stem volume is negligible.
From the mass of the hydrometer:
(i) determine the mass of the hydrometer to the nearest 0.1 g; and
(ii) record the mass, in grams, as the volume in millilitres of the hydrometer bulb mark. NOTE The error due to inclusion of the stem volume is negligible.
6.2 Hydrometer scale
The hydrometer scale shall be determined as follows:
(a) Determine the sectional area of the I L cylinder to be used in the test by measuring the distance between two graduations (e.g. 100 mL to 900 mL). Divide the volume, in millilitres,included between the graduations by the measured distance, in millimetres, and multiply by 1000 to obtain the sectional area (A) in square millimetres.
(b) Measure and record the distance (d), in millimetres, from the graduation mark nearest to the neck of the stem of the hydrometer to each of the other major graduation marks (Rh).
(c) Measure and record the distance (r), in millimetres, from the neck of the bulb to the nearest graduation mark.
(d) Calculate H1 = d + , in millimetres, corresponding to each graduation mark (see Figure 1).
(e) Measure the height of the bulb (h). in millimetres, from the neck to the bottom of the bulb, Record this distance as equal to twice the length from the neck of the bulb to its centre of volume.AS 1289.3.6.3 pdf download.