Polymer composites based on gypsum matrix

Mucha, Maria; Mróz, Patrycja; Kocemba, Aleksandra

doi:10.1063/1.4949694

Cited by 11 publications

(4 citation statements)

References 6 publications

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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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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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“…In the same study, the best mechanical resistance was attributed to the formation of a greater number of intertwined needle-shaped crystals. Additional investigations can be found with evaluations of additives and their effects on the final morphology of the formed plaster and its properties [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Plasterboard Properties by the Control of Polymethylhydrosiloxane Dosage, Stirring Time, and Drying Temperature Applied to the Calcium Sulfate Hemihydrate and Water Mixture

et al. 2023

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Plasterboard is an important building material in the construction industry because it allows for quick installation of walls, partitions, and ceilings. Although a common material, knowledge about its performance related to modern polymers and fabrication conditions is still lacking. The present work analyzes how some manufacturing factors applied during the plaster board fabrication impact on some plasterboard properties, including water absorption, flexural strength, and thermal conductivity. The manufacturing variables evaluated are the dose (D) of polymethylhydrosiloxane (PMHS), the agitation time of the mixture (H), and the drying temperature of the plaster boards after setting (T). The results suggest that factors D, H, and T induce changes in the porosity and the morphological structure of the calcium sulfate dihydrate crystals formed. Performance is evaluated at two levels of each factor following a statistical method of factorial experimental design centered on a cube. Morphological changes in the crystals of the resulting boards were evaluated with scanning electron microscopy (SEM) and the IMAGEJ image analysis program. Porosity changes were evaluated with X-ray microcomputed tomography (XMT) and 3D image analysis tools. The length-to-width ratio of the crystals decreases as it goes from low PMHS dosage to high dosage, favoring a better compaction of the plasterboard under the right stirring time and drying temperature. In contrast, the porosity generated by the incorporation of PMHS increases when going from low-level to high-level conditions and affects the maximum size of the pores being generated, with a maximum value achieved at 0.6% dosage, 40 s, and 140 °C conditions. The presence of an optimal PMHS dosage value that is approximately 0.6–1.0% is evidenced. In fact, when comparing trails without and with PMHS addition, a 10% decrease in thermal conductivity is achieved at high H (60 s) and high T (150 °C) level conditions. Water absorption decreases by more than 90% when PMHS is added, mainly due to the hydrophobic action of the PMHS. Minimum water absorption levels can be obtained at high drying temperatures. Finally, the resistance to flexion is not affected by the addition of PMHS because apparently there are two opposing forces acting: on one hand is the decrease in the length–width ratio giving more compactness, and on the other hand is the generation of pores. The maximum resistance to flexion was found around a dosage of 0.6% PMHS. In conclusion, the results suggest that the addition of PMHS, the correct agitation time of the mixture, and the drying temperature reduce the water absorption and the thermal conductivity of the gypsum boards, with no significant changes in the flexural resistance.

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“…Some of the most important materials in the building industry is CaSO 4 •2H 2 O, called gypsum (calcium sulfate hydrate), which is necessary for sound insulation at walls, in addition to many applications such as precast panels and parts, interior finishing works, and as a binder (Mucha et al, 2016;Yu and Brouwers, 2011). Moreover, all this could be due to the attraction of the design, the simplicity of manufacture and configuration, the favorable price in the market, so it is relatively stable, and the low density with the possibility of playing an important role in repelling and spreading fires and reducing its heat (Yıldızel and Çarbaş, 2018;Yu and Brouwers, 2011).…”

Section: Introductionmentioning

confidence: 99%

The Evaluation Effect of Copper Fibre Diameter on Enhancing Compressive Strength of Pure Gypsum

Shubber,

Abbas,

AL-Taweel

et al. 2023

J. Ecol. Eng.

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The sustainability and impact of copper fibres on pure gypsum is the primary purpose of this study to investigate a combination of two kinds of copper fibres obtained from environmental waste (damaged electrical wires). The copper fibres are dividings into a fixed length of 10 mm, but with two different diameters: the first is 0.83 mm and the second is 0.63 mm, where the ratio of width to height (L/D) is 12 and 15.9, respectively, with a volume ratio V f = 0.4%, the ratios 0.5 and 0.6 represent the water to gypsum ratio (W/G ) individually. Each W/G ratio has two types of mixtures which organize according to diameter. The first considers a reference mixture without copper fibres (CF), and the other is a copper fibres mixture. This work found that the compressive strength increased from adding the copper fibres to a mixture of pure gypsum. Furthermore, this increase is apparent in pure gypsum compressive strength when raising the aspect ratio because of reducing the copper fibres' diameters. In another way, increasing ratio of W/G in the case of existing copper fibres or none may reduce a compressive strength of mixtures. Therefore, when the ratio of W/G drops, the significance of copper fibres may become more apparent.

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Polymer composites based on gypsum matrix

Cited by 11 publications

References 6 publications

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

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

Improvement of Plasterboard Properties by the Control of Polymethylhydrosiloxane Dosage, Stirring Time, and Drying Temperature Applied to the Calcium Sulfate Hemihydrate and Water Mixture

The Evaluation Effect of Copper Fibre Diameter on Enhancing Compressive Strength of Pure Gypsum

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