Estudo de campo e laboratório do comportamento mecânico de solo estabilizado com escória KR

Abstract

Road transport is the most used modal in Brazil, being essential the adequate sizing of the pavement structure and the control of its deformations. It is expected that this control starts in the laboratory stage with the characterization of the stiffness and resistance to permanent deformation of the materials used for the correct design using performance prediction models. Since the materials found in Espírito Santo have low strength, stabilization techniques are constantly used to improve the mechanical characteristics of these materials. Steel by-products have been increasingly used as alternative materials for soil stabilization. Thus, in this work, the mechanical behavior of the incorporation of KR (Kambara reactor) slag into a clayey material is studied. To achieve the objectives, laboratory tests of resilient modulus and permanent deformation were used in samples of pure soil and with the addition of KR for various curing periods (7, 14 and 28 days). Subsequently, field performance predictions were made using the new national mechanistic-empirical method (MeDiNa) and the results were compared to real data obtained in experimental tracks. It appears that the use of KR slag in clayey soil resulted in an increase in the resilient modulus, while longer curing times did not generate higher modulus values. The incorporation of KR increased the resistance to permanent deformation and the longer curing time resulted in a greater reduction in such deformations. Although the soil mixture with KR presents an increase in resilient modulus and permanent deformation resistance, the material tends to present an improved soil behavior, according to the models implemented in MeDiNa, and not a chemically stabilized material. The field results show that the solution meets the wheel track rutting design criteria, while in the method the values are very close to these limits, being a viable option for use in pavements.