Effect of some waste additives on the physical and mechanical properties of gypsum plaster composites

Khalil, A. A.; Tawfik, A.; Hegazy, A.A.; El-Shahat, M.F.

doi:10.1016/j.conbuildmat.2014.06.081

Cited by 66 publications

(35 citation statements)

References 15 publications

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“…In this case, the incorporation of polyacrylic ester formed a film on the gypsum particles, which restricted and delayed its hydration. Concerning PEE, we observed increments of compression strength of the modified gypsum, possibly because of the filling of the matrix voids, which can change the morphology of the crystals from the calcium sulfate dihydrate phases, thus refining the pore structure 3,11 .…”

Section: -mentioning

confidence: 95%

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Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

et al. 2019

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Studies on gypsum modified by polymers have been conducted to assess the potential of improvement in the mechanical performance, water resistance and increasing the setting time, facilitating its handling. Gypsum-based compounds made with different additions of redispersible polymers were studied, such as: ethylene-vinyl acetate (EVA), vinyl acetate terpolymer, vinyl laurate and vinyl chloride (VA/VL/VC), and vinyl acetate and vinyl versatate (VA/VeoVA). The influence on setting time, microstructural formation and on the bending performance was assessed, as well as and compression of the hardened gypsum. The composites were prepared using a polymer concentration of 5% and 10%, and water/gypsum ratio of 0.6. The addition of the polymer decreased the structural robustness and change in the microstructure. We concluded that the reduction in the amount of water through additives may allow a more complete and robust training of gypsum crystals and compounds with better mechanical performance.

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Section: -mentioning

confidence: 95%

“…The consistency index and the setting time of modified gypsum by polyvinyl alcohol (PVA) is also changed 11 . The PVA addition increases the initial and end of the setting time of the gypsum.…”

Section: -mentioning

confidence: 99%

Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

et al. 2019

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“…Esta se puede originar principalmente por la reducción del crecimiento de los poros abiertos y capilares en el endurecimiento de las pastas de yeso con el grafito, como ocurre con otros rellenos en otros conglomerados (Taylor, 1997). Se puede afirmar que el relleno de grafito reduce la absorción de agua de compuestos a base de yeso más que otras cargas, como gel de sílice o humo de sílice (Khalil et al, 2013) y escorias (Khalil et al, 2014).…”

Section: B Propiedades Físicas Del Estado Endurecido De Las Pastasunclassified

“…Estos resultados son similares a los presentados en estudios con otros aglutinantes, tales como cementos con cargas tales como micro o nanosílice (Taylor, 1997). Sin embargo, en el yeso el uso de relleno de grafito EDM en un tamaño de nanoescala, presenta un mejor resultado que con otros rellenos, como el humo de sílice u otros aditivos residuales (cáscara de arroz, escoria de hornos, carbonato de cal, polímero de PVA), presentado en el trabajo de Khalil et al (Khalil et al, 2013;Khalil et al, 2014). La diferencia con la eficacia de otros materiales de relleno utilizados en compuestos de yeso puede ser causada también por la reducción del tamaño de los cristales de sulfato de calcio que se observan en la interfaz grafito/yeso.…”

Section: Propiedades Mecánicas De Las Pastas De Yeso Endurecidasunclassified

Filler de grafito reciclado de EDM en pastas de yeso = EDM recycled graphite filler in gypsum pastes

Flores

Barbero

Bustamante

2017

ADE

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Resumen-El grafito puede obtenerse de forma natural o sintética, pero este último se ha utilizado en carreteras debido a su dureza, así como en placas de cerámica fina. Se demuestran las posibilidades de la adición del polvo de grafito isostático procedente del fresado de moldes fabricados por Electroerosión de Penetración (EDM) en compuestos a base de yeso. Para ello se prepararon mezclas de yeso industrial con adiciones en porcentajes diferentes de grafito EDM para evaluar las propiedades físicas y mecánicas, caracterizando previamente ambos materiales. El yeso fue sustituido por grafito en cinco fracciones diferentes, 5, 10, 15, 20 y 25%, en peso, en la preparación de las mezclas. En la designación Y-0.7G-0 y Y-0.6G-0 de las series de probetas prismáticas de 40x40x160mm, la letra Y se refiere al yeso y G significa grafito (G-0 probetas patrón sin grafito), con relaciones agua/yeso (a/y) 0,7 y 0,6. Después del análisis de los resultados obtenidos, se realizó unas nuevas series con la adición de plastificante y también con mayor cantidad de grafito, 25 a 50% en peso y otras relaciones a/y basadas en su trabajabilidad, para verificar la incidencia en la resistencia a flexión y compresión.Palabras clave-Grafito; yeso; EDM; panel. Abstract-

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“…Zhao Feng-qing 8) has studied the mixing of water repellent agents that are prepared by granular blast furnace slag, high calcium fly ash and some additives with calcined desulfurized gypsum; this was aimed at preparing a waterproof gypsum block. Khalil A.A. 9) has investigated the preparation of gypsum-based composites by mixing it with 0.2%10% of unburned rice hulls, blast furnace slag, calcium carbonate and polyvinyl alcohol (PVA) to improve water resistance. Zhu Cong 10) has researched the effects of polyvinyl alcohol and polypropylene fibers on the workability, hydrodynamics, mechanical properties and water resistance of gypsum-based composites.…”

Section: Introductionmentioning

confidence: 99%

Improvement in Water Resistance of Desulfurized Gypsum by Novel Modification of Silicone Oil Paraffin Composite Emulsion-based Waterproofing Agent

Cao¹,

Li²,

Jiang³

et al. 2019

J. Korean Ceram. Soc

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In this study, dimethyl silicone oil and liquid paraffin were combined and subsequently emulsified; the resulting mixture was innovatively incorporated into desulfurized gypsum to resolve its drawback of a poor water resistance. The waterproof mechanism of the composite emulsion and liquid paraffin emulsion with mass fractions of 1%, 2%, 3%, and 4% were investigated. The effect of the desulfurized gypsum on the waterproof performance and basic mechanical properties were also investigated. The configuration of the composite waterproofing agent was characterized by FTIR and 1 HNMR. The results showed that, compared with the traditional liquid paraffin emulsion-based waterproofing agent, the softening coefficient of the silicone oil paraffin composite emulsion-based water-repellent agent was increased by 60% and attained a value of 0.89. Combined with the waterproof mechanism and microscope morphology analysis of gypsum hydration products, the improvement in the water resistance of water resistance was primarily attributed to the formation of a silicone hydrophobic membrane between the crystals of the gypsum block; this ensured that water could not penetrate the crystal.

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Effect of some waste additives on the physical and mechanical properties of gypsum plaster composites

Cited by 66 publications

References 15 publications

Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

Mechanical and Microstructural Properties of Redispersible Polymer-Gypsum Composites

Filler de grafito reciclado de EDM en pastas de yeso = EDM recycled graphite filler in gypsum pastes

Improvement in Water Resistance of Desulfurized Gypsum by Novel Modification of Silicone Oil Paraffin Composite Emulsion-based Waterproofing Agent

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