Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)

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Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Authors
Parisa Samadi1, Ali Ghodrati1, Pooria Ghadir2, *, Akbar A. Javadi2
1School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
2Department of Engineering, University of Exeter, Exeter, UK
*Corresponding author. Email: pg454@exeter.ac.uk
Corresponding Author
Pooria Ghadir
Available Online 1 March 2023.
DOI
10.2991/978-94-6463-104-3_12How to use a DOI?
Keywords
Portland cement; Geopolymer; Soil stabilization; Seawater
Abstract

Freshwater supply for stabilizing sandy soils is one of the significant challenges in coastal regions. On the other hand, Ordindary Portland cement (OPC) has several limitations in the exposure to saline environments. Geopolymers, as environmentally friendly soil stabilizers, have been widely used in soil stabilization research. In this paper, the effects of natural seawater (SW) on the mechanical and microstructural properties of Portland cement/geopolymer stabilized sandy soils were studied. The soil samples were prepared with freshwater as reference samples. The impacts of binder type, slag replacement, curing duration, and curing conditions on the mechanical strength of stabilized soil samples were investigated. SEM images were used for microstructural analysis of the geopolymer stabilized soil samples. The results indicated that the use of seawater in stabilizing soil resulted in higher strength development in short-term (28 days) compared to the distilled water-based samples. However, seawater adversely affected the soil’s long-term (90 days) strength. In addition, the strength of slag-based samples was generally higher than the strength of OPC and VA-based samples. Therefore, alkali-activated slag can be a potential replacement for OPC paste in stabilizing sandy soils. The SEM images revealed that using seawater led to the alteration of cementitious gels in comparison to distilled water.

Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)
Series
Atlantis Highlights in Engineering
Publication Date
1 March 2023
ISBN
978-94-6463-104-3
ISSN
2589-4943
DOI
10.2991/978-94-6463-104-3_12How to use a DOI?
Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Parisa Samadi
AU  - Ali Ghodrati
AU  - Pooria Ghadir
AU  - Akbar A. Javadi
PY  - 2023
DA  - 2023/03/01
TI  - Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils
BT  - Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)
PB  - Atlantis Press
SP  - 121
EP  - 129
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-104-3_12
DO  - 10.2991/978-94-6463-104-3_12
ID  - Samadi2023
ER  -