Investigation of Phosphate Mining Waste for Construction Materials

Ghafoori, Nader; Chang, Wen F.

doi:10.1061/(asce)0899-1561(1993)5:2(249)

Cited by 21 publications

(6 citation statements)

References 2 publications

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“…The incorporation of phosphogypsum into the soil increases the cation exchange capacity (CEC) and reduces the pH. The low pH value for phosphogypsum corroborates the acidic characteristics, which were obtained by Ghafoori & Chang (1993), Rabelo et al (2001) and Parreira et al (2003). Figure 2a shows SEM images of the phosphogypsum.…”

Section: Methodssupporting

confidence: 76%

Effects of the Addition of Dihydrate Phosphogypsum on the Characterization and Mechanical Behavior of Lateritic Clay

Mascarenha¹,

Neto²,

Matos³

et al. 2018

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This paper presents the effect of adding dihydrate phosphogypsum, which is a byproduct of the production of phosphate fertilizers, on the mechanical behaviour of a lateritic clay typical of Brazil's Midwest region. Because of the distinction of the mechanical behaviours of both materials, laboratory experiments were conducted with soil, phosphogypsum and mixtures with 10%, 20% and 50% phosphogypsum content. One-dimensional consolidation, direct shear and scanning electron microscopy (SEM) tests were conducted on optimally compacted specimens to show the effect of the loading time on the mechanical parameters of the materials. Water percolated through the materials was chemically analysed to verify the groundwater level contamination potential due to cation lixiviation in phosphogypsum. The results show that the addition of phosphogypsum to the soil increases the compressibility without significant effect on the strength parameters, and the broken phosphogypsum particles make the mixture deformability depend on the loading time. With this study, one can conclude that the dihydrate phosphogypsum content in geotechnical works must be maintained below 20%, since higher ratios negatively affect the soil mechanical behaviour and ground water contamination potential. This study also presents an option to reuse and dispose of the most commonly produced phosphogypsum type in Brazil.

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Section: Methodssupporting

confidence: 76%

Effects of the Addition of Dihydrate Phosphogypsum on the Characterization and Mechanical Behavior of Lateritic Clay

Mascarenha¹,

Neto²,

Matos³

et al. 2018

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“…Bagade et al, studied the partial replacement of cement by various percentage of phosphogypsum gave good result with concrete specimens [16]. Researches [17,18] on the basic engineering properties of phosphogypsum-based concrete mixtures concluded that the unique properties of dehydrate phosphogypsum under compaction-consolidation can significantly contribute to the compressive strength of concrete mixes. However, with higher percentage of phosphogypsum, the strength of concrete mixtures is affected by the moisture at the time of testing.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial substitution of raw gypsum with thermally treated phosphogypsum on the properties of Portland Pozzolanic Cement

Taher

Amine

Damarany³

2019

Adv. J. Chem. A

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“…On the other hand, a large quantity of phosphogypsum, which is a by-product of the fertilizer industry, is being generated leading to disposal, environmental and health problems. As indicative of its name, "phospho" refers to its industrial origin, and "gypsum" indicates its predominant composition (Ghafoori, Chang 1993). In the recent times, utilization of phosphogypsum as a stabilizer to improve the engineering behavior of expansive soils has been increasingly reported in the literature (Degirmenci et al 2007;Shen et al 2007;James, Pandian 2014;Kumar et al 2014Kumar et al , 2015De Rezende et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Volume Change Behavior of Phosphogypsum Treated Clayey Soils Contaminated With Inorganic Acids – A Micro Level Study

Chavali

Reddy

2018

Journal of Environmental Engineering and Landscape Management

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Soils exhibit undesirable volume changes when exposed to high concentrations of acids, which is manifested most frequently in the beds of foundations of industrial establishments associated with their production or use. However, control of this phenomenon has received less attention than it deserves. This paper aims to investigate the mineralogical and micro-structural changes occurred during the volume change behavior of phosphogypsum treated clayey soils contaminated with sulfuric acid and phosphoric acid solutions. Oedometer test results showed high swelling and low compressibility for acid contaminated soils than that of water. The change in microstructure towards flocculated fabric along with mineralogical transformations are responsible for the volume changes in soils. The mineralogical changes that affected the volume change behavior are discussed with FT-IR, XRD and SEM analysis. Phosphogypsum treatment was found to be effective in controlling volume changes in soils with phosphoric acid, whereas in the case of sulfuric acid found to be futile.

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Investigation of Phosphate Mining Waste for Construction Materials

Cited by 21 publications

References 2 publications

Effects of the Addition of Dihydrate Phosphogypsum on the Characterization and Mechanical Behavior of Lateritic Clay

Effects of the Addition of Dihydrate Phosphogypsum on the Characterization and Mechanical Behavior of Lateritic Clay

Effect of partial substitution of raw gypsum with thermally treated phosphogypsum on the properties of Portland Pozzolanic Cement

Volume Change Behavior of Phosphogypsum Treated Clayey Soils Contaminated With Inorganic Acids – A Micro Level Study

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