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 flow. This e-book presents authoritative information on trying out of geomembranes. it's been ready by means of a global committee of specialists lower than the auspices of RILEM, the overseas Union of analysis and trying out Laboratories for fabrics and Structures.
summary: Geomembranes are more and more getting used in transportation, environmental and geotechnical purposes to manage gasoline and liquid circulation. This booklet offers authoritative suggestions on trying out of geomembranes. it's been ready through a world 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 info for Geomembranes - Identification and Performance Testing
At this stage of development of the apparatus, more data are needed to consider welding succesfully thinner and thicker HDPE sheets. Finally, the performance life of the horns is limited because of polymer sticking on it and consequently must be changed periodically. 3–3 WELDING PARAMETERS The quality of a geomembrane field seam depends on many factors related to the membrane itself, the atmospheric conditions, the project design and the welding technique used. The geomembrane parameters influencing the welding conditions are its compounding (specific gravity, carbon black content and melt index), its thickness, its surface neatness (presence of greases, water or soil particles) and the seam width.
5 Ultrasonic technique The ultrasonic technique is a welding method introduced recently on the market. Polyethylene and polyvinyl chloride can be melted using ultrasonic waves. Under resonnance, a metallic horn in contact with a geomembrane can produced enough energy by friction to melt the polymer. Upon the vibration frequency of the horn, usually between 20 to 40 KHz, the interface of a sheet can be melted. The technique consists in placing an ultrasonic horn between the two sheets in such a way as to maintain a contact between the horn and the sheets.
Finally, a surface cleaning treatment (grinding and hot air) is often used to prepare the welding area in order to increase the machine performance. 1 shows a weld thicker than the ones produced by hot air and hot wedge techniques. 6 times a single sheet tickness. The welding speed depends strongly on the sheets thickness and temperature and the on site atmospheric conditions. 0 mm. The large and heavy machines are excellent to perform longitudinal seams but are not usually used for repairs works, patches, at corners and at connecting areas.