Influência da energia térmica em propriedades mecânicas e físicas de agregados lateríticos utilizados em concreto betuminoso.

Abstract

This dissertation presents the results of a study developed with the objective of studying the influence of drying temperature on the resistance of five porous aggregates of lateritic origin in the Northeast region of Brazil. This study consisted of analyzing the results of crushing, abrasion "Los Angeles" and 10% fines tests. The variations that occurred with respect to absorption, the real and apparent specific gravity and the resistance of the studied lateritic aggregates were also verified, before and after being extracted from hot machined bituminous concrete in the laboratory by the Marshall method. The tests were carried out, with lateritic aggregates dried at room temperature, at 100º Cr 200º C and 350º C and after being extracted from hot machined bituminous concrete. The results obtained allowed us to conclude that, all researched aggregates increased their resistance when treated at different levels of thermal energy up to a certain temperature. From that temperature the resistance of the aggregates tends to decrease. Aggregates previously rejected by traditional standards pass after heat treatment to satisfy them. Finally, it is concluded that the lateritic aggregates extracted from bituminous concrete showed a reduction absorption, real specific mass, percentage of several, as well as greater resistance than that obtained with the aggregate in its natural state.