Comparing the effects of a retarder and accelerator on properties of gypsum building plaster

Moghadam, Hajar Ahmadi; Mirzaei, Ali

doi:10.1016/j.jobe.2019.101075

Cited by 24 publications

(8 citation statements)

References 31 publications

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“…It appeared that 1 wt % of the photocatalyst in plaster mass resulted in a 30 min shorter setting time. Referring to the theory [26,27], the setting of plaster is the hydration process, which occurs through the crystallization mechanism. The transformation of gypsum binders into a solid body happens gradually.…”

Section: Setting Timementioning

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: Setting Timementioning

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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“…Gypsum plaster is a soluble material, and when exposed to water it tends to incorporate it, weakening the bonds between the crystals by capillary pressure. The more intense the interactions between the crystal surfaces and the lower the porosity of the solid body, the more resistant to the effect of water the material will be (MOGHADAM; MIRZAEI, 2020;SINGH;GARG, 1996). The plaster hydration process during the socalled induction period also influences the water tolerance of the hardened material (KANNO, 2010).…”

Section: Mass Loss By Submersion In Water and Consistencymentioning

confidence: 99%

Use of graphene as an additive to improve the mechanical properties of gypsum plaster

Ferreira¹,

Lima²,

Nascimento³

et al. 2023

Braz. J. Develop.

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This work aimed to investigate the effects of graphene nanoparticles on the mechanical and morphological properties of gypsum plaster paste. In order to do so, samples of pure gypsum plaster paste with multilayer graphene were produced. These samples were prepared with a water/plaster factor (w/p) of approximately 0.5 with different graphene dosages. The mechanical analysis results showed that the graphene dosage of 0.02% increased the compressive and tensile strength values in the order of 120%. The increase in these properties is most likely due to the heat dissipation promoted by graphene, the greater production of crystalline nuclei and the reactivity of graphene with Ca2+ ions. Regarding the plaster setting times, a reduction in the values was observed for most samples, indicating an increase in the production of crystalline nuclei. FTIR analyzes indicate that there were no changes in terms of chemical properties.

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“…Interactions between CaSO 4 •0.5[H 2 O] and chemical additives depend on the nucleation process, which usually occurs through the blending of primary species by collision. However, chemical additives usually reduce the collision probability, resulting in more time for crystal nucleation and for the transformation into crystalline CaSO 4 •2[H 2 O] [5,[11][12][13][14][15][16][17][18][19][20][21]. Additionally, Pan and Li [22] proposed the use of an admixture containing fluorinated silicone to improve the humidity resistance.…”

Section: Introductionmentioning

confidence: 99%

Influences of Recycled Polyethylene Terephthalate Microplastic on the Hygrothermal and Mechanical Performance of Plasterboard with Polymethylhydrosiloxane Content

Romano-Matos,

Tundidor-Camba,

Vera

et al. 2024

Materials

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New composites produced with recycled waste are needed to manufacture more sustainable construction materials. This paper aimed to analyze the hygrothermal and mechanical performance of plasterboard with a polymethylhydrosiloxane (PMHS) content, incorporating recycled PET microplastic waste and varying factors such as PMHS dose, homogenization time, and drying temperature after setting. A cube-centered experimental design matrix was performed. The crystal morphology, porosity, fluidity, water absorption, flexural strength, and thermal conductivity of plasterboards were measured. The results showed that incorporating recycled PET microplastics does not produce a significant difference in the absorption and flexural strength of plasterboards. However, the addition of recycled PET reduced the thermal conductivity of plasterboards by around 10%.

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Comparing the effects of a retarder and accelerator on properties of gypsum building plaster

Cited by 24 publications

References 31 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

Use of graphene as an additive to improve the mechanical properties of gypsum plaster

Influences of Recycled Polyethylene Terephthalate Microplastic on the Hygrothermal and Mechanical Performance of Plasterboard with Polymethylhydrosiloxane Content

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