Avaliação da drenabilidade de pavimentos flexíveis no município de Barra do Garças-MT

Abstract

One of the most important parameters of road safety is the tire-pavement adhesion, which depends directly on the texture of the asphalt coating. The models proposed to estimate this texture can be used as auxiliary tools in the Pavement Management System (SGP), thus providing the opportune moment for interventions on the surface of the pavements in a way that guarantees the safety of the users. In this way, it is possible to anticipate and reduce the accident rate, because if there is early identification of points that show wear or accelerated polishing of the surface texture of the pavement, it is possible to adopt preventive maintenance activities. In order to verify the behavior of the coated surface in hot - rolled bituminous concrete (CBUQ) and double - skinned sealant (TSD) treatment, in the municipality of Barra do Garças - MT. To carry out the drainage test, determinations were made in 12 stations for each of the pavements, and in each station analyzes were performed both on the internal side and on the external side of the bearing range. When evaluating separately the internal and external track of the track, a variability was observed in the drainage capacity, a factor attributed mainly to the different frequencies of traffic of vehicles in some places of the track and to the execution of the coating layer. With the average flow data for each station of the two pavements evaluated together with the data of the test of sand stain obtained by Domingues (2018), it was possible to obtain an equation that relates the results of drainage with the texture of the pavement. When correlating this adjusted equation, with the intervals defined by Pasquet (1968), Coronel Elias Galvão Street, with CBUQ, presented a medium surface texture, indicated for roads with velocity in the range of 80 to 120 km / h and the TSD of President Kennedy Street, was classified as very coarse or very open, suitable for special cases that consist of areas with high risk of hydroplaning. Although they do not have ideal drainage values (macrotexture) according to the DNIT, the conditions of the runways evaluated do not pose a risk to the user's safety, since they are intended for urban traffic. After analyzing the results and verifying the consistency of the values obtained from the identity test applied to the model estimated in the present work, it was verified that the equipment developed has satisfactory capacity of measuring the macrotexture in coatings with bituminous concrete machined to the hot (CBUQ) and double surface treatment with sealant layer (TSD).