The geotextile equivalent pore size tester (wet sieving method) is an instrument used to determine the effective pore size of geotextiles and related products. This instrument conforms to the GB/T17634 standard and is suitable for determining the effective pore size of all types of geotextile products.

Application

The equivalent pore diameter of geotextile and its related products was determined by wet screen method. The geotextile sample without tension is used as the screen, and the sample and graded particle material are sprayed with water under the specified vibration frequency and amplitude to make the graded particle material pass through the sample. The effective pore size of the specimen is expressed by the specific particle size of the passing particle material.

Standard

GB/T17634-2019: Geotextiles and geotextile-related products – Determination of the characteristic opening size – Wet sieving method

ISO/FDIS 12956-1998: Geotextiles and geotextile-related products – Determination of the characteristic opening size – Wet sieving method (Final Draft International Standard)

Parameters

Features

It is suitable for the determination of effective aperture of various geotextiles.

Split type design is adopted to avoid damage to the control system caused by vibration during high-speed operation;

The parts are connected with aviation plug, easy to disassemble and assemble;

Using mechanical vibrating screen vibration, smooth and efficient;

Fully transparent protective device, can be cleaned to observe the experimental situation

The sample is placed on the metal grid to avoid excessive deformation of the sample due to the quality of the particle material.

Vibration time can be set arbitrarily, digital display time:

Adjustable amplitude, knob adjustment mode, simple operation;

Convenient experiment, simple operation.

Accessoriess

Standard sieve holder

Water tank

Water pump

Flow meter

Particle dispensing device

Vibrating screening table

Particle collection tray

Precision balance

Data logging software

FAQ

1. What is a Geotextile Equivalent Aperture Tester (Wet Sieve Method)?

This device measures the equivalent pore size (aperture) of geotextiles using the wet sieve method. It evaluates the geotextile’s filtration performance by determining the largest particle size that can pass through the fabric when saturated with water.

2. How does the wet sieve method work?

The geotextile sample is placed under water and a standardized suspension of soil or particles is passed through it. The tester collects and measures the retained particles. The equivalent aperture is calculated based on the size distribution of particles passing through the fabric.

3. What types of geotextiles can be tested?

It can test woven, nonwoven, and knitted geotextiles used in civil engineering, drainage, erosion control, and filtration applications. The device accommodates various sample sizes and thicknesses.

4. What parameters are measured during testing?

The machine measures the equivalent aperture (size of the largest passing particles), filtration efficiency, and sometimes flow rate. These parameters help predict how the geotextile will perform under saturated conditions.

5. Why is equivalent aperture testing important?

Testing ensures that geotextiles allow water to pass while retaining soil or sediment, preventing erosion and maintaining structural integrity. It helps engineers select the right material for specific construction and environmental applications.

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