Estabilização de solo fino com cal e cinza volante para uso em pavimento

Abstract

This work aims to study the stabilization of thin soils, this topic being of utmost importance for paving projects, showing a possible alternative that, if viable and approved according to the designers' criteria, could be a solution that makes it possible to use the local soil of the work, avoiding a soil movement and impacting the environment less. The work carried out the study of a fine soil and its stabilization with lime and fly ash for use as a pavement layer, evaluating whether the characteristics of the natural soil and the lime soil with fly ash additive are within the criteria established by the DNER (Departamento Nacional de Estradas de Rodagem), 4 test bodies were divided, SN (natural soil), SC5 (natural soil with 5% lime), SC7 (natural soil with 7% lime) and SC10 (natural soil with 10 % lime). According to the TRB classification system, the natural soil behaved as a subgrade layer from poor to poor and had a GI of 7.5, meaning it could not be used as a subbase layer. In the mechanical tests, the SN presented an ISC equal to 20% and an expansion of 0.53%, the SC5 with an ISC of 215% and an expansion of 0.03%, the SC7 with an ISC equal to 239% and an expansion of 0.04%, and SC10 presented an ISC of 256% and an expansion of 0.05%, all meeting the basic criteria for high traffic pavement, with an ISC greater than or equal to 80%, demonstrating that according to the increase in lime and fly ash, the SN, which could not be used as a pavement layer, now presents numbers that allow it to act as a high-resistance base layer, being able to withstand very heavy traffic, depending on other design criteria.