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<br /> <br /> <br />Forward Landfill WMU FU-23 5 GEOSYNTHETIC CLAY LINER (GCL) <br />02777 <br />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. <br />a. The QA/QC CONSULTANT shall perform the shear strength testing per ASTM D6243 for the proposed liner system components (GCL vs. geomembrane and geocomposite drainage net) in accordance with the following: <br />1) Measure initial moisture content of the bentonite component of the <br />GCL. <br />2) Measure the asperity of the geomembrane. <br />3) Hydrate GCL under 125 psf normal stress for 20 hours with distilled <br />water. <br />4) Anchor lower geotextile component of site-specific GCL to lower <br />shear box. The upper geotextile component of GCL shall not be <br />anchored to the box. The GCL test shall be assembled the same way <br />as the materials will be deployed in the field. <br />5) Spray upper surface of GCL with water. <br />6) Place the HDPE geomembrane (per Section 02778) above the GCL. <br />The textured side of the HDPE geomembrane shall be facing down <br />and shall be placed over the GCL in the lower box. <br />7) Place the geonet side of the geocomposite drainage net against the <br />smooth side of the HDPE geomembrane. The geotextile side of the <br />geocomposite drainage net shall be anchored to the upper box. <br />8) Saturate under test normal stress for 16 hours. Use normal stresses of <br />1,000; 2,500; 6,000; and 12,000 psf. <br />9) Shear at 0.04 in/min per ASTM D6243. <br />10) The testing laboratory should report the interface where deformations <br />are observed, the initial moisture content of the bentonite component <br />of the GCL, and the asperity of the geomembrane.