Incorporação de resíduos de caulim em argamassas de assentamento e revestimento para uso em construção civil - avaliação da atividade pozolânica.

Abstract

In recent years, issues related to environmental impact, caused by various sources polluters have been discussed throughout the world. Among them the great generation of urban and industrial waste. The waste from companies activities, in particular the milling of China clay, featuring intense training and accumulation of tailings. During the processing phase are generated two types of tailings, denominated in mining by "thick" and "thin". Which do not have a commercial value, and therefore are dropped by the companies indiscriminately in the environment. Aimed at environmental conservation, as well as reuse this residue, this work aims to assess the activity pozolânica residue and their incorporation in factory and coating for use in construction. Were used the residue "wholesale" and the residue "fine". As alternate material for making pozzolana mortar. The waste was characterized by determining particle size analysis, chemical composition, xray diffraction, differential thermal analysis and gravimetric. The same suffered calcination 600 °, 700 ° and 800°C and after this step given the pozolânica activity indices in accordance with the standards of the ABNT. Were made mortars containing proportions of 80% / 20%, 70% / 30%, 60% / 40% / 50% / 50% of waste "thick / thin. We studied the rate of pozzolanic activity of waste burnt at temperatures of 600 ° C, 700 ° C and 800 ° C for two hours, entered the mortar with proportions of RCF RCG and differentiated, with 80% RF RG +20%, 70% RG +30% RF, 60% RG +40% RF and 50% +50% RF RG. The results showed that residues of kaolin when calcined at temperatures above 700 º C has a high pozzolanic activity and mortar alternatives when incorporated with residue calcined kaolin have superior mechanical performance standards ASTM and ABNT.