Combined influence of subsoil water content and mass per unit area on cation exchange behavior of geosynthetic clay liners

Karakus Y., Taskesti B. E., ÖREN A. H.

GEOTEXTILES AND GEOMEMBRANES, cilt.50, sa.1, ss.174-182, 2022 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 50 Sayı: 1
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.geotexmem.2021.10.002
  • Dergi Adı: GEOTEXTILES AND GEOMEMBRANES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Compendex, Geobase, INSPEC, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.174-182
  • Anahtar Kelimeler: Cation exchange, GCL, Hydration, Mass per unit area (MPUA), Subsoil water content, Swell index, HYDRAULIC CONDUCTIVITY, ION-EXCHANGE, HYDRATION, GCL, DESICCATION, PERFORMANCE
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Hydration tests were performed on geosynthetic clay liners (GCL) to examine the influence of subsoil water content (w(subsoil)) and mass per unit area (MPUA) on the cation exchange occurred during hydration. Increase in the W-su(bso)il increased the final water content of GCL (w(final)). At MPUA of 4.0 kg/m(2), w(final) increased from 70 to 109%. Such increase was less pronounced when MPUA was considered. Also, an inverse relation between MPUA and w(final) existed where w(final) increased as the MPUA decreased. The greatest w(final) was determined when W-subsoil was similar to 17% and MPUA of GCL was similar to 3.0 kg/m(2) (112%). The exchange reaction was the most favorable when W-subsoil was similar to 8% and MPUA of GCL was similar to 3.0 kg/m(2) (mole fractions of monovalent cations, X-M, decreased from 0.81 to 0.65) and the least favorable when w(subsoil) was similar to 17% and MPUA of GCL was similar to 3.0 kg/m(2) (X-M decreased from 0.81 to 0.80). Combined influence of MPUA and W-subsoil showed that although cation exchange depends on both factors, w(subsoil) had significant role in this reaction more than MPUA. The findings of cation exchange analyses were supported with swell index tests. The hydrated GCLs had lower swell indices than the virgin GCL (17.5-19.0 mL/2g vs. 21.5 mL/2g), indicating cation exchange.