GCL-4 consists of a layer of bentonite encapsulated between two geotextiles (a nonwoven and a woven polypropylene geotextiles), needle punched together and laminated on one side to a polyethylene membrane for maximum performances under a wide variety of field conditions. This integrated matrix of bentonite and needle punched fibers provides high shear strength and allows the GCL-4 to keep low permeability even in presence of adverse installation conditions. The GCL-4 has high internal shear strength characteristics for steep slope applications.
GCL-4 is designed for below-grade vertical and horizontal structural foundation surfaces. Typical cast-in-place concrete applications include backfilled concrete walls, earth-covered roofs, structural slabs, tunnels, and property line construction. Property line construction applications include soldier pile and lagging, metal sheet piling, shotcrete and stabilized earth retention walls. Applications may include structures under continuous or intermittent Hydro-static pressure. Where contaminated ground-water or salt-water conditions exist, use GCL-4 with contaminant resistant sodium bentonite. GCL-4 resists higher levels of the following contaminant’s: nitrates, phosphates, chlorides, sulfates, lime and organic solvents.
| ■ Catalog of geosynthetices clay liner |
Our GCL have two kind of types that are GCL-NP and GCL-OF. The GCL-NP type are consisted of three layers, the top is nonwoven geotextile, the middle is sodium bentonite, and the bottom is woven geotextile. This type GCL is widely used in landfill, lagoon, river bottom, and basement and so on. The GCL-OF have four layers including the introduced three layers, which have one additional HDPE membrane bonded with the nonwoven geotextile to form the compound waterproofing layer. This kind GCL is widely used in subway, basement, tunnel, and other underground projects and salt water area and harsh environment.
| Model | GCL-3 | GCL-4 | GCL-5 | CUSTOMIZED | COMMENTS |
| Photo |  |  |  |  |
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| Weight of bentonite granular | 3000g-7000g/m2 | 3500g-7500g/m2 | 4000g-10000g/m2 | 4000g-10000g/m2 | Can be customized as required |
| Water content | 8-12% | 8-12% | 8-12% | 8-12% | |
| thickness | 5-7mm | 5-8mm | 6-10mm | 5-8mm | |
| Thickness of HDPE liner | No liner | 0.1-0.5mm | No liner | 0.1-0.5mm | |
| Swell index of bentonite granular | ≥24 | ≥24 | ≥24 | ≥24 | 24,25,26,27 |
| nonwoven geotextile | Weight | 180-300g/m2 | 180-300g/m2 | 180-300g/m2 | 180-300g/m2 | |
| Polypropylene or po | PP and PET or customized | PP and PET or customized | PP and PET or customized | PP and PET or customized | Percentage of PP can be customized |
| Wonven fabric | Material | Polypropylene | Polypropylene | Polypropylene | Polypropylene | |
| Weight | 110g, 130g, 150g | 110g, 130g, 150g | 110g, 130g, 150g | 110g, 130g, 150g | Usual stock is 130g/m2 and other weight needs to be customized |
| Woven method | Circular or plain | Circular or plain | Circular or plain | Circular or plain | |
| Tensile strength | ≥600N/100mm | ≥800N/100mm | ≥800N/100mm | ≥600N/100mm | |
| Peel strength | ≥40N/10cm | ≥50N/10cm | ≥40N/10cm | ≥40N/10cm | |
| Permeability coefficient(cm/s) | ≤5.0×10-11 | ≤5.0×10-11 | ≤5.0×10-11 | ≤5.0×10-11 | |
| Water resistant static pressure(0.4mpa, 1h) | No leakage | No leakage | No leakage | No leakage |
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| ■ Specification of the GCL properties Test method Unit values bentonite geotextile with PE coating |
| properties | Test method | Unit | values |
| 1.Geotextile layers: cover layer PP Nonwoven |
| 1.1 mass per unit area | ENISO 9864 | g/sqm | >200 |
| Carrier layer: PP woven |
| 2.1 mass per unit area | ENISO 9864 | g/sqm | 130 |
| 2.2 mass per unit area for PE coating | ENISO 9864 | g/sqm | ≥100 |
| Bentonite layer: sodium bentonite granule |
| 3.1 mass per unit area | EN 14196 | g/sqm | ≥3600 |
| 3.2 swell index | ASTM D5890 | ml/2g | ≥24 |
| 3.3 fluid loss | ASTM D 5891 | Ml | <18 |
| Geosynthetic clay liner: |
| 4.1 mass per unit area: | EN14196(clay +geotextile) | g/sqm | ≥3900 |
| 4.2 thickness | EN ISO9863-1 | Mm | >6.0 |
| 4.3 max tensile strength, md/cmd | ENISO10319 | KN/M | ≥7.0/7.0 |
| 4.4 peel strength | ASTM D6496 | KN/M | ≥360 |
| 4.5 Permeability coefficient | EN14150 | m/s | ≤5.0×10-10 |
GCL-OF
