EFFECTS OF WATER CONTENT DISTRIBUTION ON HYDRAULIC CONDUCTIVITY OF PREHYDRATED GCLS AGAINST CALCIUM CHLORIDE SOLUTIONS

• KATSUMI TAKESHI

  Graduate School of Global Environmental Studies, Kyoto University

• ISHIMORI HIROYUKI

  Department of Civil Engineering, Ritsumeikan University

• OGAWA ATSUSHI

  Department of Civil Engineering, Ritsumeikan University

• MARUYAMA SATOSHI

  Department of Civil Engineering, Ritsumeikan University

• FUKAGAWA RYOICHI

  Department of Civil Engineering, Ritsumeikan University

Bibliographic Information

Other Title

• Effects of water content distribution on hydraulic conductivity of prehydrated GCLs against calcuium chloride solutions

Abstract

When geosynthetic clay liners (GCLs) are applied as bottom liners at waste containment facilities, they are naturally prehydrated by absorbing moisture in the underlying base layers. In order to evaluate the effects of cations contained in waste leachates, this study investigated the effects of the water content distribution of the GCLs prehydrated with actual soils on their hydraulic conductivities against CaCl₂ solutions. The “prehydration tests”, which were conducted prior to the hydraulic conductivity tests, showed that the water content distribution of the prehydrated GCLs depends on the properties of the GCLs and the base layers. In particular, drastic differences between GCLs with powdered bentonite and GCLs with granular bentonite were observed in the prehydration water content and its distribution. Prehydrated GCLs with powdered bentonite had a higher water content and a more homogenous distribution than those with granular bentonite. The hydraulic conductivity tests showed that most of the prehydrated GCLs exhibit a low hydraulic conductivity of k≈1.0×10^-8 cm/s against CaCl₂ solutions with 0.1-0.5 M. However, GCLs with granular bentonite may be difficult to homogeneously prehydrate and exhibit an unstable hydraulic conductivity, which varies from k=2.9×10^-9 cm/s to k=1.5×10^-6 cm/s. The homogeneity of the water content distribution has been considered an important factor to obtain a required barrier performance under prehydration conditions, which are naturally generated in actual sites.<br>

Journal

• SOILS AND FOUNDATIONS

  SOILS AND FOUNDATIONS 48 (3), 407-417, 2008

  The Japanese Geotechnical Society

Keywords

• chemical resistance
• geosynthetic clay liner
• hydraulic conductivity
• prehydration
• (<b>IGC</b>: D4)

Details

• CRID: 1390001204666552704
• NII Article ID: 110007327344
• NII Article ID: 130004552338
• NII Book ID: AA00700879
• DOI: 10.3208/sandf.48.407
• ISSN: 18811418
• ISSN: 00380806
• HANDLE: 2433/89725
• Web Site: https://api.elsevier.com/content/article/PII:S0038080620304406?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S0038080620304406?httpAccept=text/plain
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10450429
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • NDL-Digital
  • CiNii Articles
• Abstract License Flag: Disallowed