Dry vs Wet Sieving in Geotextile Test


Sieving refers to the process of separating a mixture of different particle sizes into several different particle size levels through a perforated sieve surface. After weighing them separately, the particle size distribution expressed as a mass percentage can be obtained. According to the different moisture content of the powder, it is mainly divided into two categories: dry sieving and wet sieving. The following will introduce the definition of dry sieving and wet sieving, the operating steps and equipment required to test the aperture of geotextiles using these two methods, and the difference between the two methods.

Dry sieving

What is dry sieving
Place the dry powder material in the screening equipment, and use mechanical vibration and other methods to make the powder pass through the screen. After the screening is completed, the weight of the screen residue and the weight of the material on the bottom of the screen are counted. The sum of the two is then subtracted from the weight of the powder initially placed in the screen to calculate the loss during the screening process.
Dry sieving method steps
1. Sample preparation: Lay the geotextile sample flat and forcelessly on the supporting grid, and press it with a clamp to ensure that the sample is horizontal and not affected by tension.
2. Granular material selection: According to the test requirements, select standard granular materials of a certain mass and diameter. These granular materials should have a uniform particle size distribution and a certain hardness to ensure the accuracy and stability of the screening process.
3. Screening test: Sprinkle the standard granular material evenly on the geotextile sample, and then start the vibration system. At the specified vibration frequency and amplitude, the granular material passes through the sieve holes of the geotextile sample, while the larger particles are retained on the sample.
4. Collection and weighing: The particles that pass through the sample flow out of the collection tank, collect them and weigh them. At the same time, record the particle mass before and after the screening test, and calculate the screening rate.
5. Data analysis: Replace standard granular materials of different diameters for multiple tests, and draw a curve of the diameter of the standard granular material and the screening rate, which is the pore size distribution curve of the sample. According to the curve, the effective pore size of the geotextile can be calculated and its filtration performance and particle retention capacity can be evaluated.
​Dry sieving apparatus
The apparent/equivalent opening size of a geotextile is ascertained using a dry sieve test apparatus. Geotextile and composite geotextile effective apertures can be determined using the effective aperture determination device (dry sieve technique). When it comes to material in the laboratory and laboratory of sieve analysis, the dry sieve method, the pertinent requirements, and its performance meet the national standards applicable to the geological, metallurgical, chemical, coal, defense, scientific research, grinding wheel, cement, and construction departments.
Cilck to find dry sieving tester here

Wet sieving

What is wet sieving
If the powder has a high moisture content, is easy to stick together, and does not react with water, Wet sieving is often better than Dry sieving. Unlike Dry sieving, Wet sieving requires liquid to promote the separation between particles. During the process, the particles are in a semi-suspended state, reducing stacking and backlog, so the screening accuracy will be higher than Dry sieving. In addition, Wet sieving can better adapt to ambient temperature and atmospheric humidity and improve operating conditions.
Wet sieving apparatus
Using the wet-sieving technique, the DW1330W Wet Sieve Test Apparatus is used to measure the characteristic opening size of a single layer of a geotextile or product linked to geotextiles. Water is used to wash through an amount of graded granular material that has been spread out on the geotextile’s surface. The graded granular material that passes through the geotextile and functions as soil is evaluated after the geotextile serves as a sieve. The size of the graded granular material transmitted (d90) is matched by the characteristic opening size (O90) of the geotextile.
More about wet sieving apparatus

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