Evaluation of properties of gypsum plaster-superplasticizer blends of improved performance

Pundir, Aakanksha; Garg, Man Mohan; Singh, Randhir

doi:10.1016/j.jobe.2015.09.012

Cited by 51 publications

(22 citation statements)

References 15 publications

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“…Moreover, the water molecules, which could be occlusive in the aggregates, are accessible, and its better use for wetting the grains is ensured. Pundir et al [23] indicated that the high strength of gypsum samples after the application of superplasticizer is connected with the formation of a dense and well-compacted texture of crystals, and the role of superplasticizer molecules as a kind of cross-linking agent, which increases the intercrystalline bonding between the crystals of gypsum. However, it was also reported [30] that polycarboxylic superplasticizer decelerates the early hydration of gypsum.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…It appeared that the first case belonged to physical adsorption, whereas the polycarboxylic molecules were adsorbed on gypsum in the form of chemisorption; the small adsorption amount and the good dispersion stability were confirmed. The results of other authors [22][23][24] showed that the addition of superplasticizer to gypsum-based material gives a dense and well-compacted structure of gypsum crystals, leading to higher strengths in the hardened materials and better water resistance for the gypsum matrix.…”

Section: Introductionmentioning

confidence: 96%

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Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

et al. 2020

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In this study, gypsum plasters enriched with the modified photocatalyst TiO2/N and additive components were prepared and analyzed in detail. The aim of this work was to recognize the combined impact of a photocatalyst, polycarboxylic superplasticizer (SP), and glass fiber (F) on the properties of the composed building materials. The mutual compatibility was verified in relation to self-cleaning and air-purifying activity as well as to the technical parameters defined in standards for gypsum materials. The measurements revealed that photocatalytic gypsum material can have high mechanical strength and limited shrinkage as a result of superplasticizer contribution in form of a water-reducing and well-dispersive agent. Normal consistency was achieved by the addition of 0.01 wt % of SP to photocatalytic gypsum mortar or by the addition of 0.2 wt % of SP with a 12% reduction of water. This study also explains why glass fiber fulfills the role of inner reinforcement only if a superplasticizer is simultaneously added to the gypsum matrix. It is possible, by the combined effect of TiO2/N, a polycarboxylic superplasticizer, and glass fiber, to achieve NOx degradation at a high level. Moreover, the significantly improved self-cleaning properties of the complex gypsum plasters surfaces from dye pollutants in comparison to a gypsum plaster with solely a TiO2/N photocatalyst indicate the synergistic effect of the three considered additives.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

et al. 2020

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“…Destaca-se que a maior resistência à tração na flexão foi observada para o compósito produzido com aditivo SUP e sem pré-tratamento SINGH, 2015;OUATTARA et al, 2018).…”

Section: Análise Das Propriedades No Estado Fresco E Endurecido Dos Cunclassified

Aditivos químicos em compósitos de gesso-madeira pré-tratados ou não com suspensão de hidróxido de cálcio

Rocha¹,

Mendes²,

Réus³

et al. 2020

RBES

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Os compósitos de gesso-madeira são uma alternativa para minimizar os impactos ambientais provocados pela geração da serragem. Diferentes tipos de aditivos químicos podem ser utilizados a fim de aprimorar as propriedades dos compósitos. O objetivo deste estudo foi verificar a influência de dois aditivos químicos nas propriedades de compósitos produzidos com gesso e serragem de pinus pré-tratados ou não com suspensão de cal. Os compósitos foram produzidos com relação água/gesso de 0,70, relação gesso/madeira de 1:0,75, pré-tratados com suspensão de cal numa proporção cal/água de 1:6, e contendo aditivo superplastificante e incorporador de ar. Foi determinada a densidade de massa fresca e produzidos corpos de prova para, aos 28 dias, determinar a densidade de massa endurecida, a resistência à tração na flexão e à compressão. Os resultados indicaram que os compósitos produzidos são 33% mais leves quando comparados ao drywall e apresentaram resultados de resistência à tração na flexão entre 0,1 e 2,0 MPa e à compressão entre 0,5 e 5,0 MPa. Conclui-se que para os compósitos produzidos sem pré-tratamento houve acréscimo da resistência à tração na flexão e à compressão superior a 66% e a 100% com relação aos valores mínimos exigidos por normas internacionais.

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“…The reinforcement of gypsum compositions is often carried out by the introduction of fibrous fillers [10] or polymeric additives such as PVA [11][12][13], latex [14,15], plastic waste [16].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Strength and chemical resistance of composites based on epoxy resins, filled with gypsum in the original and waterhardened forms

Starokadomsky¹,

Rassokhin²,

Ishchenko³

et al. 2020

EEJET

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This paper reports the results of studying epoxy compositions with gypsum taken in the form of dispersed powders in the original and water-hardened form. The exact pattern has been shown in the way the introduction of a gypsum additive in the amount of 50 % by weight affects the strength, chemical stability, and morphology of the composites. Under conventional heat treatment (60-110 °C) of the hardened composites, the maximum stress at compression σ m and the elasticity module at compression Е с , as well as wear resistance, decrease after the introduction of gypsums (of both types). At the same time, after a hard (destructive) heating at 250-260 °C, the elasticity module Ес of the hardened composites increases. The maximum stress at compression σ m is also increased. The same applies to the wear resistance, which grows especially noticeably after 250 °C. The micro-hardness after filling is prone to increase but the fragility of epoxy-gypsum composites does not make it possible to measure it when a punch (a steel hemisphere) penetrates it deeper than 20 μm. However, after the heat treatment at 250-260 °C, the unfilled polymer, on the contrary, is embrittled while the filled ones are plasticized, thus showing a high micro-hardness at significant (30-50 μm) immersion. The composites with gypsum, in contrast to the unfilled ones, do not disintegrate in acetone and retain integrity at any aging duration (up to 75 days and beyond). In this case, the original gypsum produces a composite with less swelling in acetone than the hardened gypsum. Based on the data from atomic-strength microscopy (ASM) microscopy, the morphologies of the non-filled composite, the composites with the hardened gypsum and original gypsum are different. The original gypsum forms a composite with a more pronounced (possibly crystalline) filler structure; the morphology for the hardened composite reflects the distribution of inert particles; for the unfilled composite (H-composite), only pores are visible against the background of a relatively smooth relief

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Evaluation of properties of gypsum plaster-superplasticizer blends of improved performance

Cited by 51 publications

References 15 publications

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Aditivos químicos em compósitos de gesso-madeira pré-tratados ou não com suspensão de hidróxido de cálcio

Strength and chemical resistance of composites based on epoxy resins, filled with gypsum in the original and waterhardened forms

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Evaluation of properties of gypsum plaster-superplasticizer blends of improved performance

Cited by 51 publications

References 15 publications

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Combined Effect of Photocatalyst, Superplasticizer, and Glass Fiber on the Photocatalytic Activity and Technical Parameters of Gypsum

Aditivos químicos em compósitos de gesso-madeira pré-tratados ou não com suspensão de hidróxido de cálcio

Strength and chemical resistance of composites based on epoxy resins, filled with gypsum in the original and water­hardened forms

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Product

Resources

About

Strength and chemical resistance of composites based on epoxy resins, filled with gypsum in the original and waterhardened forms