Comportamento mecânico de misturas solo, cal e RCD para uso em pavimentos

Abstract

Sustainability in engineering is a complex topic and through continuous debate. In the field of paving, higher quality of highways are demanded, as well as greater durability. For a soil mixed with lime, several factors influence its mechanical behavior: lime content, porosity, aging and moisture content. With the variables defined and analised, dosage methods can be established and adapted. In order to the applicability of a specific waste, to be adequate in the improvement of a soil, it is submitted to several mechanical tests, aiming at the minimum requirements. The goal is to study the stabilization of a tropical soil through addition of lime and its improvement through addition of construction and demolition waste. It was decided to study the variables that direct or indirectly effect the behavior of the natural soil of the Guabirotuba Geological Formation. The selected variables are: amount of lime, porosity, water content and aging. The characterization tests were: grain size, Atterberg limits, pH, speficic gravity and expansion index. The resistance tests are: unconfined compression test, diametral compression, California bearing ratio and resilient modulus. The addition of lime reduced the expansion index by 87.5%. The Resilient Modulus assays indicated that the soil-lime and soil-lime-CDW mixtures behave as clay-sand mixtures, and the results increased as the amount of lime and CDW increased. It was observed that, for pavement design, the following mixtures can be applied: intermediate and modified efforts of the 9% soil-lime mixture and soil-lime-CDW mixtures M1 and M2 for reinforcement of subgrade; modified effort of the soil-lime-CDW M1 mixture and intermediate and modified efforts of the soil-lime-CDW M2 mixture for subbase and modified effort of the soil-lime-CDW M2 mixture for base.