Influência do resíduo do caulim tratado termicamente da região Amazônica e o seu potencial uso como material suplementar ao cimento Portland.

Abstract

Mineral industries produce waste in large quantities and in different types and levels of danger, such as the kaolin processing industry, which produces waste based on silica, mica and kaolinite. The disposal of this material in an inappropriate place causes a strong environmental impact, which could be minimized with the use of this waste as raw material for use in civil construction. This work aims to study the incorporation of calcined kaolin residues as a supplementary material to cement and concrete for use in civil construction. In this research, kaolin residues from the Felipe mine located in the south of Amapá were used, being carried out physical, chemical and mineralogical characterization tests, the pozzolanic activity index of the calcined residues at temperatures 500ºC, 700ºC and 900ºC, as well as the analysis heat, according to ABNT standards. For the mechanical technological tests (Simple compressive strength tests, modulus of deformation and tensile strength by diametral compression) and durability (Water absorption tests by immersion and water absorption test by capillarity), were incorporated with 0%, 10%, 15% and 20% of calcined kaolin waste, replacing part of the Portland cement. The results obtained showed that the calcined residues presented high pozzolanic activity at a temperature of 700ºC, the use of calcined kaolin residue presented mechanical behavior and durability as a supplementary material to cement and concrete within the ABNT norms, and finally we concluded that there is viability technique of using waste for use in civil construction as a supplementary material to cement, as well as use for high-strength concrete.