ARCHIVED REPORTS_2006_4 - Laserfiche WebLink

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nonwoven geotextiles. The bentonite shall be a high quality, natural sodium bentonite composed of a minimum of 90 percent montmorillonite, by dry weight, when tested with X-ray diffraction methods. 2. The GCL shall be internally reinforced through a process such as needle punching through the top and bottom layers of geotextile and the bentonite. The reinforcing fibers shall be a polypropylene thread. The tensile strength of the fibers shall not be affected by hydration with water. 3. Prior to packaging the finished product, the manufacturer shall inspect each roll, over the entire surface area, for the presence of sewing needles. All needles shall be removed or the rolls shall be rejected. 4. The bentonite will be adhered to the backing material in a manner that prevents it from being dislodged when transported, handled, and installed in a manner prescribed by the manufacturer. The water content of the bentonite shall not be greater than eitherl2 percent, by weight, or the initial moisture content measured at the time of passing conformance shear strength tests. 5. The interfacial and internal shear strength of the side slope liner system will be tested per ASTM D6243 and ASTM D5321 to post -peak conditions. Post -peak conditions are defined as the point at which the applied shear force remains constant with increasing shear displacement. The minimum post -peak shear displacement shall be 3 inches. In testing, upper or lower boxes can be interchanged depending on the type of equipment. Submit, one each, 6"x6" coupons of geomembrane and GCL from the rolls of material that were used for each test. Testing shall be performed such that orientation of materials being tested (i.e. which side is up) is consistent with orientation of installation in the field. a. The QA/QC CONSULTANT shall perform the shear strength testing per ASTM D6243 for the proposed liner system components (GCL vs. geomembrane and protective operations layer soil) in accordance with the following: 1) Measure initial moisture content of the bentonite component of the GCL. 2) Measure the asperity of the geomembrane [GRI GM -12]. 3) Hydrate GCL under 125 psf normal stress for 20 hours with distilled water. 4) Anchor lower geotextile component of site-specific GCL to lower shear box. The upper geotextile component of GCL shall not be anchored to the box. The GCL test shall be assembled the same way as the materials will be deployed in the field. 5) Spray upper surface of GCL with water. Forward Landfill WMU FU -06 5 GEOSYNTHETIC CLAY LINER (GCL) 02777