GB/T 17642-2008Geosynthetics - Geocomposites made of geononwoven and geomembrance (English PDF)

3.1 Product classification

Geocomposites made of geononwoven and geomembrance can be classified according to the following methods.

- According to substrate. staple fiber needle-punched geocomposites made of geononwoven and geomembrance, filament spunbonded needle-punched geocomposites made of geononwoven and geomembrance;

- According to the membrane material. polyethylene (PE), polyvinyl chloride (PVC), chlorinated polyethylene (CPE) and other geocomposites made of geononwoven and geomembrance;

- According to the structure. one-cloth-one-membrane, two-cloth-one-membrane, one-cloth-two-membranes, two-cloth-two-membranes, multiple-cloth-multiple- membranes and other geocomposites made of geononwoven and geomembrance.

3.2 Specification

The specifications of the geocomposites made of geononwoven and geomembrance are expressed in terms of nominal breaking strength. Width, mass per unit area and membrane thickness are auxiliary specifications, which are designed according to contract regulations and actual needs.

The recommended series of product specifications are as follows.

Nominal strength (kN/m). 5.0, 7.5, 10, 12, 14, 16, 18, 20, etc.

3.3 Code

The code for geocomposites made of geononwoven and geomembrance is as follows.

(1) Substrate and layers. SN - Short-fiber needle-punched nonwoven geotextile substrate; FN - Filament spunbonded needle-punched nonwoven geotextile substrate; m is the number of substrate layers. When the number of layers is 1, m can be omitted;

(2) Membrane material and number of layers. PE, PVC, CPE, etc.; n is the number of membrane layers. When the number of layers is 1, n can be omitted;

(3) Nominal strength (kN/m);

5.4 Determination of breaking strength elongation. according to GB/T 15788.

5.5 Determination of tear strength. according to GB/T 13763.

5.6 Determination of CBR bursting strength. according to GB/T 14800.

5.7 Determination of dynamic perforation (falling cone). according to GB/T 17630.

5.8 Determination of friction coefficient. according to GB/T 17635.1.

5.9 Determination of in-plane water flow. according to GB/T 17633.

5.10 Determination of creep performance. according to GB/T 17637.

5.11 Determination of antioxidant performance. according to GB/T 17631.

5.12 Determination of acid and alkali resistance. according to GB/T 17632.

5.13 Determination of puncture strength. according to GB/T 19978.

5.14 Determination of peel strength. refer to FZ/T 01010; the width of the specimen is

50mm.

5.15 Determination of joint head/joint seam breaking strength. according to GB/T

16989.

5.16 Determination of UV resistance. according to GB/T 16422.1~16422.3.Usually

determine the strength retention rate before and after light. The test time can be selected according to the needs.

5.17 Determination of hydrostatic pressure resistance. according to GB/T 19979.1.

5.18 Determination of permeability coefficient. according to GB/T 19979.2.

5.19 Determination of anti-wear performance. according to GB/T 17636.

5.20 Constant load elongation and constant elongation load. combining with the

determination of breaking strength and elongation according to GB/T 15788.During the tensile test, measure the elongation when the specified load is reached and (or) the strength value when the specified elongation is reached.

6.1 Sampling

Products of the same variety and specification according to the delivery batch number shall be regarded as inspection batches. Randomly select the corresponding number of rolls from a batch of products according to the provisions in Table 4.Sample extraction

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