Avaliação do uso de escória de aciaria LD com diferentes emulsões asfálticas para microrrevestimento asfáltico a frio
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Data
2025-04-04
Autores
Scotá, Nadia Maria Drago
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Universidade Federal do Espírito Santo
Resumo
The asphalt coating undergoes aging due to the demands imposed by vehicle loads and weather conditions. Micro surfacing is a type of treatment available for the maintenance and preservation of pavements, as it reduces the evolution of defects, rehabilitates functional conditions, and increases the lifespan of the roadway. In search of alternative aggregates to meet the demand for natural aggregates, which also provide satisfactory performance for micro surfacing mixtures, the use of LD steel slag is evaluated, as it exhibits high mechanical resistance and adhesion with asphalt binders. Thus, the research aims to verify, through the evaluation of the mechanical behavior and performance of the mixtures, the feasibility of using LD steel aggregates compared to natural aggregates associated with two different asphalt emulsions in the production of micro surfacing mixtures. For this analysis, six mixtures were used, combining three aggregate compositions: 100% natural aggregate (type 1), 50% natural aggregate and 50% steel aggregate (type 2), and 100% steel aggregate (type 3) with two different asphalt emulsions designated A and B. The methodology is divided into three stages and is based on the national standard DNIT-ES 035/2018 and the international standard ISSA-A 143/2010. The first stage refers to the complete characterization of natural and steel aggregates, the second focuses on defining the granulometric composition of the three aggregate compositions, and the third presents the dosage study of the mixtures with the definition of emulsion content and evaluation of the behavior, compatibility, and performance of micro surfacing mixtures in the laboratory. In addition to the tests defined by the national standard, the compatibility characteristics of type B mixtures were evaluated through a more rigorous test called Schulze - Breuer and Ruck (ISSA TB 144/2019). All mixtures presented an optimal emulsion content lower than the minimum content. Overall, mixtures type 1, type 2, and type 3 showed satisfactory results and meet national usage specifications, with type 1 mixtures achieving the best results. Furthermore, regardless of the aggregate composition, the mixtures subjected to the Schulze - Breuer and Ruck test did not meet the minimum score required to be suitable for use in micro surfacing
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Microrrevestimento asfáltico a frio (MRAF) , Agregado natural , Escória de aciaria LD , Micro surfacing , Natural aggregate , LD steel slag , Pavimentos de asfalto , Escória (Metalurgia)