By J-M.Rigo, J.M. Rigo, A.L. Rollin
Geomembranes are more and more getting used in transportation, environmental and geotechnical purposes to manage fuel and liquid move. This booklet presents authoritative assistance on checking out of geomembranes. it's been ready by means of a world committee of specialists lower than the auspices of RILEM, the foreign 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 circulation. This booklet offers authoritative suggestions on checking out of geomembranes. it's been ready via a world committee of specialists below the auspices of RILEM, the overseas Union of study and trying out Laboratories for fabrics and buildings
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Additional info for Geomembranes - Identification and Performance Testing
Cover More traditional tests (such as Taber abrasion apparatus for thermoplastic geomembranes and Pico abrader for elastomeric geomembranes) can also be used to reproduce dry conditions of abrasion. The Taber abrasion tester is described by ASTM D 4060–84, while the Pico abrader is described by ASTM D 2228–83. 3 Thermal ageing A geomembrane may encounter temperatures higher than normal prior to installation, during installation, and during service. Thermoplastic geomembranes, if allowed to be exposed to heat as rolled or folded panels prior to installation, such as being left in the sun, can block or stick together; afterwards, when unfolded, a coated geomembrane may split or an unreinforced geomembrane may tear and become unserviceable.
ASTM D 696 (1979) Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics. ASTM D 746 (1979) Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact. ASTM D 751 (1979) Standard Methods of Testing Coated Fabrics. ASTM D 792 (1979) Standard Test Methods for Specific Gravity and Density of Plastics by Displacement. ASTM D 882 (1983) Standard Test Methods for Tensile Properties of Thin Plastic Sheeting. ASTM D 1004 (1981) Standard Test Method for Initial Tear Resistance of Plastic Film amd Sheeting.
When a geomembrane is heated in an inert atmosphere from room temperature to 600°C at a controlled rate, it will volatilize at different temperatures until only carbon black, carbonaceous polymer residue and ash remain. The introduction of oxygen into the system will burn off the carbonaceous polymer residue and the carbon black. The weight vs. time curve, which can be expressed also vs. temperature, can be used to calculate the polymer and additives content, the carbon black content and the ash content.