Filler de grafito reciclado de EDM en pastas de yeso = EDM recycled graphite filler in gypsum pastes

Graphite can be obtained naturally or synthetically, but the latter has been used on roads because of its hardness, as well as in thin ceramic plates. The possibilities of the addition of the isostatic graphite powder from the milling of molds made by EDM in gypsum-based compounds are demonstrated. For this purpose mixtures of industrial gypsum with additions in different percentages of EDM graphite were prepared to evaluate the physical and mechanical properties, previously characterizing both materials. The gypsum was replaced by graphite in five different fractions, 5, 10, 15, 20 and 25% by weight, in the preparation of the mixtures. In the designation Y-0.7G-0 and Y-0.6G-0 of the series of prismatic specimens of 40x40x160mm, the letter Y refers to gypsum and G stands for graphite (G-0 test specimens without graphite) gypsum (a / y) 0.7 and 0.6. After the analysis of the results obtained, a new series was made with the addition of plasticizer and also with greater amount of graphite, 25 to 50% by weight and other ratios a / y based on their workability, to verify the incidence in the resistance to flexion and compression.