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Waste Management & Research
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Techniques for the Fabrication of Geomembrane Filled Seams

David A. Carson

Risk Reduction Engineering Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268, U.S.A.

Robert E. Landreth

Risk Reduction Engineering Laboratory, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268, U.S.A.

Geomembranes employed to overlay the excavation for landfills must be seamed together on-site at the landfill. To ensure the integrity of the containment system of the landfill, these sheets or blankets must be carefully seamed. Present methods in common use are: extrusion fillet welding, where the extrudate is placed over the edge of the seam; extrusion flat welding, where the extrudate is placed between the two sheets to be joined; hot wedge seaming, a thermal fusion bonding, where an electrically heated wedge melts the sheets to be joined, after which a roller applies pressure to ensure the seal; hot air seaming, where hot air between the sheets melt the surfaces to be joined; chemical fusion, where a liquid chemical is applied between the two sheets to be joined; and chemical adhesive, where a dissolved bonding agent (adherent) is applied between the two sheets to be joined. This paper is a review of the technology involved in forming the seams by each method.

Key Words: Sanitary landfill • hazardous waste landfill • geomembrane • seaming • extrusion fillet welding • extrusion flat welding • hot wedge bonding • hot air seaming • chemical fusion • chemical adhesive.

Waste Management & Research, Vol. 10, No. 5, 399-410 (1992)
DOI: 10.1177/0734242X9201000503
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