Abstract
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.
Highlights
The use of gypsum as an indoor coating material for buildings is very extensive
This paper presents the third step of research 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) [33]: In the first of the research, different percentages and sizes of polycarbonate waste were used
The following materials were used for the development of the new gypsum plasters: For this study, the following materials were used for the development of the new gypsum
Summary
The use of gypsum as an indoor coating material for buildings is very extensive. Its use in pastes, plastering mortars, or prefabricated elements (plasterboards, blocks) makes gypsum one of the most used materials on construction sites [1]. This means that huge amounts of gypsum waste are generated daily worldwide. According to Ahmed et al [2], around 15 million tons of gypsum plasterboard waste end up in landfills each year worldwide. It must be mixed with water to be used, producing an exothermic reaction, described by Le Chatellier, in which the gypsum plaster rehydrates, becoming a hard material [3,4,5]
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have