Lightweight recycled gypsum with residues of expanded polystyrene and cellulose fiber to improve thermal properties of gypsum

K.A De Oliveira,C.A.B Oliveira,J.C Molina

doi:10.3989/mc.2021.07520

Abstract

In this study, different proportions of gypsum composite reinforced with recycled cellulose fibers and expanded polystyrene were produced to study the properties of thermal conductivity, density, and flexural strength to be used as sealing plates to improve the thermal comfort of buildings. Different gypsum matrix composites were produced with varied proportions of cellulose fiber and expanded polystyrene, to analyze the influence of residues on the properties of the material. The thermal conductivity obtained for composites with greater amounts of expanded polystyrene was 0.18 W/mK, a 48% reduction in relation to plasterboard, improving thermal performance. The flexural strength was also analyzed, which met the minimum strength requirement for use as gypsum composites, however, it is not enough to be used in places that require mechanical resistance, thus it is indicated for sealing plates applications, improving the thermal performance of places where only plasterboard is used.

Highlights

In this study, different proportions of gypsum composite reinforced with recycled cellulose fibers and expanded polystyrene were produced to study the properties of thermal conductivity, density, and flexural strength to be used as sealing plates to improve the thermal comfort of buildings
La conductividad térmica obtenida para los composites con mayores cantidades de poliestireno expandido fue de 0,18 W/mK, una reducción del 48% con relación a las placas de yeso, mejorando el rendimiento térmico
The construction industry is one of the most important areas for the economic and social development of the world, and the concern for thermal comfort is a major item in today's constructions

Summary

Introduction

Different proportions of gypsum composite reinforced with recycled cellulose fibers and expanded polystyrene were produced to study the properties of thermal conductivity, density, and flexural strength to be used as sealing plates to improve the thermal comfort of buildings. Se produjeron diferentes composites de matriz de yeso con variadas proporciones de fibra de celulosa y poliestireno expandido, para analizar la influencia de los residuos en las propiedades del material. For Lamberts et al [1], the buildings are responsible for 42% of electricity consumption, where much of it is by air conditioning systems For this reason, it is important to know the thermal properties of building materials, because the choice of a suitable sealing material can reduce the solar thermal charge transmitted to the interior of the dwellings. The construction industry is one of the largest consumers of natural resources, most non-renewable, and one of the largest waste generators in Brazil, accounting for 40 to 60% of urban solid waste, usually referred to as debris, such as bricks, concrete, rocks, soils, gypsum, mortar, and other materials [2, 3]

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Conclusion