Mechanical and Microscopic Properties of Cement Composite Expansive Soil with Graphene Oxide: Ecofriendly Modification Material
Publication: International Journal of Geomechanics
Volume 23, Issue 6
Abstract
Cement composite soil is a more stabilized method in expansive soil foundation projects, but it is essential to find an ecofriendly modification material to reduce the content of cement and its pollution for the environment. A series of unconsolidated–undrained (UU) triaxial tests were conducted to investigate the modification effect of graphene oxide (GO) on cement-stabilized expansive soil (CS), and the contents of GO were 0.05%, 0.1%, 0.15%, and 0.2%, respectively. The test results show that (1) the deviatoric stress–strain curves of CS gradually change from a weakly softening type to a strongly softening one after adding GO. (2) The compressive strength, shear strength, and toughness of GO-modified cement-stabilized expansive soil are better than CS, and the optimal GO content is 0.05%. (3) Microscopic tests show that GO can promote the hydration reaction of cement and reduce the internal pores of CS. Consequently, the mechanical properties and microstructure of CS can be significantly improved after adding GO, and it is feasible to replace a part of the cement with GO in expansive soil foundation projects.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant Number 52179107), the China Scholarship Council (201607910002), and the Science and Technology Project of Jiangsu Provincial of Traffic Engineering Construction Bureau.
Notation
The following symbols are used in this paper:
- c
- cohesion (MPa);
- q
- deviatoric stress (MPa);
- qc
- compressive strength (MPa);
- qp
- peak deviatoric stress (MPa);
- W
- toughness index (MPa);
- α
- failure angle (°);
- αp
- predicted failure angle (°);
- ɛ
- axial strain (%);
- σ
- normal stress (MPa);
- σ3
- confining pressure (MPa);
- τ
- shear strength (MPa); and
- φ
- angle of internal friction (°).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 3, 2022
Accepted: Jan 24, 2023
Published online: Apr 11, 2023
Published in print: Jun 1, 2023
Discussion open until: Sep 11, 2023
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