By J-M.Rigo, J.M. Rigo, A.L. Rollin
Geomembranes are more and more getting used in transportation, environmental and geotechnical functions to manage gasoline and liquid flow. This booklet offers authoritative advice on trying out of geomembranes. it's been ready by way of a world committee of specialists lower than the auspices of RILEM, the overseas Union of analysis and checking out Laboratories for fabrics and Structures.
summary: Geomembranes are more and more getting used in transportation, environmental and geotechnical functions to regulate fuel and liquid stream. This ebook presents authoritative tips on checking out of geomembranes. it's been ready by way of a global committee of specialists lower than the auspices of RILEM, the overseas Union of study and checking out Laboratories for fabrics and buildings
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Extra resources for Geomembranes - Identification and Performance Testing
4 Cyclic movements It is a test to control the ability of the geomembrane to bridge cracks. Geomembranes are glued on 2 concrete supports distant of 1 mm. The two concrete substrates have a relative alternate movement, in order to simulate the opening and closing of the crack. The deformation rate and the amplitude are depending from the different constitutive materials. The number of cycles is: 500 for nonaged specimens; 200 for aged specimens. The test is usually performed at 0°C. 15 Direct shear test device to evaluate the geomembrane-soil friction (from Van Zanten, 1986) The UEAtc directives describe the procedure of this test (UETtc, 1982).
2). 9 Tear test on bituminous geomembranes Fig. 1 Tear test The tear test procedures and specimen sizes depend from the nature of the constitutive material and from the type of tearing considered. 9), according to the procedure described by UEAtc, 1982. The displacement rate of the clamp is 100 mm/min. For polymeric geomembranes, tear resistance can be evaluated according to two different approaches: tear initiation and tear propagation. 10. The test procedure is standardized by ASTM D 1004–81 for thermoplastic geomembranes and by ASTM D 624–86 (die C) for elastomeric geomembranes.
3 Flexibility at low temperature (according to UEAtc, 1982) analysis of the degree of ageing, for instance for the determination of the oxydation in a HDPE, or of the percentage of polymer in a modified bitumen. , 1990). 7 Differential scanning calorimetry (DSC) A small geomembrane specimen (few miligrams) is subjected to a thermal flow. 4). A DSC analysis gives: percentage of crystallinity (ASTM D3417–82), if the geomembrane is semicrystalline; melt temperature (ASTM D3417–82); melt enthalphy (ASTM D3417–82); glass transition temperature (ASTM D3418–82); post-polymerisation; decomposition (or oxydation) of the product; oxydation stability.