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GCL Overlaying
April 1st, 2025
Q: Can you provide information about overlaying a new GCL on hydrated and damaged GCL? A: This is more complex than one might first think—particularly from the standpoint of instability. The friction angle (ASTM D5321) of hydrated GCL to new GCL might be in the single digits (i.e., 8+/-2 degrees residual or less). Depending on […]
The GMA Techline
October 1st, 2020
Moderated by George R. Koerner Puncture after NDT Q: I would like your opinion on the fate of punctures in the air channel leftover from nondestructive air channel tests (NDTs), specifically in regard to sealing the air channels to prevent leachate or water ingress. We are particularly concerned with this situation on a landfill cover […]
The GMA Techline answers all
August 1st, 2018
UV Weathering of Geotextiles Q: My firm is providing construction quality assurance services for a landfill cell expansion. We are having an issue with our contractor and are going to be in a position of having 8 ounces/square yard (271 g/m2) of nonwoven geotextile exposed for a period of time, which exceeds the seven-day limit […]