REP31858 - Laserfiche WebLink

Home Browse Search

i , 1 RgQiired Seam Streneths for Very Low Density Polyethylene (VLDPEI Geomembrane 1 LJ Required Seam Strengths= Type of Test Test Designation 30 mil 40 mil 60 mil Bonded Seam ASTM D 3083 and ASTM D 35 ppi 45 ppi 80 ppi Strength (Shear) .638 Type M-1 Specimen (modified NSF-54) (pounds per inch) Peei Adhesion ASTM D 413 (modified NSF- FTB FTB FTB 54) (pounds per inch) film tear bond* * Film tear bond (FTB) is defined as failure of one of the sheets by tearing, instead of separating from the other sheet at the weld interface area. Each type of test (shear and peel) shall be performed on five replicate specimens with an ' acceptable result being four out of five replicates satisfying the requirements. Tests for peel adhesion shall be in a free condition (not 90° or 180°). Breaks at weld sheet interface (adhesion) are considered anon-FTB (failure). Individual test results shall be documented. Qualifying test results shall be an average value of the five replicate specimens, identifying the range by standazd deviation. A break at the weld sheet interface (adhesion) is considered anon-FTB (failure) while a break through the weld is considered an FTB if the break is ductile and if the streAgth meets the minimum required values; otherwise the break is considered anon-FTB (failure). A test seam sample passes when both specimens have a passing result in pcel and sheaz tests. The test shall be repeated in its entirety when the test seam sample fails (one of the specimens fails in either peel or sheaz mode). When repeated test seam fails, the seaming apparatus or operator for welding shall not be used until deficiencies or conditions are corncted and two consecutive successful field test seams are achieved. When field test seam fails, a destructive sample shall be taken at a minimum of 10-foot either side of the failed sample until the se8m passes the ' deswcdve test. -za