Estudo de viabilidade técnica da utilização do resíduo de caulim em blocos de vedação.

Abstract

The extraction of minerals non metallic in the State of Paraiba was classified by the Superintendency of Administration of the environment as the second largest generating activity of industrial solid residues in the state. This research was accomplished with the objective principal of characterizing the residue generated by the companies of kaolin improvement with relationship to your physical and mineralogical characteristics, with relationship to the risks to the environment and to also study the technical viability of the use of this residue in the production of fencing blocks without structural function. The residue was classified according to ABNT NBR-10004/04'S norm as II-TO, material non inert, needing embankments for the fact of possessing cadmium and manganese in amounts above specified by the norm. The physical characterization was accomplished through the rehearsals: apparent specific mass and grain size distribution, the mineralogical characterization for the X ray diffraction, thermal analyses (ATD and ATG) and chemical analysis. For the technological rehearsals of resistance to the compression and absorption of water were moulded blocks with dimensions of 9x19x39cm, in the line 1:6 with residue incorporation in the proportions of 40, 70 and 100% in relation to the small aggregate. After the analysis of the results, it was verified that the blocks us which 40 and 70% of residue were used in substitution to the sand, they presented inside to the 28 days of cure values of the established limits for the norm ABNT NBR-7171/92, being it of 70% the more recommended by the fact of using larger amount of residue. The residue volume generated monthly it allows the monthly production of 2.000.000 of blocks, enough to build 1.000 houses of social interest.