Avaliação da capacidade de suporte de um solo da região do Vale do Araguaia com adição de material fresado e cimento

Abstract

In virtue of the massive use of road mesh in Brazil, interventions to recover roads have become essential. Among the main methods, the recycling of pavements that have reached their limit of lifespan has become popular, because, not only does it reduce the project cost, but it is also considered sustainable pavement. This research sought to evaluate the effects of the inclusion of reclaimed asphalt pavement (RAP) and Portland cement in the bearing capacity of a soil in the Vale do Araguaia region. For that, characterization tests were made with the RAP, and with the soil collected. Posteriorly, compaction tests and determination of the California Bearing Ratio (CBR) were made out with chemically stabilished mixtures of soil with cement and RAP, and mixtures of soil only with RAP. The percentage of RAP added was of 20%, 30% and 40%, and the percentage of chemical stabilizer was fixed at 2%. Through the analyzes of the results, it was found that all mixtures with chemical stabilization, as well as the natural soil and the soil with cement addition met the DNIT criteria of CBR and expansion to be used in the base layers of a road pavement (CBR ≥ 80% and expansion ≤ 1%). For the soil mixtures without chemical stabilizer, the criteria of CBR and expansion for subbase layers were met (CBR ≥ 20% and expansion ≤ 1%). Among the mixtures without cement, the one containing 30% of RAP stood out, not only because met the criteria of CBR and expansion for subbases, but also for showing aptitude to be utilized in the base of road pavements, according to the CBR criteria (CBR superior or equal to 80%).