A Clay-Based Geopolymer in Loess Soil Stabilization
Open accessAbstract
Soil erosion has environmental and socioeconomic significances. Loess soils cover about 10% of the global land area. Most of these soils are subjected to increased land uses such as unpaved roads, which increase soil destruction and dust emission to the atmosphere. There is a significant interest in applications for dust control and soil stabilization. Application of geopolymers may significantly reduce environmental impacts. This study examines the use of a metakaolin-based geopolymer for dust control and soil stabilization in a semi-arid loess soil. The application of the geopolymer for dust control in comparison with common products (brine, bitumen, polyvinyl acetate-PVA) resulted in no dust emission. As a soil stabilizer, the geopolymer tested in this study provides remarkably good results in the tensile test. The most successful composition of the geopolymer, which is activation solution of sodium silicate and sodium hydroxide (NaOH) together with an addition of 30% metakaolin, obtained soil strength of 23,900 N after 28 days. The attempt to replace NaOH with lime (CaO) in the activation solution was far inferior to the original composition. There is a strong potential to develop natural soil stabilizers from a mineral base that even surpass their capabilities over existing synthetic stabilizers.
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In order to produce geopolymer, the sources of alumina and silica (fly ash and GGBFS) act as precursors that are easily dissolved in alkaline solutions resulted from alkaline activation, making geopolymerization possible.
“In order to produce geopolymer, the sources of alumina and silica (fly ash and GGBFS) act as precursors that are easily dissolved in alkaline solutions resulted from alkaline activation, making geopolymerization possible [47,49,57,58,60,61,62,63,64,65,66,67,68].”
From Potential of Soil Stabilization Using Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash via Geopolymerization Method: A Review (2022) · cites this paper as [49]
The Introduction (page not provided) says geopolymers can be synthesized from calcined kaolin and a strongly alkaline solution, and mentions fly ash among materials used in loess stabilization. It does not identify GGBFS as a precursor or explain dissolution of alumina and silica as the mechanism of geopolymerization. (LLM, conf=0.82)
Experimental — accuracy not yet measuredManufacturing conventional soil stabilizers such as cement and lime results in considerable CO2 and energy emissions.
“The manufacturing of conventional soil stabilizers such as cement and lime results in considerable CO2 and energy emissions [47,48,49].”
From Potential of Soil Stabilization Using Ground Granulated Blast Furnace Slag (GGBFS) and Fly Ash via Geopolymerization Method: A Review (2022) · cites this paper as [49]
The Introduction discusses the environmental footprint of dust-control products but says it is unclear; it does not address emissions from manufacturing cement or lime. The Conclusions mention production costs for geopolymer ingredients, not CO2 emissions or energy use. Searches for cement and lime manufacturing, CO2, and energy emissions found no passage establishing the claim. (LLM, conf=0.73)
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Research works printed but not linked: 24
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- Kok, J.F. A scaling theory for the size distribution of emitted dust aerosols suggests climate models underestimate the size of the global dust cycle. Proc. Natl. Acad. Sci. USA 2010, 108, 1016-1021. [CrossRef] [PubMed] · DOI
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Cited by
Sorted by citations
Abdila, S. R., Abdullah, M. M. A. B., Ahmad, R., Burduhos Nergis, D. D., Rahim, S. Z. A., Omar, M. F., Sandu, A. V., Vizureanu, P., & Syafwandi (2022) · Materials · doi:10.3390/ma15010375 · Cited by 140 · see citing works
- Authors
- Hanegbi, N., & Katra, I.
- Affiliations
- Ben-Gurion University of the Negev (IL)
- Corresponding author
- Katra, Itzhak
- ORCID
- Katra, Itzhak
- Venue
- Applied Sciences
- Publisher
- MDPI AG
- Published
- 2020-04-10
- Volume
- 10
- Issue
- 7
- Pages
- 2608
- ISSN
- 2076-3417 (ISSN-L)
- OpenAlex
- W3017116674
- Cited by
- 36
- References
- 0
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 4 · 2023: 10 · 2022: 7 · 2021: 2 · 2020: 2 · 2012: 1
- FWCI
- 2.99
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Applied Sciences (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical Engineering and Soil Stabilization
- Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
- Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical and construction materials studies
- Keywords
- geopolymer, loess soils, soil stabilization, dust control, metakaolin, sodium silicate, sodium hydroxide activation, tensile strength, soil erosion, semi-arid soils, dirt roads, lime activation
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