Evaluation of the thermal performance of eco-friendly bricks fabricated with incorporation of mullite residues
DOI:
https://doi.org/10.14482/inde.39.1.624.181Keywords:
Ceramic fibre, Clay, Direct flame exposure, Eco-friendly bricks, Recycling, RefractoryAbstract
The aim of this research was the production of clay-brick, from red clay, waste from a disused electric furnace, reinforced with ceramic fibers, to obtain a ceramic material with refractory characteristics. The clay/waste particle proportion was 50:50 by weight, and the incorporation of fiber was 10% and 20% by volume, to obtain a ceramic by sintering at 1000°C, for 2 hours. The designed materials were characterized by X-ray diffraction, the flexural and compressive strength, density, porosity, and absorption were determined. The thermal performance was also verified by direct exposure to 1000°C flame. The results showed that as ceramic fiber was incorporated, the compressive strength decreased by 17.3% for AF10 and 17.0% for AF20. The flexural strength values were at 3.4 MPa. The coefficient of thermal conductivity was 0.5322 W/m.K, and, during direct flame exposure, the samples achieved a thermal gradient of ~ 700 °C for samples 2 cm thick. The mineralogical phases obtained for the bricks were mullite, corundum, and cordierite, which are considered refractory.
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