Hydrodynamic Sieve Test Apparatus

Hydrodynamic Sieve Test Apparatus Hydrodynamic Sieve Test Apparatus Product Code: EKE 243

EKE 24201 Rounded Beads, made of glass, size 0.85 mm (passing 1 mm and retained at 0.85 mm)
EKE 24202 Rounded Beads, made of glass, size 0.425 mm (passing 0.85 mm and retained at 0.425 mm)
EKE 24203 Rounded Beads, made of glass, size 0.25 mm (passing 0.425 mm and retained at 0.25 mm)
EKE 24204 Rounded Beads, made of glass, size 0.18 mm (passing 0.25 mm and retained at 0.18 mm)
EKE 24205 Rounded Beads, made of glass, size 0.15 mm (passing 0.18 mm and retained at 0.15 mm)
EKE 24206 Rounded Beads, made of glass, size 0.075 mm (passing 0.15 mm and retained at 0.075 mm)
EKE 24301 Spare Drum

Soil reinforcement is a recent and fast developing technique to improve soil behaviour for a variety of civil engineering works; e.g. earth retaining structures, slope stability, land slides protection works, pavement, etc.
In order to utilise fully the strength of reinforcement material while transferring load and forces via soil or aggregate to the reinforcement, a correct assessment of the soil/reinforcement frictional relationship is essential. The frictional properties can be assessed by means of a shear box which is modified either to conduct a 'Modified Shear Test' or 'Pullout Test'. In the former test, reinforcement material is placed and clamped in the plane of shear with soil above the fabric, whereas in the later test, the fabric placed between the top and bottom shear boxes is covered on both sides with soil and is then pulled out to evaluate the frictional resistance. This interface friction measurement apparatus has been specially designed to evaluate both 'frictional' as well as 'pull out resistance' of soil reinforcing materials at a shear rate and drainage condition desired by the designer.

The percentage passing of different fractions determines the porometry of the geotextile investigated. In the Hydrodynamic Sieving Method, the geotextile specimen, loaded with a certain quantity of glass bead fraction, is continuously rotated in a water trough, forcing the glass beads to pass through the geotextile openings. The apparatus consists of two test drums of 14 cm dia and 7 cm effective length with 16 nos. of 4 mm dia rods provided circumferentially at equal spacing to hold the geotextile specimen in position. Two troughs to contain the test drums are supported on
horizontal axis, facilitating free rotation and capable of being filled with distilled water to a level of 20 mm below the drum axis. The clearance between the trough and the geotextile could be maintained at about 40 mm.
The apparatus is provided with a motor drive and a change gear assembly to enable rotation of the drums at a speed of 5 rpm to 30 rpm.
For conducting the test, the geotextile specimen is cut and stitched to get a shape of 14 cm dia and 10 cm length to insert over the drum tightly, after immersing the specimen in distilled water for one hour, and secured by rubber 'O’ rings. After placing 50g of smallest size glass beads inside the drum, the lid is secured and the drum with the geotextile placed in distilled water to the desired level and rotated at 20 rpm for 1,500 cycles. In order to get the optimum filtration opening size, the drum is rotated at a speed of 5 rmp to 30 rpm for 250 to 2,500 revolutions. The percentage of beads passed through the geotextile by dry weight is determined. The test is repeated with increasing size of glass beads till less than 5% of the beads by weight pass through the geotextile.