Dissertation
Critical state framework for interpretation of geotechnical properties of cement treated soils
Washington State University
Doctor of Philosophy (PhD), Washington State University
08/2008
DOI:
https://doi.org/10.7273/000005862
Abstract
This study examines the effectiveness of cement treatment on geotechnical properties of soils from Aberdeen, Everett, and Palouse regions from the state of Washington. The addition of cement was found to improve the drying rate and compaction characteristics of the soils. Significant improvement in unconfined compressive strength and modulus of elasticity are attained by cement treatment of these soils. Results of undrained triaxial tests showed that while cement treatment improved shear strength significantly, the type of failure behavior varied greatly. Non-treated, 5%, and 10% cement treated soils displayed ductile, planar, and splitting type of failure, respectively. For 10% cement treated soils pore pressures raised rapidly to confining pressures resulting in zero effective confining pressure at failure. Consequently, specimens split vertically. Therefore, while increase in strength can be achieved by cement treatment, high percentages of cement should be used with extreme caution in field applications. Mohr-Coulomb and Johnston failure criteria were applicable to predict shear strength of non-treated and 5% cement treated soils while Griffith and modified Griffith found to be applicable for non-treated, 5% and 10% cement treated soils. The results of triaxial tests on Aberdeen soil were interpreted using the critical state framework. As a result of cement treatment interlocking increased, critical state friction remained constant and soils displayed anisotropic behavior. The anisotropic model presented by Muhunthan and Masad (1997) was used to predict the undrained stress path. A combination of this model with extended Griffith theory can be used to predict the complete shear behavior of cement treated soil in q-p' space. The main contributions of this study to practice are quantifying improvement in mechanical behavior due to cement treatment and highlighting the fact that higher percentages of cement could turn stabilization from beneficial to an extremely dangerous practice.
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Details
- Title
- Critical state framework for interpretation of geotechnical properties of cement treated soils
- Creators
- Farid Sariosseiri
- Contributors
- Balasingam Muhunthan (Chair)RICHARD J WATTS (Committee Member)Adrian Rodriquez-Marek (Committee Member)Shihui Shen (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Civil and Environmental Engineering
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 165
- Identifiers
- 99901055034901842
- Language
- English
- Resource Type
- Dissertation