Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
INTENSIFICATION OF THE THERMO-PHYSICAL PROPERTIES OF HYDRATED LIME AND GYPSUM COMPOSITES WITH GRAPHITE MICRO-SCALE PARTICLES
Submission Author:
Ítalo Guilherme , MG , Brazil
Co-Authors:
Ítalo Guilherme, Pedro Henrique Silva Santos, David Fernando Marcucci Pico, ENIO PEDONE BANDARRA FILHO
Presenter: Ítalo Guilherme
doi://10.26678/ABCM.COBEM2021.COB2021-0228
Abstract
Thermo-physical properties of composite materials based on hydrated lime and gypsum were acquired in order to evaluate the influence of the addition of graphite on the increase of these properties, in particular of the thermal conductivity. The focus on thermal conductivity is due to the influence of this property on the heat transfer process of solids. Therefore, it was evaluated which is the most appropriate mass fraction of graphite, ranging form 0 to 25 % compared to matrix mass, and what is the amount of water suitable for the production of the materials, in addition to the drying time necessary to guarantee a material that has a high thermal conductivity value. In that way, after the curing process, an increase of approximately 134 % in thermal conductivity was analyzed comparing the sample without the addition of graphite powder (0.22 W/mK) with the sample containing the largest mass of graphite (0.51 W/mK). The same was observed for gypsum composites, with a maximum increase of 106 % being observed in the case of material with a greater amount of graphite powder, with thermal conductivity of 0.76 W/mK, since pure gypsum, with the same amount of water in the production, resulted in thermal conductivity of 0.37 W/mK. A statistical analysis was also performed, and proved that the addition of graphite had a significant influence on the specific mass, thermal diffusivity and mainly on thermal conductivity of the composites. In addition, the amount of water used in the mixture had a negative effect on the values of diffusivity and thermal conductivity.
Keywords
thermal conductivity, thermophysical properties, Hydrated lime, Gypsum, graphite
