عنوان

Clay dispersion:

Number

TLpq304090170

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Clay dispersion:

General Material Designation

[Thesis]

First Statement of Responsibility

M. A. Ijhaish

Title Proper by Another Author

Implications to clay barriers' long-term performance

Subsequent Statement of Responsibility

S. C. Cheung

Name of Publisher, Distributor, etc.

Concordia University (Canada)

Date of Publication, Distribution, etc.

1993

Specific Material Designation and Extent of Item

196

Dissertation or thesis details and type of degree

M.A.Sc.

Body granting the degree

Concordia University (Canada)

Text preceding or following the note

1993

Text of Note

The long-term performance of clay barriers is of great importance in geo-environmental projects dealing with the disposal of high-level radioactive waste. The main objective of this thesis is to address the long-term performance of clay barrier proposed for use in the Canadian Nuclear Fuel Waste Management Program. To achieve this objective, it is necessary to accomplish two primary objectives. In addition, concepts in clay colloid chemistry of relevance to this study are reviewed. The first primary objective is to study the effect of pore water chemistry on the flocculation/deflocculation of clay particles at clay water interface. This is accomplished experimentally by comparing the results of critical coagulation concentrations and sediment volumes of a 2% bentonite clay suspension in NaCl & CaCl2 and synthetic solutions used in the sedimentation tests. The second primary objective is to study the rate of release of clay particles from the expanding clay in various solutions. This is accomplished by measuring the concentration profiles as a function of time from the expanding clay in various solutions. Results obtained from the above two achieved objectives suggest that the bentonite gel is flocculated and the amount of particles released is insignificant. The unexpected result of no particle release from the gel in the distilled water is attributed to the presence of residual salt in the clay. The results also support the long-term performance of the bentonite clay barrier proposed for use in the Canadian Nuclear Fuel Waste Management Program.

Applied sciences

Civil engineering

M. A. Ijhaish

S. C. Cheung

Electronic name

p

[Thesis]

276903

a

Y