Effect of borax and sodium tripolyphosphate on fluidity of gypsum paste plasticized by polycarboxylate superplasticizer

Tan, Hongbo; Deng, Xi; Gu, Benqing; Ma, Baoguo; Luo, Shan; Zhi, Zhenzhen; Guo, Yulin; Zou, Fubing

doi:10.1016/j.conbuildmat.2018.05.005

Cited by 38 publications

(10 citation statements)

References 41 publications

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“…The main binder studied in conjunction with superplasticizer is cement, whereas reports about the coupled effect of superplasticizer with gypsum are rather scarce. However, Tan et al [20] indicated that polycarboxylic superplasticizer, as the most efficient dispersant in cement-based materials, also shows a good ability to disperse the gypsum particles. Peng et al [21] compared the effects of two types of superplasticizer on gypsum plaster: β-naphtalene sulfonic acid type and polycarboxylate type.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Isto ocorre devido ao fato de que, como relatado anteriormente, os aditivos superplastificantes contribuem para a diminuição dos poros na matriz (ZHANG; KONG, 2014) e, consequentemente, para o aumento da densidade do compósito (BOLTRYK et al, 2018). Enquanto que os menores valores foram obtidos pelos compósitos produzidos com o prétratamento REF e com o aditivo IAR (AARMR-DAYA et al, 2008;USMAN et al, 2018).…”

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

“…Assim como explicada anteriormente, a diminuição da resistência observada para os compósitos produzidos com a serragem pré-tratada pode ter sido influenciada pela maior disponibilidade de água que contribuiu para o aumento da porosidade e para a diminuição do desempenho mecânico (KUMAR, BHATTACHARJEE, 2003;CAPRAI et al, 2018;USMAN et al, 2018). Considera-se, ainda, que além das partículas amolecidas propiciarem o enfraquecimento da ligação com a matriz (ONUAGULUCHI, BANTHIA, 2016), os diferentes processos de hidratação dos dois aglomerantes presentes nos compósitos podem influenciar no desempenho (AIGBOMIAN, FAN, 2013).…”

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

“…Contudo, na presença de cimento, o material vegetal produz efeitos deletérios sobre o aglomerante como a inibição da pega (MEHTA, MONTEIRO, 2014). Diante disto, o gesso surge como alternativa contribuindo com o meio ambiente devido à redução das emissões de CO 2 quando comparado à produção do cimento Portland (MAGALANES-RIVERA et al, 2012;TAN et al, 2018) e, por isso, a adição de resíduos de madeira numa matriz de gesso pode contribuir para o desenvolvimento de compostos ecoeficientes (DAÍ; FAN, 2015; MORALES-CONDE; RODRIGUEZ-LINAN; PEDRENO-ROJAS, 2016; PEDRENO-ROJAS et al, 2017).…”

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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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“…Polycarboxylate superplasticizer is considered the most effective dispersant of cement-based materials and also demonstrates excellent ability to disperse gypsum particles (Tan et al, 2018;Neuville et al, 2012;Guan et al, 2010). Adding an aqueous solution of polycarboxylate esters increases the strength (Sakthieswaran & Sophia, 2018;Pan & Wang, 2011), reduces water demand (Martin, 2015) and increases the consistency of mixtures (Müller & Hampel, 2018).…”

Section: Introductionmentioning

confidence: 99%

Fluoroanhydrite Compositions Plasticized by Polycarboxylate Esters

Kalabina

Yakovlev

Dufek

et al. 2020

Engineering Structures and Technologies

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The influence of a plasticizer based on polycarboxylate esters on the properties of a high-strength fluoroanhydrite composition and a lightweight composition with expanded perlite sand is investigated. It was shown that the addition of 2% polycarboxylate esters on water base to compositions has increased compressive strength and a flexural strength up to 46% and 20% respectively compare to composite without any additives. Due to the structure's compaction of the compositions, water absorption decreased and the water resistance of the material increased. Microstructural analysis of the compositions confirmed the improvement of physical and mechanical characteristics by changing the morphology of crystallohydrate formations, increasing the contact area between new formations and modifying the structure by carbon nanotubes. The developed mixtures are supposed to be apply for self-leveling fluid mixtures for floors with reduced thermal conductivity.

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Effect of borax and sodium tripolyphosphate on fluidity of gypsum paste plasticized by polycarboxylate superplasticizer

Cited by 38 publications

References 41 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

Fluoroanhydrite Compositions Plasticized by Polycarboxylate Esters

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Effect of borax and sodium tripolyphosphate on fluidity of gypsum paste plasticized by polycarboxylate superplasticizer

Cited by 38 publications

References 41 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

Fluoro​an​hydrite Compositions Plasticized by Polycarboxylate Esters

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Fluoroanhydrite Compositions Plasticized by Polycarboxylate Esters