Efeitos de altas temperaturas em concretos asfálticos de pavimentos

Abstract

In Brazil, flexible paving is more used. Often acts of manifestation which causes the closing of streets, avenues and highways. Groups moved by recurrent dissatisfaction with public policy actions manifests the discontent collective, firing on combustible material to stop the flow of vehicles seeking greater visibility of the causes defended. This work had as proposal the analysis of the effects of high temperatures on asphalt pavement concrete when subjected to fires. Laboratory studies were carried out to characterize the aggregates and binder used. In order to obtain the asphalt mass specimens, the Marshall dosage assays were developed to determine the optimal binder content for the granulometric range used. The subjection of the specimens to high temperatures was carried out by means of controlled fire conducted in partnership with Operations Center and Fire Technology (COTI) of the Military Fire Brigade of the State of Goiás, Brazil. (CBMGO). The burning times were defined together with the COTI, being 5, 10, 15 and 20 minutes. After the firing experiment, the mechanic tests to obtain values for stability and fluency for purposes of comparison with which those were not subjected to the fire. The results obtained showed that all specimens subjected to high temperatures lost resistance to stability and obtained increased fluency. It was also observed a process of disintegration of the bituminous material. It was observed that the longer the exposure time to fire, the greater the negative effects of loss of stability and creep increase.