Evaluation of a sand bentonite mixture as a shaft/borehole sealing material

AKGÜN H., KOÇKAR M. K.

APPLIED CLAY SCIENCE, cilt.164, ss.34-43, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 164
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.clay.2017.12.043
  • Dergi Adı: APPLIED CLAY SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.34-43
  • Anahtar Kelimeler: Compacted sand bentonite mixture, Mechanical and hydrological evaluation, Hydraulic conductivity, Unconfined compressive strength, Shear strength, Waste disposal, FUEL WASTE-DISPOSAL, HYDRAULIC CONDUCTIVITY, COMPACTED CLAY, BACKFILL, PERMEABILITY, LINERS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The mechanical and hydrological characteristics of compacted sand bentonite mixtures with bentonite contents ranging from 5 to 40% were investigated in the laboratory in order to assess their use as a waste isolation material and to select an optimum sand bentonite mixture. Laboratory tests included compaction, compaction permeability, unconfined compression and direct shear tests which led to a recommendation to select a mixture with a bentonite content of 30% for the isolation of underground geological waste disposal repositories. This study complements the previous studies of the authors of this manuscript by determining the mechanical and hydrological properties of sand bentonite mixtures that possess bentonite contents > 30% to determine the geotechnical properties (i.e., unconfined compressive strength, Young's modulus, cohesion and angle of internal friction) and the mechanical behavior of these relatively high levels of bentonite mixtures for the first time in the literature.