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Title: Hydraulic conductivity of desiccated geosynthetic clay liners

Abstract

Large-scale tests were performed to determine the effect of a cycle of wetting and drying on the hydraulic conductivity of several geosynthetic clay liners (GCLs). The GCLs were covered with 0.6 m of pea gravel and permeated with water. After steady seepage had developed, the water was drained away, and the GCL was desiccated by circulating heated air through the overlying gravel. The drying caused severe cracking in the bentonite component of the GCLs. The GCLs were again permeated with water. As the cracked bentonite hydrated and swelled, the hydraulic conductivity slowly decreased from an initially high value. The long-term, steady value of hydraulic conductivity after the wetting and drying cycle was found to be essentially the same as the value for the undesiccated GCL. It is concluded that GCLs possess the ability to self-heal after a cycle of wetting and drying, which is important for applications in which there may be alternate wetting and drying of a hydraulic barrier (e.g. within a landfill final cover).

Authors:
 [1];  [2]
  1. CH2M Hill, Oakland, CA (United States)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
OSTI Identifier:
207865
Resource Type:
Journal Article
Journal Name:
Journal of Geotechnical Engineering
Additional Journal Information:
Journal Volume: 122; Journal Issue: 3; Other Information: PBD: Mar 1996
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE; SANITARY LANDFILLS; LINERS; HYDRAULIC CONDUCTIVITY; MATERIALS TESTING; BENTONITE; WATER INFLUX

Citation Formats

Boardman, B T, and Daniel, D E. Hydraulic conductivity of desiccated geosynthetic clay liners. United States: N. p., 1996. Web. doi:10.1061/(ASCE)0733-9410(1996)122:3(204).
Boardman, B T, & Daniel, D E. Hydraulic conductivity of desiccated geosynthetic clay liners. United States. doi:10.1061/(ASCE)0733-9410(1996)122:3(204).
Boardman, B T, and Daniel, D E. Fri . "Hydraulic conductivity of desiccated geosynthetic clay liners". United States. doi:10.1061/(ASCE)0733-9410(1996)122:3(204).
@article{osti_207865,
title = {Hydraulic conductivity of desiccated geosynthetic clay liners},
author = {Boardman, B T and Daniel, D E},
abstractNote = {Large-scale tests were performed to determine the effect of a cycle of wetting and drying on the hydraulic conductivity of several geosynthetic clay liners (GCLs). The GCLs were covered with 0.6 m of pea gravel and permeated with water. After steady seepage had developed, the water was drained away, and the GCL was desiccated by circulating heated air through the overlying gravel. The drying caused severe cracking in the bentonite component of the GCLs. The GCLs were again permeated with water. As the cracked bentonite hydrated and swelled, the hydraulic conductivity slowly decreased from an initially high value. The long-term, steady value of hydraulic conductivity after the wetting and drying cycle was found to be essentially the same as the value for the undesiccated GCL. It is concluded that GCLs possess the ability to self-heal after a cycle of wetting and drying, which is important for applications in which there may be alternate wetting and drying of a hydraulic barrier (e.g. within a landfill final cover).},
doi = {10.1061/(ASCE)0733-9410(1996)122:3(204)},
journal = {Journal of Geotechnical Engineering},
number = 3,
volume = 122,
place = {United States},
year = {1996},
month = {3}
}