Estudo de solos modificados por adição de polímeros para uso em pavimentos rodoviários.

Abstract

On highways, the soil is used as support material and compose the pavements layers. For this, should have characteristics that confer stability and mechanical strength when submitted traffic forces over its useful life. Stabilization techniques are usually used when local soil does not answer construction and performance specifications, enabling technically and economically materials before discarded. Polymeric soil stabilization, unlike others technique (granulometric and chemical), can be effective in gravel soils as clay soils. Based on this assumption, this study aimed to evaluate the efficacy of polymer association in soil stabilization that can be used in roads pavements. The experimental procedure was divided in three stages: physical-chemical-mineralogy properties (granulometry, specific mass, Atterberg limits, chemical analyses-EDX, X-ray diffraction – DRX, scanning electron micrographs and methylene blue), mechanical properties (California Bearing Ratio –CBR, Unconfined Compressive Strength – UCS, Indirect Tensile Strength, Resilient Modulus –RM) and deterioration test (Loaded Wheel Test – LWT and Wet Abrasion Test Track). It was used four(4) different soils with addition of polymer combination in amounts of 2,2%, 6,4% and 10,7% using as reference samples of pure soil and added common additives (lime and cement). Based on the obtained results, can be inferred that the polymer association with soil provided an increase of the mechanical properties (CBR,UCS, Indirect Tensile strength and MR) and reducing degradation measured by LWT and WTAT. Altogether , the polymeric association was effective in stabilizing studied soils, being an efficient technique for use in pavements layers of roads that can be submitted to light and/or heavy traffic.