D6141-18 – Standard Test Method Technical Guide

ASTM D6141−18 (Reapproved 2022) provides a standardized guide for the preliminary screening of the clay component within Geosynthetic Clay Liners (GCLs) for chemical compatibility with site-specific or synthetic liquids. This short-term screening protocol uses index tests and flux measurements to rapidly indicate whether a liquid may adversely affect the hydraulic performance of the clay barrier. It is explicitly not a replacement for comprehensive performance testing like EPA Method 9100 or ASTM D6766.

📐 Guide Scope and Applicability

This guide covers procedures for evaluating the ability of the clay portion of a GCL to resist change due to liquid exposure. It is strictly limited to short-term screening and does