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原文传递 Evaluating new technologies to limit geomembrane destructive testing

题名：	Evaluating new technologies to limit geomembrane destructive testing
正文语种：	eng
作者：	Evan Andrews;Kenneth R. Daly
摘要：	For almost 40 years, the generally accepted destructive test rate for geomembrane seaming has been one sample for every 500 feet (152 m) of seam. On large projects this leads to hundreds of holes cut into liners that engineers, manufacturers and installers work very hard to make leak proof. With a typical failure rate for most installers in the 1%-2% range, why do we continue to cut and patch perfectly good seams? With modern materials and equipment, is there a way to limit destructive seam testing? In 1987, Thomas Wright authored the Manual of Procedures and Criteria for Inspecting the Installation of Flexible Membrane Liners in Hazardous Waste Facilities (Wright et al.) under contract with the Hazardous Waste Engineering Research Laboratory of the U.S. Environmental Protection Agency (EPA). This appears to be the origin of the one-seam sample in 500 feet (152 m) frequency. Subsequent articles on the topic refer to this work as the industry standard for installation practices and testing. Interestingly, the actual recommendation in the text refers to a minimum of one test per seaming crew per day and only taking destructive samples when there is an insufficient number of construction quality assurance (CQA) inspectors to observe each seaming crew fulltime or when the results of testing nondestructive samples indicate poor seam quality. A review of literature at the time points to using judgment and performance of the installation crew to base sampling frequency on a project-by-project basis. Wright's work in 1987 only states that one test every 500 feet (152 m) of seam is "normally required" (Wright et al.) and is not an absolute.
出版年：	2022
期刊名称：	Geosynthetics
卷：	40
期：	5
页码：	18-25