What are the basic testing items of geotextiles?

Basic testing items of geotextiles: breaking strength (CBR), compact density, holding tensile strength, puncture resistance analysis, reinforcement performance analysis, isolation performance analysis, hole curve bottleneck curve, anti-microbial erosion performance analysis, vertical permeability performance analysis, aging performance analysis, durability performance analysis, tear strength, vertical permeability coefficient, equivalent pore size 090, elongation at break, breaking strength, width deviation, trapezoidal tear strength, tensile strength, thickness, unit area quality.

Quality per unit area.

Standard: "Geosynthetics Geotextiles and Geotextiles Related Products Determination Method for Unit Area Quality" GB T13762-2009

Specimen requirements: 100cm, at least 10 pieces.

Specimen humidification: 24h under standard atmospheric pressure

Weighing accuracy: 10mg

The result is as follows: PA=(MX10000) A

Pa is the mass per unit area, the unit is grams per square meter (g) m, the unit is the mass of the sample, the unit is grams (g).

a-sample area, the unit is square centimeter (cm).

The results were revised to 1 g and the coefficient of variation was calculated.

If a 100 cm specimen does not represent the entire structure of the product, a larger area can be used.

For geosynthetics with larger meshes, the specimen should be sheared from the center of the connection of the two nodes that make up the mesh unit. It contains at least 5 constituent elements in both vertical and transverse directions.

National Testing Standards for Geotextiles:

GB T3923 1—1997 Tensile properties of textile fabrics Part L: Determination of breaking strength and elongation at break strip method.

Determination of the width of woven fabrics in GB T4667-1995.

GB T13760—1992 Sampling and sample preparation of geotextiles.

Determination of the thickness of GB T13761-1992 geotextiles.

GB T13762-1992 method for determining the mass of geotextile per unit area.

GB T13763-1992 Test method for trapezoidal tearing strength of geotextiles.

GB T14799-1993 Geotextile pore size determination method: dry sieve method.

GB T14800-1993 Geotextile Breaking Strength Test Method.

GB T15788-1995 Geotextile tensile test method, wide strip method.

GB T15789-1995 method for determining the permeability of geotextiles.

GB T16989—1995 Geotextile joint Determination of fracture strength.

GB T17630-1998 Dynamic perforation test drop cone method for geotextiles and related products.

GB T17632-1998 Test method for acid and alkali resistance properties of geotextiles and related products.

Determination of water flow rate in the plane of GB T17633-1998 geotextile and its related products.

GB T17634-1998 Determination of effective pore size of geotextiles and related products.

GB T17635 1-1998 Determination of frictional properties of geotextiles and related products Part L: Direct shear test.

GB T17636-1998 Determination of anti-wear performance of geotextiles and related products, abrasive cloth slider method.

Determination of tensile creep and tensile creep fracture properties of GB T17637-1998 geotextiles and related products.

Summary. Hello, dear, I am glad to answer for you, the testing standards of geotextiles: uneven cloth surface, creases, sundries, bad edges, damage, thin roads, broken yarn, lack of yarn and other defects.

Hello, ruining the photo, I am happy to answer for you, geotextile stupid testing standards: uneven cloth surface, crease fiber book, sundries, bad edges, damage, thin road, broken yarn, lack of yarn and other defects.

GB Ling Fiber T 3923 1—1997 Textiles Tensile properties of fabrics Part L: Determination of breaking strength and elongation at break Strip method GB T 4667—1995 Determination of width of machine hail fabrics GB T 1997

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There are the following types of geotechnical testing items: 1. Determination of soil bulk density and moisture content: It is used to determine the volume weight and water content of the soil in order to calculate the soil mass.

2. Soil texture and color analysis: determine the particle distribution and color distribution of the soil to classify and identify the soil. 3. Soil classification and seepage and penetration characteristics test

It is used to determine the permeability of the soil and the water flow to evaluate the drainage capacity and stability of the soil. 4. Strength, stability and deformation characteristics test: including compression test, shear test, triaxial test, dynamic compaction test, etc., to evaluate the bearing capacity, shear tensile and compressive capacity of soil and its deformation characteristics.

5. Datum point measurement: used to calibrate the ground datum height and the verticality of the building. 6. Analysis of soil chemistry and chemical components:

It is mainly used to detect contaminants in the soil and assess the impact on the environment. 7. Geotechnical engineering quality monitoring: track and analyze the deformation and axial force data of buildings, soil and foundations, and carry out follow-up safety assessment and design through the analysis results.

It should be noted that the specific geotechnical testing items may vary depending on the type of project, regional environment, selected testing methods, technical equipment, etc. For different projects such as soil pile foundation, slope protection, and roadbed design, there may be corresponding special tests, which can be tested according to the actual situation.

The main inspection items are:

Tensile strength: In a tensile test, the maximum tensile stress experienced by the specimen until fracture is the tensile strength, which is called tensile strength in the academic world.

Elongation: The elongation is the percentage of the ratio of the total deformation of the gauge section after the tensile fracture of the specimen to the length of the original gauge length.

Tear Strength: It is a term defined in a test method for determining the tear resistance of a film or sheet. This method is a tear test in which a specimen with a specified crack is cut on a special testing machine.

Burst strength. Thickness. Quality per unit area.

Permeability coefficient: The permeability coefficient is also known as the hydraulic conductivity coefficient. In isotropic media, it is defined as a unit flow per unit of hydraulic gradient and indicates how easy it is for a fluid to pass through a pore skeleton.

Gram weight per unit area or tensile strength, CBR breaking strength, these two are the most basic, and the others are not too important.

Geotextile manufacturers give you the answer:

Staple fiber (filament) geotextile implementation standard GB T 17638-2017

Polyester filament geotextiles implement the standard GB T 17639-2008

【Testing standards for geotextiles】The current standard is: GB T17639-2008 "Geosynthetics filament spunbond needle-punched nonwoven geotextiles". For details, please refer to the webpage cover as shown below

Staple fiber needle punch 17638 filament needlepunch 17639 filament weaving 17640 weaving 17690

Geotextiles are generally in a group of 5000. However, in some cases, it is determined in detail according to the circumstances of the project.

Geotextiles: also known as geotextiles, it is a permeable geosynthetic material made of synthetic fibers through needle punching or weaving. The finished product is cloth-like, with a general width of 4-6 meters and a length of 50-100 meters.

Geotextiles are divided into woven geotextiles and non-woven geotextiles. Geotextile has excellent filtration, drainage, isolation, reinforcement and protective effects, and has the characteristics of light weight, high tensile strength, good permeability, high temperature resistance, freezing resistance, aging resistance and corrosion resistance.

Geotextile selection: generally the most commonly used two geotextiles GB T 17639-2008 is filament spunbond needle-punched non-woven geotextile, GB T17638-1998 is staple fiber needle-punched non-woven geotextile, the general arrangement of testing is to do physical and mechanical properties (dynamic perforation, unit area quality, thickness, wide strip stretching, trapezoidal tear) other indicators are not mandatory.

A group of 5,000 is a denser point, and generally more is a group of 10,000 or 20,000 square meters for random inspection.

5000m for a group of less than 5000 also do a batch of 1-3 rolls in each batch of sampling.

It depends on the situation:

Some are in groups of 5,000 meters; Some are in groups of 10,000 meters, and some are in groups of 20,000 meters.

Geotextiles are generally in a group of 5000. It is determined according to the requirements of the owner and the supervisor of the project.

Go to 2 square to send it for inspection.

Plastic knitted fabrics: 100,000 square meters of products with the same formula and the same specification are a batch; When it is less than 100,000 square meters, the actual number is taken as a batch.

Non-woven geotextiles: a batch of products of the same specification produced in the same shift; When the batch is small, 100 rolls can be accumulated as a batch, but when the output is still less than 100 rolls in a week, the output within the same batch is taken as a batch.

Plastic woven fabrics: in batches, 3 rolls of each batch of products are randomly selected as samples Geotextiles: 2% 3% of each batch of products is randomly selected, but not less than 2 rolls.

Sample requirements: the whole width is more than 3m long, the sample can be rolled up, but not folded.

If you are willing to smash the acceptance, you will smash the acceptance in vain.

Executive standard national standard: GB T176422-1998

The main technical indicators of the product are: product weight (g, film thickness (mm), mass deviation per unit area (%), breaking strength (kn m), longitudinal and transverse elongation at break (%), tear strength (kn), cbr breaking force strength (kn), equivalent pore size o55 (mm), vertical permeability coefficient (cm s), hydrostatic pressure resistance (mpa).

It's pretty much the same as the previous two, but hopefully the detailed explanation will make it clearer for you.

There is a special national standard GBT17642-1998

I produce geomaterials.