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Geotechnical Properties and Microstructure of Lime-Fly Ash-Phosphogypsum-Stabilized Soil
Joint Authors
Okonta, Felix N.
Mashifana, Tebogo Pilgrene
Ntuli, Freeman
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-09-02
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The use of industrial waste as a potential stabilizer of marginal construction materials is cost effective.
Phosphogypsum and fly ash are industrial wastes generated in very large quantities and readily available in South Africa.
In order to explore the potential stabilization of vastly abundant expansive soil using larger quantity phosphogypsum waste as a potential modifier, composites with a mixture of lime-fly ash-phosphogypsum-basic oxygen furnace slag were developed.
However because of the presence of radionuclide, it was necessary to treat the phosphogypsum waste with mild citric acid.
The effect of the acid treatment on the geotechnical properties and microstructure of expansive soil stabilized with phosphogypsum-lime-fly ash-basic oxygen furnace slag (PG-LFA-BOF) paste was evaluated, in comparison with the untreated phosphogypsum.
Expansive soil stabilized with acid-treated PG-LFA-BOF paste exhibited better geotechnical properties; in particular, the high strength mobilized was associated primarily with the formation of various calcium magnesium silicide and coating by calcium silicate hydrate and calcium aluminate hydrate.
The soil microstructure was improved due to the formation of hydration products.
The stabilized expansive soil met the specification for road subgrades and subbase.
Stabilization of expansive soils with phosphogypsum, fly ash, and basic oxygen fly ash does not only improve engineering properties of soil but also provides a solution in relation to disposal and environmental pollution challenges.
American Psychological Association (APA)
Mashifana, Tebogo Pilgrene& Okonta, Felix N.& Ntuli, Freeman. 2018. Geotechnical Properties and Microstructure of Lime-Fly Ash-Phosphogypsum-Stabilized Soil. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1115865
Modern Language Association (MLA)
Mashifana, Tebogo Pilgrene…[et al.]. Geotechnical Properties and Microstructure of Lime-Fly Ash-Phosphogypsum-Stabilized Soil. Advances in Civil Engineering No. 2018 (2018), pp.1-9.
https://search.emarefa.net/detail/BIM-1115865
American Medical Association (AMA)
Mashifana, Tebogo Pilgrene& Okonta, Felix N.& Ntuli, Freeman. Geotechnical Properties and Microstructure of Lime-Fly Ash-Phosphogypsum-Stabilized Soil. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1115865
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1115865