Estabilização química de solos para fins rodoviários

Abstract

The construction of sub-layers of pavements with the predominance of granular materials is what recommends the norms of road construction. However, the scarcity of stone aggregates in some regions, in the case of Manaus (AM), makes their use unfeasible from the economic point of view. Therefore, there is a need to search for new materials that can replace the stone aggregates in this kind of structure. In order to solve this type of problem, Civil Engineering uses, in particular in the construction of pavements, the so-called soil stabilization. In the present work chemical stabilization of a clay soil from the Puraquequara branch, located between Manaus and Rio Preto da Eva, is studied with the individual participation of the chemical additives ECOLOPAVI®, EMC²® and TERRAZYME®, as well as the MacGrid geogrid ® NET. Natural material and compositions were characterized according to physical, chemical, mineralogical and mechanical tests for cure times of 3 (three), 7 (seven) and 28 (twenty-eight days). The results showed the natural material as a clay soil, classified as A-4 and CL. The mineralogical characterization, through Fluorescence and X-Ray Diffraction, identified the natural soil with high content of aluminum oxide (36.5%) and silicon dioxide (57.2%). By means of the XRD, it was also possible to verify the presence of kaolinite and quartz. In accordance with the results of Tensile Strength by Diametral Compression, the composition, with the presence of ECOLOPAVI®, indicated the best values relative to the natural soil and other formulations. According to data from Unconfined Compression Testing, the compositions with the participation of the additives ECOLOPAVI® and TERRAZYME® obtained the best results. Regarding the UCT, using the MacGrid® NET geogrid and the ECOLOPAVI® product, a considerable increase of this parameter was observed for the cure time of 3 (three) days.