Influence of the heating process on the use of gypsum wastes in plasters: Mechanical, thermal and environmental analysis

Pedreño-Rojas, Manuel Alejandro; Flores‐Colen, Inês; Brito, Jorge de; Rodríguez-Liñán, C.

doi:10.1016/j.jclepro.2019.01.053

Cited by 52 publications

(24 citation statements)

References 27 publications

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“…The recycled gypsum came from the panels’ cutting process, using the pieces smaller than 1 mm ( Figure 1 b); Polycarbonate waste (PC): rejected CDs and DVDs obtained from all the recycling points located in the University of Seville (Spain). After that, the pieces were crushed, obtaining pieces smaller than 4 mm, as seen in Figure 1 c. Citric acid: used as a set retarder in some composites to maintain the water/gypsum (w/g) ratio in all the plasters [ 17 , 35 ]. …”

Section: Methodsmentioning

confidence: 99%

“…Citric acid: used as a set retarder in some composites to maintain the water/gypsum (w/g) ratio in all the plasters [ 17 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

“…The w/g ratio of the plasters was obtained using the flow-table test, following the procedure defined in UNE-EN 13279-2 [ 38 ]. As noted in previous studies, the use of gypsum waste worsened the workability of the new plasters, requiring more water to make the mixes [ 35 ]. Therefore, and in order to maintain the w/g ratio in all the plasters, citric acid was used as a set retarder of the composites.…”

Section: Methodsmentioning

confidence: 99%

“…It was concluded that it is possible to use unheated gypsum waste from plasterboards as a complete substitute of a traditional one, improving the environmental (77%), thermal (18.8%), and mechanical properties (17%) of the new plasters. However, the workability of the composites worsened [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Use of Polycarbonate Waste as Aggregate in Recycled Gypsum Plasters

et al. 2020

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The use of gypsum as an indoor coating material for buildings is very extensive. This means that huge amounts of gypsum waste are generated daily worldwide. Therefore, many researchers in the last years have been working on the generation of new gypsum-related materials and products that incorporate recycled gypsum waste as a replacement for the commercial one. On the other hand, trying to reduce the large amounts of plastic generated globally each year, several studies have used different types of plastic waste as aggregates for the development of new construction and building materials. However, up to now, no previous studies have been found in which any type of plastic waste has been used as an aggregate in a recycled gypsum matrix. This paper presents a study in which two different types of waste were mixed for the development of new gypsum plasters: unheated gypsum waste from industrial plasterboard production (GPW) and polycarbonate (PC) waste from rejected compact discs (CDs) and digital versatile discs (DVDs). In this sense, the mechanical and thermal performance of plasters was evaluated. Finally, in order to evaluate the changes in the microstructure of the composites, a scanning electron microscopy (SEM) analysis was conducted. The results showed a good performance of the new composites when both types of waste were combined in the mixes. New lightweight eco-efficient plasters, completely recycled, with enhanced flexural strength (by 14.8%), compressive strength (by 26.8%), and thermal conductivity (42.8% less), compared to the reference material, were achieved.

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Section: Methodsmentioning

confidence: 99%

“…Citric acid: used as a set retarder in some composites to maintain the water/gypsum (w/g) ratio in all the plasters [ 17 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of Polycarbonate Waste as Aggregate in Recycled Gypsum Plasters

et al. 2020

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“…Other studies conducted in gypsum composites incorporated different waste streams (gypsum, insulation materials, plastics, wood, ceramic etc.). Pedreño-Rojas et al [16] analyzed recycled gypsum and showed different physical proprieties in accordance with the commercial gypsum. Furthermore, San Antonio Gonzalez [17] analyzed different compounds containing polystyrene waste, resulting in lightweight gypsums with good thermal behavior and resistance to water, while the surface hardness and compression strength worsened.…”

Section: Literature Reviewmentioning

confidence: 99%

Mechanical Characterization of Gypsum Composites Containing Inert and Insulation Materials from Construction and Demolition Waste and Further Application as A Gypsum Block

et al. 2020

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This article analyzes the feasibility of using construction and demolition waste (expanded polystyrene, ceramic, and concrete waste) in a gypsum matrix to manufacture plaster for interior coatings or for prefabricated elements for interior partitions. To do this, several gypsum specimens were prepared (4 × 4 × 16 cm) incorporating different percentages of waste based on the weight of the gypsum (25%, 50%, and 75% of ceramic, concrete, and a mixture of both). Reference samples were also produced (without additions) to compare the results obtained. The compounds with the best performance were selected and lightened by preparing other samples in which 1/3 and 2/3 of the volume of ceramic, concrete, and mixed waste were replaced with expanded polystyrene (EPS). All samples were tested in the laboratory and the following physical and mechanical characteristics were determined: density, surface hardness, flexural strength, compressive strength, capillary water absorption, and thermal conductivity. Several applications were proposed for the selected compounds. A gypsum block with a sandwich configuration was obtained (40 × 20 × 10 cm) using the optimum compound. The block was further tested regarding its density and compression strength. A comparative analysis showed that it is possible to produce materials with a gypsum matrix by adding ceramic, concrete, and EPS waste, improving the behavior of the traditional gypsum and enabling them to be applied in various construction applications. These applications have a lower environmental impact than ordinary ones because they use less primary raw material, due to the reuse of waste.

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