Estudo das propriedades tecnológicas e microestruturais da formulação damassa argilosa com adição do metacalcário para bloco estrutural

Abstract

Structural masonry or block has been increasingly adopted in various constructions due to its economy and speed. The masonry or blocks used in this method are generally made of concrete or ceramics, with the latter offering significant advantages, especially in large-scale constructions. This study aimed to evaluate the applicability of the use of non-plastic raw material, in this case, the meta-limestone, in formulations processed with clay mass for the manufacture of ceramic structural blocks. There were made four formulations of ceramic mass with the use of kaolinitic clay and meta-limestone, aiming to verify and define the potential of this carbonate as a complementary raw material of the manufactured product that meets the specifications for the ceramic structural block. The additions of the meta-limestone in the ceramic mass were made in the fractions of 5%, 10%, 15% and 20%. The masses were prepared in a metal forming matrix dimensions 80mm x 10mm x 10mm, by pressing and sintered in a laboratory oven at temperatures of 850°C, 900°C, 950°C and 1000°C. These were characterized through granulometric analysis, chemical, mineralogical and thermogravimetric analysis. There were evaluated the technological properties of linear shrinkage, water absorption, apparent porosity, apparent specific mass and bending tensile strength. The best results were observed in the specimens with the incorporation of 5% of meta-limestone in the clayey mass and fired at a temperature of 900 ºC, obtaining an average maximum mechanical strength of 8.89 Mpa, and in some cases there was a considerable improvement in the technological aspects of the final product, providing an alternative for the ceramic industry, in addition to becoming a solution to minimize the environmental impacts of the region.