Seam Examination

by Richard Charron, Project Manager, Mechanical and Conformance Testing Geosynthetics and Polymer Testing; 3050 S.W. 14th Place, Suite 18., Boynton Beach, Fla 33426,

Serial Information: Civil Engineering—ASCE, 1990, Vol. 60, Issue 2, Pg. 61-63

Document Type: Feature article


Charron discusses the importance of seam sampling in geomenbrane installation. In 1988, about 30 million mi of polyethylene geomembranes were used to line landfills, liquid impoundments, heap leach pads and other containment systems. Many engineers are now designing with geomembranes for the first time and are finding that one of the most important aspects of installation is the quality of the seams bonding can range as widely as from 0 to 50% in a typical 500,000 sq ft landfill, depending on crew seaming experience, weather and seam acceptance criteria. Based on his work in geosynthetics and polymer testing, Charron recommends that criteria for geomembranes seam sampling and testing should go beyond the current acceptance criteria recommended by the National Sanitation Foundation. the nation ponders the future of American bridges. In today's designing of bridges, Thomas R. Kuesel points out that light, thin, elastic and graceful are the adjectives come to mind. He worries that old fashioned concepts of stiff, rugged and durable construction are not actively pursued by present day designers. He states the case for a long useful life for bridges and stresses the need for endurability.

Subject Headings: Bridge design | Geomembranes | Bridge tests | Landfills | Bridge foundations | Polyethylene | Water storage | Bonding

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