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01-06-2024 | Original Paper

Swelling characteristics of compacted graphene-modified GMZ bentonite infiltrated with NaCl solution

Authors: Yu-Hao Hu, Yong-Gui Chen, Yu-Cheng Li, Wei-Min Ye, Qiong Wang, Dong-Bei Wu

Published in: Bulletin of Engineering Geology and the Environment | Issue 6/2024

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Abstract

Graphene is regarded as a promising additive to enhance the thermal conductivity of bentonite in the geological repository, yet the hydro-mechanical properties of its mixture with bentonite under chemical conditions remain unclear. This work examined the one-dimensional swelling deformation of high-density graphene-modified bentonite (GMB) in NaCl solutions, considering the influences of graphene content and NaCl concentration. Results indicate that both graphene and NaCl reduced the maximum swelling strain and the primary and secondary swelling coefficients of GMB. Additionally, graphene enhanced the stability of swelling deformation in bentonite across various NaCl concentrations and decreased the GMB’s test duration. The relationship between test duration and NaCl concentration was nonmonotonic. The ratio of swelling strain at each stage to total swelling strain was rarely affected by graphene content or NaCl solution. Scanning electron microscope examinations on selected samples post-swelling tests unveiled a unique soil structure in GMB. Furthermore, a model was put forward to predict the maximum swelling strain of GMB inundated in NaCl solutions, and its feasibility was verified.

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Literature
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Metadata
Title
Swelling characteristics of compacted graphene-modified GMZ bentonite infiltrated with NaCl solution
Authors
Yu-Hao Hu
Yong-Gui Chen
Yu-Cheng Li
Wei-Min Ye
Qiong Wang
Dong-Bei Wu
Publication date
01-06-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 6/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03737-3

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