ESTUDO DO RESÍDUO DE CAULIM PEGMATÍTICO USADO COMO INGREDIENTE NA FORMULAÇÃO DE CIMENTO PORTLAND.

Portland cement is used mainly in the construction industry which is largely responsible for the consumption of non-renewable natural resources. The use of residues from mineral processing in the manufacture of cement, besides reducing environmental liabilities contributes to sustainability, producing eco-efficient cements. The residue of kaolin, coming from the companies located in the Pegmatitic Province of Borborema, is a clay composed of kaolinite (aluminosilicate) and other mineral components, which resembles the pozzolanic additive used in the manufacture of cement. The addition of pozzolan gives cement, among other properties, greater resistance to aggressive media such as sewage, sea water, sulfur soils and reactive aggregates. Studies with the kaolin residue were carried out on a laboratory scale, using grinding tests, X-ray fluorescence, compressive strength, among others. For the studies, 30% of the kaolin residue and 70% of a sample of base cement (CP V-ARI) were used, and the chemical results and mechanical resistance were compared with cures of 1, 3, 7 and 28 days. The results showed that the kaolin residue can at first partially replace the pozzolanic material used as pozzolan clay in the cement formulation. [ABSTRACT FROM AUTHOR]