Determinação de traço de concreto asfáltico usinado a quente com dosagem marshall para camada de rolamento de pequena espessura destinada a vias de tráfego leve de veículos

Abstract

The hot-machined bituminous concrete is the most used asphalt mixture in Brazil, and the determination of its fundamental project is to meet the technical and economic requirements to which it is designed. The toppest layer, which is composed by the hot asphaltic mix, has direct contact with the traffic, and must provide comfort, convenience and safety to the traffic, as well as impermeability and protection to the rest of the structure. The type of traffic is a determining factor for establish the thickness of the layer that must be compatible with the trace obtained, and the quality of the mixture depends on the materials used and the technological control applied, characterizing the components is critical to ensure a satisfactory road, knowledge of the materials, classify aggregates and define the binder content are essential and mandatory by standards to ensure the asphalt mass applicability standards. The present work performed the determination of a trace of hot-machined bituminous concrete for light traffic highways of vehicles to be executed with a thickness of 2.0 centimeters, following the specification of the DER/PR for paving with hot-machined bituminous concrete. It characterized the aggregate material by its particle size, density, specific mass and equivalent of sand, and the Marshall dosage method was used to determine the design content of the asphalt binder. The results obtained in the study followed the regulations surrounding the subject and were compatible with the parameters determined by standards, enabling the technical applicability of the project in the case.