This work has for objective to reformulate a typical roofing tile body from Campos dos Goytacazes with additions of shale powder from Itu, sedimentary rock extensively used for the production of structural ceramic in that region. Compositions with a plastic clay from Campos dos Goytacazes and 30, 40, and 50 wt. % of shale powder were prepared and characterized. The properties and characteristics of the compositions with shale were compared with a roofing tiles body from the north-fluminense region. To determine the physical and mechanical properties specimen were prepared by extrusion and fired at temperatures varying from 800 to 1050 ºC. The technological properties evaluated were: bulk density, linear shrinkage, water absorption and flexural rupture strength. The results indicated that the use of shale clay powder could improve the performance of the industrial roofing tile produced in Campos dos Goytacazes.
clay; shale clay; kaolinite; roofing tile
