Evaluation of Performance of Polyacrylamide-Modified Compacted Clay as a Gas Barrier: Water Retention and Gas Permeability and Diffusion Characteristics

In this paper, the performance of a gas barrier that consisted polyacrylamide (PAM)-modified compacted clayey soil was experimentally explored. The moisture content and water loss characteristics tested soils were adopted as indicative indices retention capacity (WRC). permeability (Kp) diffusion coefficient (Dp) modified clays evaluated via tests. test results showed clay samples subjected to drying tests increased with increasing content. Kp Dp decreased PAM Compared 0.2% content, sample 1.0% reduced by ten times, ~35%. unmodified clay, liquid limit PAM-modified 45~55%. Comparison between study previous studies revealed ratio zwitterionic (ZP)-modified much higher than other material-modified soils. are useful facilitate application materials at industrial contaminated sites.