Comparison of physical and mechanical properties of civil construction plaster and recycled waste gypsum from São Paulo, Brazil

Cordon, Heloísa Cristina Fernandes; Cagnoni, Felipe Carvalho; Ferreira, Fábio Furlan

doi:10.1016/j.jobe.2019.01.010

Cited by 41 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The researchers used the QPA combined with XRD data and determined a basanite content equal to 99.80% in a sample of recycled gypsum plasterboard. Cordon et al [17] compared a recycled gypsum waste with a commercial plaster, expecting to find only the main sulfate compounds (basanite and anhydrite), but as the origin of commercial plaster was not known, they ended up finding impurities (mainly carbonates), such as dolomite and calcite, among others. According to Seufert et al [18], samples with low contents of anhydrite III and basanite require fixing of the basanite lattice parameters to stabilize the quantification results.…”

Section: Raw Materialsmentioning

confidence: 99%

Effects of plaster to water ratio on physical and mechanical properties of ceramic pieces produced by the slip casting process

2022

View full text Add to dashboard Cite

In the slip casting process, the relationship between the amount of plaster and water used in the production of molds influences the production of ceramic materials, because the higher the water content in the mixture, the lower the mechanical strength of the mold and higher the water absorption rate. In order to evaluate the influence of the variation in the plaster/water (P/W) ratio in the production of ceramic pieces, plaster molds with P/W ratios of 2.0, 1.67, 1.43, and 1.25 (100 parts of plaster/50, 60, 70, and 80 parts of water by weight) were manufactured and used in the production of ceramic pieces. It was found that the fluidity, density, flexural and compressive strength of the molds decreased with the increase of water content. For pieces sintered at 1050 °C, higher density and lower porosity were observed for ceramic materials obtained with molds with higher plaster/water ratios.

show abstract

Section: Raw Materialsmentioning

confidence: 99%

Effects of plaster to water ratio on physical and mechanical properties of ceramic pieces produced by the slip casting process

2022

View full text Add to dashboard Cite

show abstract

“…Since the transformation reactions of gypsum into plaster (hemihydrate) by calcination, and from the plaster into dihydrate (product of the same composition that originated it) through hydration are reversible (3), the recycling of plaster residue is easily performed, according to Cordon 22 , resulting in a product with binder properties 1,11 (3) However, the chemical composition of the hydrated gypsum residue may be different from the natural gypsum that originated it, containing different levels of hemihydrates, anhydrites, and impurities. Also, the morphology of the dihydrate crystals resulting from hydration may be different from those composing natural gypsum due to the conditions in which the crystals were formed 23,24 .…”

Section: Recycling Of Gypsum Wastementioning

confidence: 99%

Parametric Rietveld Refinement Applied to In-Situ Monitoring of X-Ray Powder Diffraction Data of Plaster Hydration

Cordon

Ferreira

2019

Mat. Res.

Self Cite

View full text Add to dashboard Cite

“…In the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO 2 removed [ 3 ]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [ 4 ]. A substantial amount of desulfurized gypsum is generated as a by-product of limestone gypsum flue gas desulfurization systems.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Coagulation Characteristics of Flue Gas Desulfurization Gypsum-Based Polymer Materials

Huang

Wang

et al. 2022

Polymers

View full text Add to dashboard Cite

To resolve problems caused by the accumulation of flue gas desulfurization gypsum (FGDG) in the environment, a polymer material was prepared using FGDG, granulated blast furnace slag (GBFS), fly ash (FA), and solid sodium silicate (SSS). The compressive strength of these polymer specimens cured for 3, 28, and 60 d was regularly measured, and their condensation behavior was analyzed. Both the formation behavior of mineral crystals and microstructure characteristics were analyzed further using X-ray diffraction and scanning electron microscopy. The compressive strength of pure FGDG polymer specimen (whose strength is generated by particle condensation crystallization) is insufficient and the condensation is slow. The addition of appropriate amounts of GBFS, FA, and SSS can continuously and considerably improve the compressive strength and shorten the setting time. The optimal proportions of FGDG, GBFS, and FA are 50%, 20%, and 30%, respectively, with the SSS addition amount of 20 g. The incorporation of GBFS, FA, and SSS can promote the polymerization of calcium, silicon, and aluminum in FGDG to form silicate and aluminosilicate minerals. Their formation is the main reason for the increased compressive strength and accelerated coagulation.

show abstract

Comparison of physical and mechanical properties of civil construction plaster and recycled waste gypsum from São Paulo, Brazil

Cited by 41 publications

References 36 publications

Effects of plaster to water ratio on physical and mechanical properties of ceramic pieces produced by the slip casting process

Effects of plaster to water ratio on physical and mechanical properties of ceramic pieces produced by the slip casting process

Parametric Rietveld Refinement Applied to In-Situ Monitoring of X-Ray Powder Diffraction Data of Plaster Hydration

Mechanical Properties and Coagulation Characteristics of Flue Gas Desulfurization Gypsum-Based Polymer Materials

Contact Info

Product

Resources

About