Influence of the calcination temperature of phosphogypsum on the performance of supersulfated cements

Gracioli, Bruna; Luz, Caroline Angulski da; Beutler, Cheila Sirlene; Filho, José Ilo Pereira; Frare, Andreza; Rocha, Janaíde Cavalcante; Cheriaf, Malik; Hooton, RD

doi:10.1016/j.conbuildmat.2020.119961

Cited by 54 publications

(13 citation statements)

References 22 publications

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“…Mixing design. Some experiments and theoretical studies are used [39][40][41] . The mixing ratio of NBFM is determined: the ratio of water to binder material is 0.39, in which the binder material is phosphogypsum and MSWI fly ash, the dosage of glass fiber and sodium sulfate solution was 0.3% and 2.5% of the binder material respectively.…”

Section: Mswi Fly Ash Washing Treatmentmentioning

confidence: 99%

Environmental filling materials based on phosphogypsum powder with municipal solid waste incineration ash

Yin

Guo

Wang

et al. 2023

Sci Rep

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A new building filling materials (NBFM) using phosphogypsum and municipal solid waste incineration (MSWI) fly ash is prepared in this paper. The effects of MSWI fly ash dosage and MSWI fly ash water washing pretreatment on mechanical properties, setting time, metal leaching, hydration products and microstructure of NBFM are analyzed by a range of experimental studies. The results indicate that the mechanical properties, setting time and the density of micro interface of NBFM are optimal when the MSWI fly ash dosage is 3%. The mechanical properties of NBFM rise and the condensation time and leaching concentration of heavy metals decline after washing the MSWI fly ash. With the increase of the curing age, the metal element leaching of NBFM decreases, and when the curing age is 7 days, the solidification effect of NBFM on most metal elements meets the standard of Chinese code (GB5085.3-2007). The feasibility of MSWI fly ash and phosphogypsum as filling materials for building engineering is verified, and the change of macroscopic properties of NBFM is explained as well.

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Section: Mswi Fly Ash Washing Treatmentmentioning

confidence: 99%

Environmental filling materials based on phosphogypsum powder with municipal solid waste incineration ash

Yin

Guo

Wang

et al. 2023

Sci Rep

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“…Therefore, SSC is considered as an alternative to Portland cement [3]. The hydration process of SSC is demonstrated in Equation 1 [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Zhou¹

2022

Ceramics - Silikaty

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The effects of a 0, 0.2 wt. %, 0.6 wt. %, 1.0 wt. %, 1.4 wt. % and 1.8 wt. % calcium hydroxide content on the microstructure and performance of super sulfated cement (SSC) were investigated. The results showed that the setting time of SSC could be reduced by the calcium hydroxide content to less than 7 hours. The variation in the setting time did not affect the working performance of the SSC. The mechanical properties of the SSC can be consistently and gradually enhanced by calcium hydroxide. The SSC, with a 3-day compressive strength of 22.3 MPa and a 28-day compressive strength of 45.1 MPa, was prepared by introducing 0.6 wt. % calcium hydroxide into the system. A microanalysis revealed that the reaction mechanism of the SSC was influenced by the calcium hydroxide, which led to changes in the hydration products as well as the structure. In particular, large amounts of ettringite (AFt) were prompted in the SSC prepared with the raw materials at the early stage. The change in the structure of the hydration products led to a significant improvement in the mechanical properties.

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“…The volume of global production of fluoranhydrite is 4 million tons per year. The radiation-hygienic characteristics of this raw material meet the requirements of sanitary rules and regulations, which makes it possible to consider this material for use in the production of building materials [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Carbon-containing modifier for fluoranhydrite binder

Gordina¹,

Gumenyuk²,

Polyanskikh³

et al. 2022

Nanobuild

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Introduction.In order to widen the functionality of construction and building materials and widespread electrically conductive building constructions, it is highly recommended to reduce cost of the solutions. This can be achieved by replacing binders with the industrial by-products. At the same time, there are a few articles about adjustment of electrically conductive properties of materials based on by-product binders and this field is of a great importance. Also, highly dispersed particles in modifiers and their role might be considered as important to find out, especially when such additives are used to improve structure and properties of composites. Methods and materials. To study the possibility of controlling the electrical properties of the matrix, compositions based on fluoroanhydrite, sodium sulfate as a hardening activator, and UPC-MIX-1 suspension as an electrically conductive additive, were made. The effect of UPC-MIX-1 suspension on the electrical performance and structure formation of a mineral matrix containing dispersed carbon black particles was studied. The polydisperse nature of the modifying additive and the ratio of the nanodispersed and microdispersed parts of the solid phase were determined. Indicators for calculating the specific volumetric electrical resistance were determined by the probe method. The influence of the dispersed additive on the characteristics of the fluoroanhydrite composite was evaluated by standard laboratory methods. Features of structure formation were evaluated using the methods of physicochemical analysis. Results and discussion. It was confirmed that a fluoranhydrite-based mineral binder with sodium sulfate has moderate physical mechanical properties and might be used as a substitute for gypsum binder. The usage of an electrically conductive additive as a modifier enhances such mechanical properties as flexural compressive strength and compressive strength which increase by 51% and 65% correspondingly. Also, hydro physical properties have been improved, for instance the coefficient of softening for the FD-4 sample has increased by 39%, and the water absorption by mass for the same sample has decreased by 36%. Specific volume electrical resistance has decreased by 49-52% and equals13,6 kOm • cm, 8% of electrically conductive additive being added. The physical and technical properties of the presented composite are due to significant changes of the physical and chemical properties including the features of structure formation. Conclusions. The obtained compositions require extra optimization in order to be used as a heating component. At the same time, the achieved electrical conductivity is sufficient to level the electrostatic effect of self-leveling floors. Regularities in the formation of the structure of the fluoroanhydrite composite have been established, which manifest themselves in the formation of a larger number of contacts for the intergrowth of crystalline hydrate new formations ensured by the presence of a nanodispersed part in the modifying additive.

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Influence of the calcination temperature of phosphogypsum on the performance of supersulfated cements

Cited by 54 publications

References 22 publications

Environmental filling materials based on phosphogypsum powder with municipal solid waste incineration ash

Environmental filling materials based on phosphogypsum powder with municipal solid waste incineration ash

Effect of Calcium Hydroxide on the Microstructure and Performance of Super Sulfated Cement

Carbon-containing modifier for fluoranhydrite binder

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