In-Plane Permeability Test Apparatus Manufacturers | Thickness Gauge Manufacturers | Universal Testing System for Geotextiles Manufacturer Hydrodynamic Sieve Test Apparatus Manufacturers

IL - 705
In-Plane Permeability Test Apparatus :

This test is necessary for drainage application. The permeameters can be of parallel flow or radial flow type. In either case, flow occurs along the plane of the permeameters. In the apparatus, flow occurs radially outwards, from a central hole to the periphery of a circular specimen. The transmissivity is defined as the volumetric rate of flow per unit width of geotextile and unit hydraulic head.

Specifications

Flow : Radially outwards
Specimen diameter : 100 mm
Range of Pressure : Upto 800 kPa
Head of Water : Upto 30 cm

IL - 706
Thickness Gauge :

Thickness is one of the basic physical properties used to control the quality of many geotextiles and geosynthetic. This equipment is simple to operate and thickness of the geosynthetic / reinforcing material can be measured with an accuracy of 0.002 mm for thickness upto 10 mm. Accuracy is 0.01 mm for thickness greater than 10 mm. Simple mechanism is provided to apply desired foot pressure varying from 1 to 10 kPa as per various international standards. Surface plate is grounded and is rust free to enable reproducible results.

IL - 707
Universal Testing System for Geotextiles :

The evaluation of the tensile properties of geotextiles is of paramount importance not only in reinforcement application but also in all other uses. Important properties include stress-strain behaviour, ultimate strength in uniaxial tension (under different widths), creep, etc. Recent researches have made it clear that the measured stress-strain behaviour of geotextiles is significantly influenced by details of testing procedures like method of gripping the fabric, rate of deformation, sample size / aspect ratio, initial preload and fabric conditioning. Universal Testing System for Geotextiles enables determination of these properties under a variety of test conditions. The 100 kN capacity systems have speed ranges from 5 to 320 mm/min. The following attachments are available for this system at extra cost :

Narrow and Wide Width Tensile Strength
Two clamping systems 8 cm wide and 22.5 cm wide are mechanical wedge type and facilitate conducting Narrow Strip and Wide Width Tensile Strength tests as per many international specifications, viz Indian, British, ASTM etc. These grips allow simple and rapid sample loading. Roller type grips required in high strength geotextile testing can be supplied as optional extra.

Grab Tensile Strength Test
This test measures the ability of the geotextile to distribute concentrated loads. Specially devised clamps (25 mm wide) with a gauge length of 100 mm are placed across 200 mm square samples or 200 mm x100 mm samples. The sample is then subjected to tension at a specified rate until failure occurs. It is widely used by manufacturers as a quality control tool and as such is the most commonly reported tensile strength value. It can also be used for relative comparisons between geotextiles of the same type.

Trapezoidal Tear Resistance Test
Geotextiles can be cut or punctured during field installation, which can create a possible condition by which strength is controlled by a tearing resistance. In the method suggested by ASTM-D4632, an outline of an isosceles trapezoid is marked on a rectangular specimen (150 mm x 75 mm) cut for the determination of tearing strength, (with a 6 to 9 mm cut) and the non-parallel sides of the trapezoid marked on the specimen are clamped in parallel jaws of the Tensile Testing System. Thereby, the separation of the jaws is continuously increased with simultaneous recording of the load, so the tear propagates across the specimen. The tearing strength is the value for estimating the relative tear resistance of different geotextiles or different directions of the same fabric.

CBR Push Through Test
In this test developed in West Germany (DIN-54307 E), fabric is clamped to give an inner diameter of 15 cm and a standard CBR plunger is pushed centrally through a fabric at a specified rate. The load at failure is the push through load and when divided by the cross-sectional area of the plunger, gives CBR push through resistance. This gives the resistance of fabric to withstand localised pressure, which is particularly noticed in pavement systems.

Puncture Test
In this test, developed by the Corps of Engineers, USA, the geotextile specimen is clamped to obtain an inside dia of 44.45 mm and force is applied through an 8 mm dia plunger till failure. The Modified ASTM D-3787 provides for a hemispherical plunger and accordingly has been developed. The puncture strength so obtained is felt to reflect the fabric's ability to withstand aggregate penetration.

IL - 708
Long Term Flow Test Apparatus :

The tests for permissivity and transmissivity help in comparing one fabric to another, but gives no indication of the hydraulic behaviour of the composite soil-fabric system. Under steady state and reversing flow conditions, fabric clogging or binding causes a decrease in water flow rate and corresponding increase in hydraulic head loss through the geotextile. When the potential for fabric clogging is significant, clogging resistance of filter fabrics should be evaluated to ensure adequate long term filter performance. As the clogging is highly soil dependent, soil fabric permeability test is suggested to determine the long term flow capability of a geotextile.

Specifications

Specimen diameter : 100 mm
Mould for compaction of soil : 10 cm dia x 11.2 cm high
Head of water : Upto 37.5 cm

Hydrodynamic Sieve Test Apparatus
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 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 50 g 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 rpm 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 5% or less of the beads by weight pass through the geotextile.

Geotextile Testing Machines