Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
CGS-IAH Conf. Niagara Falls 2002 (to be published -confidential) LABORATORY MEASUREMENTS AND PREDICTIVE EQUATIONS FOR
 

Summary: CGS-IAH Conf. Niagara Falls 2002 (to be published - confidential)
LABORATORY MEASUREMENTS AND PREDICTIVE EQUATIONS FOR
GAS DIFFUSION COEFFICIENT OF UNSATURATED SOILS
Mostafa Aachib
Ecole Hassania des Travaux Publics, Casablanca-Oasis, Morocco
Michel Aubertin*, Mamert Mbonimpa
Ecole Polytechnique, C.P. 6079, Montréal, Québec, Canada
* Corresponding Author: michel.aubertin@polymtl.ca
ABSTRACT
Molecular diffusion is an important mechanism for gas transport through soil covers placed over municipal dumps (from
which bio-gas must not escape) and above acid generating mine tailings (where oxygen availability must be controlled).
Gas flux through cover systems depends on the effective diffusion coefficient De of the cover materials. In this paper, the
authors describe a laboratory procedure for oxygen diffusion tests, and present results obtained on different types of porous
materials at various degrees of saturation. The determination of De from experimental measurements is based on analytical
and numerical solutions to the diffusion equations. The measured values of De are compared to values calculated from two
predictive models. A new expression is finally proposed as a simple means of estimating De.
RÉSUMÉ
La diffusion moléculaire est un mécanisme important de transport de gaz à travers les couvertures en sols mises en
place sur les décharges municipales (d'où le bio-gaz ne doit pas s'échapper) et sur les parc à résidus miniers
générateurs d'acide (où la disponibilité de l'oxygène doit être contrôlée). Le flux de gaz à travers les systèmes de

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies