A comparison of hydraulic conductivity between cast and undisturbed samples for a cement bentonite soil slurry wall backfill

Author

Charles Aden Skouby

Abstract

"A cement bentonite and soil slurry wall was installed through a river levee to prevent horizontal seepage during high river levels. The maximum allowable hydraulic conductivity of the backfill was 1.0 x 10^-6 cm/s at 28 days of curing. Two types of samples were taken and tested for hydraulic conductivity. Bulk samples of the backfill were cast prior to hardening and undisturbed samples were taken from the trench after the backfill had hardened.

The bulk samples typically had a hydraulic conductivity of 5.0 x 10^-7 cm/s or lower while the undisturbed samples displayed a hydraulic conductivity which was greater than 1.0 x 10^-6 cm/s.

The influence of curing conditions and sampling disturbance on the hydraulic conductivity was examined in this study. Several large specimens were cast using a backfill soil mix similar to the backfill used on the project. The specimens were sampled using standard Shelby tubes. The hydraulic conductivity of the tube samples were compared to 3 in. (7.6 cm.) diameter by 6 in. (15.2 cm.) tall cast samples. The tests indicated that the curing environment had little effect on the hydraulic conductivity and that sampling disturbance was the primary cause for the difference in hydraulic conductivity between the undisturbed and cast samples"--Abstract, page iii.

Advisor(s)

Stephenson, Richard Wesley

Committee Member(s)

Lentz, Rodney
Elifrits, C. Dale

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Publisher

University of Missouri--Rolla

Publication Date

Summer 1995

Pagination

viii, 42 pages

Note about bibliography

Includes bibliographical references (pages 40-41).

Rights

© 1995 Charles Aden Skouby, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Bentonite slurry -- Testing
Soil cement -- Curing -- Testing
Soil permeability -- Testing

Thesis Number

T 6974

Print OCLC #

32849871

Electronic OCLC #

960853117

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

Recommended Citation

Skouby, Charles Aden, "A comparison of hydraulic conductivity between cast and undisturbed samples for a cement bentonite soil slurry wall backfill" (1995). Masters Theses. 4375.
https://scholarsmine.mst.edu/masters_theses/4375