›› 2007, Vol. 28 ›› Issue (4): 831-835.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Test of ions diffusion in bentonite

HE Jun，SHI Jian-yong，LIAO Zhi-qiang，ZHU Ning   

  1. Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China
  • Received:2005-07-29 Online:2007-04-10 Published:2013-09-05

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Abstract: Bentonite is widely used in landfills. When bentonite is used as a material of liner, diffusion through bentonite is a very important transport mechanism. To understand the ability of retard migration of contaminant in different stress states, the diffusion coefficients of Ca2+，Cl- and Zn2+ diffusing in bentonite of different dry densities were measured. The diffusion coefficients of this study are well in the range of previously published results. With the increasing of porosity, the diffusion coefficients of Ca2+ and Cl- increase in exponential form. The estimating method of diffusion coefficient in a given range of porosity is proposed. The estimation is approximate to the measured values.

Key words: bentonite, diffusion, porosity, diffusion coefficient

CLC Number: 

  • TU 411
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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