Abstract
The addition of inorganic expanded aggregates, such as perlite or vermiculite is well known in gypsum plasters. However, the reuse of organic wastes in coatings like plasters and renders has been poorly studied. This paper shows the effect of tire rubber wastes on the mechanical properties and fire performance of gypsum plasters. The rubber waste was added to the mixture in mass percentages of 14.50% (C1) and 46.60% (C2). Flexural and compressive strength of plasters made with rubber wastes was visibly reduced as well as their surface hardness (Shore C). In addition, fire tests produced major damages through the entire 2 cm thickness of samples containing rubber wastes, as it was corroborated by X ray diffraction (XRD) and Thermogravimetric (TG) analysis. The heat transfer due to fire exposure modified considerably the chemical composition of plasters, since, on the non-exposed face to fire, the amount of gypsum (CaSO4·2H2O) equivalent to mass loss obtained by TG due to water released by these plasters made with rubber wastes, was 5.4-7.2 lower than that of conventional plasters. The results suggest that certain wastes may reduce the efficiency of gypsum plasters in protecting underneath construction and structural elements against fire.
Highlights
RESUMEN: Influencia de los residuos de caucho de neumáticos en el comportamiento al fuego de revestimientos de yeso de elementos constructivos y estructurales
Since gypsum is sensitive to temperature, the aim of the study was to find out gypsum-related minerals that were stable at certain temperatures or fire conditions
This paper evaluates the physical performance and fire behavior of gypsum plasters made with tire rubber wastes (C1 and C2) and conventional plasters
Summary
RESUMEN: Influencia de los residuos de caucho de neumáticos en el comportamiento al fuego de revestimientos de yeso de elementos constructivos y estructurales. P. et al [29] studied the use as addition of recycled crumb rubber in plaster slabs They used a single particle size in quantities of 20%, 30%, 40% and 50% by volume of the final product. A. et al [30] added small proportions of recycled crumb rubber to gypsum (between 1% and 5%) and used three different grain sizes (0-1 mm, 1-2 mm, 2-4 mm) They found that the flexural and compressive strength were decreased by 16% and 19.3%, respectively. [31] analysed the influence of the dose and granulometry of recycled crumb rubber on thermal, acoustic and mechanical properties of gypsum-rubber plasters In this case, the plaster became less homogenous and workable by increasing the rubber dose and the size of the grains. The material may improve the thermal insulation capacity of gypsum boards, obtaining the best results for the finest grain size [32, 33]
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