Comportamento de material de reciclagem profunda de pavimento estabilizado com nata de cimento

Abstract

Removing an old pavement generates a large amount of material, which can cause environmental impacts due to its improper disposal in the environment. The use of recycling pavement is increasing worldwide due to the advantages that this solution provides, such as the use of aggregates and binders of deteriorated pavement, possible reduce costs and energy consumption, and environmental preservation. One stabilizing agents commonly used in recycling pavement process is Portland cement, which generates a more rugged and durable surface. However, when applied to dry can cause problems, particularly threatening to people's health due to cement dust inhalation, thus becoming a restricted technique in urban areas. A solution to the problem of the dust generated is the use of cement slurry, reducing environmental impacts and avoiding damage to people's health. Therefore, the objective of this study is to evaluate the mechanical behavior of mixtures originating from full depth reclamation with the addition of cement slurry. In the first stage it was carried out to characterize the materials used in the study. After that, the unconfined compression strength UCS mixtures recycled to 5 cement content were obtained, obtaining a great content for recycled mixtures of 3.63% (70 kg/m³) in the dry mass. The average UCS found for the optimum mix was 3,19 MPa and the average value of the flexural tensile strength was 0,71 MPa. It was also verified for this mixture recycled the fatigue life and the resilience modules considering 3 strain relations applied (0,75; 0,60 and 0,45 of the breaking strain). The modules obtained were low (range 855 MPa to 126 MPa) compared to values found cemented materials. The results obtained are also the fatigue curve showed an R² regression coefficient of 0,9564.