Análise do comportamento mecânico de um pavimento rodoviário com variações dos materiais da camada de sub-base

Abstract

Pavement research and analysis are crucial to making it feasible to use local materials, such as soil, in road construction. In the study carried out at the UFMT Campus in Várzea Grande, the soil was evaluated in its natural condition and after various improvements. The aim of this research is to analyze the mechanical behavior of pavements with different materials in the subbase layer, keeping the load uniform and the layers fixed. Following a methodology in line with technical standards, the physical and mechanical properties of the materials were evaluated. This analysis is fundamental to understanding the behavior and interaction of these materials under various conditions, such as load, humidity and temperature, in order to ensure the consistency of the results obtained. The tests revealed that soils with 20%, 35% or 50% waste are not suitable for the sub-base in real projects due to their low CBR values, but the soil with 20% waste was considered for analysis due to its CBR being closer to the required one. However, the soil improved with 2.5% lime showed promising results, while the soil with 4.5% cement was qualified for the base layer due to its satisfactory CBR values. The design of the pavements showed the importance of considering the mechanical properties of the materials for efficient performance. In this way, the various scenarios highlighted the impact of the CBR values on the layer thicknesses, showing that the best solution resulted from using a soil mixture with 4.5% cement.