BS EN 13041:2011 pdf download – Soil improvers and growing media — Determination of physical properties — Dry bulk density, air volume, water volume, shrinkage value and total pore space

BS EN 13041:2011 pdf download – Soil improvers and growing media — Determination of physical properties — Dry bulk density, air volume, water volume, shrinkage value and total pore space 5.5 Ventilated drying oven set at (103 ± 2) °C. 5.6 Analytical balance with a scale interval of 0,1 g. 5.7 Shallow vessel, spoon or scoop approximately 50 ml capacity. 6 Preparation Prepare the laboratory sample in accordance with 8.4 of EN 13040:2007. 7 Procedure 7.1 Moistening, saturating and equilibration at –50 cm water (–5 kPa) pressure head 7.1.1 Fill at least 2 tubes (see 5.2) with the test portion taking care to prevent artificial air voids. Cover each tube with synthetic gauze (see 5.1.2.3) secured with an elastic band. Place the tube on the grid in a dry water bath (see 5.3). 7.1.2 Slowly, with constant flow, fill the bath with water until the level reaches to within 1 cm below the top of the tube. Filling should take approximately 30 min. 7.1.3 If a tube shows signs of floating, place a weighted disc on the top of the tube allowing air to evacuate and at the same time ensuring that compaction of the sample does not take place, (see Figure A.4). 7.1.4 Allow to stand maintaining a constant water level until the sample is thoroughly wetted (up to 36 h). 7.1.5 Remove the tubes and without delay, transfer the tubes to the sand suction table. The bottom of the tube should be fully in contact with the sand. Apply a –50 cm water (–5 kPa) pressure head, measured from the bottom of the tube, for 48 h. 7.2 Filling tubes 7.2.1 Secure the gauze (see 5.1.2.3) with the collar (see 5.1.2.2) to the base of the lower sample ring (see 5.1.2). Attach and secure the upper sample ring (see 5.1.3) to the lower sample ring. 7.2.2 Empty the tubes containing the equilibrated (–50 cm water, –5 kPa) wet sample from 7.1.5 onto a clean surface and gently mix taking care not to cause any physical damage to the sample. 7.2.3 Transfer using the shallow vessel (see 5.7) approximately 50 ml portions of the mixed sample to the prepared sample rings taking care to avoid compaction or artificial air voids and filling the cylinder and removable ring completely. 7.2.4 Fill at least 4 units with the sample. Place the unit on the grid in a dry water bath. Slowly,...