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® extrapolation with time temperature superposition principals. Creep <br />rupture testing is required on representative samples of the finished <br />product and not a single component of the geogrid (e.g., fiber and/or yarn). <br />Creep rupture testing that has been performed through the use of <br />alternative techniques (e.g., stepped Isothermal Method) must be <br />supported with Creep rupture data conducted for a minimum of 10,000 <br />hours at 20 degrees C. <br />In no event shall the minimum value of FSCR be less than 2.3 for HDPE <br />uniaxial geogrid <br />The load applied for the test duration must equal or exceed the percentage <br />of ultimate representing the creep rupture strength of the product. The <br />percentage of ultimate is defined as the inverse of the FSCR or 1/FSCR. The <br />ultimate strength used in this calculation shall be that of the roll used in <br />the testing and not the MARV for the product. <br />C. RFID Reduction Factor for Installation Damage shall be determined from <br />construction damage tests for each product proposed in accordance with <br />ASTM D5818-95. Tests shall be conducted using the actual backfill from <br />the project. However, in lieu of such testing, the Manufacturer can supply <br />test results from other backfill soils if such soils can be shown to result in <br />more severe construction damage than the proposed backfill. Testing shall <br />be consistent with ASTM D5818-95. <br />d. RFD - Reduction Factor for Durability/Aging is the combined partial factor <br />for potential chemical and biological degradation. RFD shall be determined <br />from polymer specific (HDPE and PP as identified by their mechanical <br />properties, and PET as identified by CEG number and number average <br />molecular weight, Mn) durability testing covering the range of expected <br />soil environments. Polyolefin geogrids can be used in a pH range from 2 to <br />12, and polyester geogrids can be used within a pH range of greater than 3 <br />and less than 9. The minimum Reduction Factor for Durability/Aging for <br />HDPE and PP shall be 1. <br />• Forward Landfill WMU FU -13 <br />02779 <br />